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Oldal 1/108
Analogue Redbox
User Handbook
RB-MA1 Single microphone amplifier
RB-MA2 Dual microphone amplifier
RB-SM1 Single stereo to mono converter
RB-SM2 Dual stereo to mono converter
RB-UL1 Single unbalanced to balanced converter
RB-UL2 Dual unbalanced to balanced converter
RB-UL4 Quad unbalanced to balanced converter
RB-LU4 Quad balanced to balanced converter
RB-BL2 Single stereo bi-directional matching converter
RB-BL4 Dual stereo bi-directional matching converter
RB-SL2 Twin mono, or stereo, limiter
RB-DA6 6 way stereo distribution amplifier
RB-HD1 Stereo headphone amplifier
RB-HD6 6 way stereo headphone distribution amplifier
RB-SD1 Silence detection unit
RB-PMX4 10 input, 4 output preset mixer
RB-LI2 Stereo line isolation unit
RB-PLI6 6 way mono passive line isolation unit
RB-SS10 10 way stereo source selector/mixer
RB-LC3 3 way light/power controller
Revision 1.92 June, 2004
©
©
©
©©Sonifex Ltd, 2000-4.
All Rights Reserved
Sonifex Ltd, 61, Station Road, Irthlingborough,
Northants, NN9 5QE, England.
Tel : +44 (0)1933 650 700
Fax : +44 (0)1933 650 726
Email : sales@sonifex.co.uk or technical.support@sonifex.co.uk
Web : http://www.sonifex.co.uk
Information in this document is subject to change without notice and does not
represent a commitment on the part of Sonifex Ltd. Sonifex Ltd shall not be liable for
any loss or damage whatsoever arising form the use of information or any error
contained in this manual.
No part of this manual may be reproduced or transmitted in any form or by any
means, electronic or mechanical, including photocopying, recording, or information
storage and retrieval systems, for any purpose other than the purchaser's personal
use, without the express written permission of Sonifex Ltd.
Unless otherwise noted, all names of companies, products and persons contained
herein are part of a completely fictitious adaptation and are designed solely to
document the use of Sonifex products.
Contents
Redbox User Handbook
Contents
Warranty, Safety & Installation Information....................... i
Warranty Information ..........................................................i
Returning the Warranty Card ............................................... ii
Safety of Mains Operated Redbox Equipment ........................ iii
Preparing the Machine for Use .......................................... iii
Equipment Safety ........................................................... iii
Voltage Setting Checks.................................................... iii
Fuse Rating ................................................................... iii
Power Cable and Connection ............................................ iii
Ordering the Correct Mains Lead....................................... iv
Installation Information...................................................... iv
Atmosphere................................................................... iv
Electromagnetic Radiation................................................ iv
Fitting Redboxes..............................................................v
1. RB-MA1 Single & RB-MA2 Dual Microphone Amplifiers 1-1
1.1. Introduction.............................................................1-1
1.2. System Block Diagram...............................................1-2
1.3. Rear Panel Connections and Operation .........................1-2
1.3.1. Mic Inputs ..........................................................1-3
1.3.2. Input Gain..........................................................1-3
1.3.3. Using Phantom Powered Microphones.....................1-3
1.3.4. Using the LF Filter ...............................................1-3
1.3.5. Output...............................................................1-3
1.4. Technical Specifications .............................................1-4
1.4.1. Audio Specifications .............................................1-4
1.4.2. Connections........................................................1-4
1.4.3. Equipment Type ..................................................1-4
1.4.4. Physical Specifications..........................................1-4
2. RB-SM1 Single & RB-SM2 Dual Stereo To Mono Converter
…….............................................................................. 2-1
2.1. Introduction.............................................................2-1
2.2. System Block Diagram...............................................2-2
2.3. Rear Panel Connections and Operation .........................2-2
2.3.1. Stereo Inputs 1 (& 2)...........................................2-3
2.3.2. Mono Output 1 (& 2)............................................2-3
2.3.3. Output Gain........................................................2-3
2.4. Technical Specifications .............................................2-4
2.4.1. Audio Specifications .............................................2-4
Contents
Redbox User Handbook
2.4.2. Connections ....................................................... 2-4
2.4.3. Equipment Type..................................................2-4
2.4.4. Physical Specifications .........................................2-4
3. RB-UL1 Single, RB-UL2 Dual & RB-UL4 Quad Stereo
Unbalanced To Balanced Converters ........................... 3-1
3.1 Introduction..............................................................3-1
3.2 System Block Diagram ...............................................3-2
3.3 Rear Panel Connections and Operation.......................... 3-2
3.3.1. RCA Phono Inputs (Left and Right) ........................3-3
3.3.2. Outputs (Left and Right) ...................................... 3-3
3.3.3. Output Level Adjustment......................................3-3
3.4 Technical Specifications .............................................. 3-4
3.4.1. Audio Specifications.............................................3-4
3.4.2. Connections ....................................................... 3-4
3.4.3. Equipment Type..................................................3-4
3.4.4. Physical Specifications .........................................3-4
4. RB-LU4 Quad Stereo Balanced To Unbalanced Converter
…….............................................................................. 4-1
4.1. Introduction.............................................................4-1
4.2. System Block Diagram ..............................................4-2
4.3. Rear Panel Connections and Operation.........................4-3
4.3.1. Inputs 1-4 (Left and Right) ..............................4-3
4.3.2. RCA Phono Outputs 1-4 (Left and Right) ............ 4-3
4.3.3. Output Level Adjustment .................................4-3
4.4. Technical Specifications ............................................. 4-4
4.4.1. Audio Specifications ........................................4-4
4.4.2. Connections................................................... 4-4
4.4.3. Equipment Type ............................................. 4-4
4.4.4. Physical Specifications .....................................4-4
5. RB-BL2 Single & RB-BL4 Dual Bi-Directional Matching
Converter .................................................................... 5-1
5.1. Introduction.............................................................5-1
5.2. System Block Diagram ..............................................5-2
5.3. Rear Panel Connections and Operation .......................... 5-3
5.3.1. Balanced to Unbalanced Connections ..................... 5-4
5.3.2. Unbalanced to Balanced Connections ..................... 5-4
5.4. Technical Specifications ............................................. 5-5
5.4.1. Audio Specifications.............................................5-5
5.4.2. Connections ....................................................... 5-5
Contents
Redbox User Handbook
5.4.3. Equipment Type ..................................................5-5
5.4.4. Physical Specification ...........................................5-5
6. RB-SL2 Twin Mono, or Stereo, Limiter ......................... 6-1
6.1. Introduction .............................................................6-1
6.2. System Block Diagram...............................................6-2
6.3. Rear Panel Connections and Operation.........................6-3
6.3.1. Outputs .............................................................6-3
6.3.2. Inputs ...............................................................6-3
6.3.3. Gain ..................................................................6-3
6.3.4. Mode .................................................................6-3
6.4. Technical Specifications .............................................6-4
6.4.1. Audio Specifications.............................................6-4
6.4.2. Connections........................................................6-4
6.4.3. Equipment Type ..................................................6-4
6.4.4. Physical Specifications..........................................6-4
7. RB-DA6 6 Way Stereo Distribution Amplifier............... 7-1
7.1. Introduction .............................................................7-1
7.2. System Block Diagram...............................................7-2
7.3. Rear Panel Connections and Operation.........................7-3
7.3.1. Inputs (Left and Right).........................................7-3
7.3.2. Stereo Outputs 1-6 (Mono Outputs 1-12)................7-3
7.4. Front Panel Connections and Controls ...........................7-3
7.4.1. Input Gain Control...............................................7-3
7.4.2. Stereo/Mono Operation ........................................7-4
7.5. Technical Specifications .............................................7-4
7.5.1. Audio Specifications.............................................7-4
7.5.2. Connections........................................................7-4
7.5.3. Equipment Type ..................................................7-4
7.5.4. Physical Specifications..........................................7-4
8. RB-HD1 Stereo Headphone Amplifier ..........................8-1
8.1. Introduction .............................................................8-1
8.2. System Block Diagram...............................................8-2
8.3. Front Panel Connections and Controls ..........................8-2
8.3.1. Stereo Outputs 1-2 (Mono Outputs1-2) ..................8-2
8.3.2. Volume Level Control...........................................8-2
8.4. Rear Panel Connections and Operation.........................8-3
8.4.1. Stereo Input (Left and Right) ................................8-3
8.4.2. Mono Mix Input...................................................8-3
8.4.3. Stereo/Mono Operation ........................................8-3
Contents
Redbox User Handbook
8.4.4. Local/Remote Control Operation ............................8-3
8.4.5. Remote Connector............................................... 8-4
8.5. Technical Specifications ............................................. 8-4
8.5.1. Audio Specifications............................................. 8-4
8.5.2. Connections ....................................................... 8-4
8.5.3. Equipment Type..................................................8-4
8.5.4. Physical Specifications .........................................8-4
9. RB-HD6 6 Way Stereo Headphone Distribution Amplifier
…….............................................................................. 9-1
9.1. Introduction.............................................................9-1
9.2. System Block Diagram ..............................................9-2
9.3. Rear Panel Connections and Operation.........................9-3
9.3.1. Stereo Input (Left and Right)................................9-3
9.3.2. Stereo/Mono Operation ........................................9-3
9.3.3. Channel Insertion Inputs or Parallel Outputs ...........9-3
9.4. Front Panel Connections and Controls .......................... 9-5
9.4.1. Stereo Outputs 1-6 (Mono Outputs 1-6) .................9-5
9.4.2. Master Level Control............................................ 9-5
9.4.3. Channel Volume Controls ..................................... 9-5
9.5. Technical Specifications ............................................. 9-6
9.5.1. Audio Specifications............................................. 9-6
9.5.2. Connections ....................................................... 9-6
9.5.3. Equipment Type..................................................9-6
9.5.4. Physical Specifications .........................................9-6
10. RB-SD1 Silence Detection Unit ................................ 10-1
10.1. Introduction ......................................................... 10-1
10.2. System Block Diagram........................................... 10-2
10.3. Rear Panel Connections and Operation....................... 10-3
10.3.1. A/B Inputs (Left and Right).............................. 10-3
10.3.2. Outputs ......................................................... 10-3
10.3.3. Level Control .................................................. 10-3
10.3.4. Time Control................................................... 10-3
10.3.5. Mode Dip Switch Settings ................................. 10-4
10.3.6. Remotes Connector ......................................... 10-5
10.4. Front Panel Selectors and Indicators.......................... 10-6
10.4.1. Source Select and Indicator .............................. 10-6
10.4.2. Mode Selector and Indicator.............................. 10-6
10.4.3. Main and Aux indicators ................................... 10-7
10.4.4. Alarm Indicator ............................................... 10-7
Contents
Redbox User Handbook
10.4.5. Restore Button ................................................ 10-7
10.4.6. Additional Modes ............................................. 10-7
10.5. Technical Specifications ......................................... 10-9
10.5.1. Audio Specifications ......................................... 10-9
10.5.2. Connections and Rear Panel Controls.................. 10-9
10.5.3. Front Panel Controls and Indicators .................... 10-9
10.5.4. Equipment Type .............................................. 10-9
10.5.5. Physical Specifications...................................... 10-9
11. RB-PMX4 10 Input, 4 Output Analogue Preset Mixer11-1
11.1. Introduction ......................................................... 11-1
11.2. System Block Diagram........................................... 11-2
11.3. Rear Panel Connections and Operation ..................... 11-3
11.3.1. Inputs 1-10 .................................................... 11-3
11.3.2. Outputs 1-4 .................................................... 11-3
11.4. Front Panel Controls .............................................. 11-3
11.4.1. Switch Banks .................................................. 11-3
11.4.2. Input Gain Controls.......................................... 11-4
11.5. Technical Specifications ......................................... 11-4
11.5.1. Audio Specifications ......................................... 11-4
11.5.2. Connections.................................................... 11-4
11.5.3. Equipment Type .............................................. 11-4
11.5.4. Physical Specifications...................................... 11-4
12. RB-LI2 Stereo Line Isolation Unit............................ 12-1
12.1. Introduction ......................................................... 12-1
12.2. System Block Diagram........................................... 12-1
12.3. Rear Panel Connections and Operation ..................... 12-2
12.3.1. Inputs............................................................ 12-2
12.3.2. Isolated Outputs.............................................. 12-2
12.3.3. Loop Outputs .................................................. 12-2
12.3.4. Output Level Adjustment .................................. 12-3
12.3.5. Internal Jumpers ............................................. 12-3
12.4. Technical Specifications ......................................... 12-4
12.4.1. Audio Specification .......................................... 12-4
12.4.2. Connections.................................................... 12-4
12.4.3. Equipment Type .............................................. 12-4
12.4.4. Physical Specifications...................................... 12-4
13. RB-PLI6 6 Way Mono Passive Line Isolation Unit .... 13-1
13.1. Introduction ......................................................... 13-1
13.2. System Block Diagram........................................... 13-1
Contents
Redbox User Handbook
13.3. Rear Panel Connections and Operation ..................... 13-2
13.3.1. Inputs............................................................ 13-2
13.3.2. Outputs ......................................................... 13-2
13.3.3. Ground-link Internal Jumpers............................ 13-3
13.4. Technical Specifications ......................................... 13-4
13.4.1. Audio Specification .......................................... 13-4
13.4.2. Connections.................................................... 13-4
13.4.3. Equipment Type .............................................. 13-4
13.4.4. Physical Specifications...................................... 13-4
14. RB-SS10 10 Way Stereo Analogue Source Selector/Mixer
……............................................................................ 14-1
14.1. Introduction........................................................... 14-1
14.2. System Block Diagram........................................... 14-2
14.3. Front Panel Indicators & Controls ............................ 14-3
14.3.1. Illuminated Push Buttons.................................. 14-3
14.3.2. Front Panel Gain Controls ................................. 14-3
14.3.3. Headphone Output .......................................... 14-3
14.3.4. Volume Control ............................................... 14-3
14.4. Rear Panel Connections and Operation ..................... 14-4
14.4.1. Inputs............................................................ 14-4
14.4.2. Outputs ......................................................... 14-4
14.4.3. Altering the Master Output Level........................ 14-4
14.4.4. RB-SS10 Additional Audio Input Connectors ........ 14-5
14.4.5. RB-SS10 Remote Start I/O ............................... 14-6
14.4.6. Remote Select/Switch Inputs ............................ 14-7
14.4.7. Status Outputs................................................ 14-7
14.5. Technical Specifications ......................................... 14-9
14.5.1. Audio Specifications ......................................... 14-9
14.5.2. Connections.................................................... 14-9
14.5.3. Equipment Type .............................................. 14-9
14.5.4. Physical Specifications...................................... 14-9
15. RB-LC3 3 Way Light/Power Controller .................... 15-1
15.1. Introduction ......................................................... 15-1
15.2. System Block Diagram........................................... 15-2
15.3. Rear Panel Connections and Operation ..................... 15-3
15.3.1. Switched Mains Outputs ................................... 15-3
15.3.2. Telephone Connections..................................... 15-3
15.3.3. Remote External Control Inputs......................... 15-3
15.3.4. Configuration Switches..................................... 15-4
Contents
Redbox User Handbook
15.3.5. Flash Rate Preset Potentiometer ........................ 15-6
15.4. Technical Specifications ......................................... 15-7
15.4.1. Connections.................................................... 15-7
15.4.2. Equipment Type .............................................. 15-7
15.4.3. Physical Specifications...................................... 15-7
16. Glossary .................................................................. 16-1
17. Connectors And Cabling ........................................17-1
17.1. XLR 3 Pin Connectors.......................................... 17-1
17.2. RCA Phono Connectors........................................ 17-1
17.3. ¼” Jack Connector ............................................. 17-2
17.4. D-Type Connector .............................................. 17-2
Index ……......................................................................... I-1
Contents
Redbox User Handbook
Figures
Fig W-1: Mains Lead Table ................................................. iv
Fig W-2: RB-RK1(B) Small Redbox Front Rack-mount Kit ......... v
Fig W-3: RB-RK2 Small Redbox Rear Rack-mount Kit .............. v
Fig W-4: RB-RK3 Large Redbox Rear Rack-mount Kit .............. v
Fig 1-1: RB-MA1 & RB-MA2 Front Panel.............................. 1-1
Fig 1-2: RB-MA1 & RB-MA2 Block Diagram Single Channel .... 1-2
Fig 1-3: RB-MA1 Rear Panel..............................................1-2
Fig 1-4: RB-MA2 Rear Panel..............................................1-2
Fig 2-1: RB-SM1 & RB-SM2 Front Panel..............................2-1
Fig 2-2: RB-SM1 & RB-SM2 Block Diagram Single Channel .... 2-2
Fig 2-3: RB-SM1 Rear Panel..............................................2-2
Fig 2-4: RB-SM2 Rear Panel..............................................2-2
Fig 3-1: RB-UL1 & RB-UL2 Front Panel ...............................3-1
Fig 3-2: RB-UL4 Front Panel ............................................. 3-1
Fig 3-3: RB-UL1 Block Diagram For a Single Channel ...........3-2
Fig 3-4: RB-UL1 Rear Panel ..............................................3-2
Fig 3-5: RB-UL2 Rear Panel ..............................................3-2
Fig 3-6: RB-UL4 Rear Panel ..............................................3-3
Fig 4-1: RB-LU4 Front Panel ............................................. 4-1
Fig 4-2: RB-LU4 Block Diagram......................................... 4-2
Fig 4-3: RB-LU4 Rear Panel ..............................................4-3
Fig 5-1: RB-BL2 Front Panel .............................................5-1
Fig 5-2: RB-BL4 Front Panel .............................................5-1
Fig 5-3: RB-BL2 Block Diagram Single Stereo Channel.......... 5-2
Fig 5-4: RB-BL2 Rear Panel ..............................................5-3
Fig 5-5: RB-BL4 Rear Panel ..............................................5-3
Fig 6-1: RB-SL2 Front Panel .............................................6-1
Fig 6-2: RB-SL2 Block Diagram ......................................... 6-2
Fig 6-3: RB-SL2 Rear Panel .............................................. 6-3
Fig 7-1: RB-DA6 Front Panel.............................................7-1
Fig 7-2: RB-DA6 Block Diagram ........................................ 7-2
Fig 7-3: RB-DA6 Rear Panel..............................................7-3
Fig 7-4: RB-DA6 Front Panel.............................................7-3
Fig 8-1: RB-HD1 Front Panel.............................................8-1
Fig 8-2: RB-HD1 Block Diagram ........................................8-2
Fig 8-3: RB-HD1 Front Panel.............................................8-2
Fig 8-4: RB-HD1 Rear Panel..............................................8-3
Fig 8-5 RB-HD1 Remote Connector .................................... 8-4
Contents
Redbox User Handbook
Fig 9-1: RB-HD6 Front Panel.............................................9-1
Fig 9-2: RB-HD6 Block Diagram ........................................9-2
Fig 9-3: RB-HD6 Rear Panel..............................................9-3
Fig 9-4: RB-HD6 Front Panel.............................................9-5
Fig 10-1: RB-SD1 Front Panel ......................................... 10-1
Fig 10-2: RB-SD1 Block Diagram..................................... 10-2
Fig 10-3: RB-SD1 Rear Panel .......................................... 10-3
Fig 10-4: RB-SD1 Front Panel ......................................... 10-6
Fig 11-1: RB-PMX4 Front Panel ....................................... 11-1
Fig 11-2: RB-PMX4 Block Diagram ................................... 11-2
Fig 11-3: RB-PMX4 Rear Panel ........................................ 11-3
Fig 11-4: RB-PMX4 Front Panel Controls ........................... 11-3
Fig 12-1: RB-LI2 Front Panel........................................... 12-1
Fig 12-2: RB-LI2 System Block Diagram........................... 12-1
Fig 12-3: RB-LI2 Rear Panel .......................................... 12-2
Fig 12-4: Jumper Positions on the RB-LI2 PCB................... 12-3
Fig 13-1: RB-PLI6 Front Panel......................................... 13-1
Fig 13-2: RB-PLI6 System Block Diagram ......................... 13-1
Fig 13-3: RB-PLI6 Rear Panel.......................................... 13-2
Fig 13-4: RB-PLI6 Ground-link Jumper Settings ................. 13-3
Fig 14-1: RB-SS10 Front Panel........................................ 14-1
Fig 14-2: RB-SS10 System Block Diagram ........................ 14-2
Fig 14-3: RB-SS10 Front Panel........................................ 14-3
Fig 14-4 : RB-SS10 Rear Panel........................................ 14-4
Fig 14-5: Analogue Audio Inputs Pin Connections............... 14-5
Fig 14-6: Remote Start Pin Connections ........................... 14-6
Fig 14-7: Connection Example ........................................ 14-6
Fig 14-8: Remote Select/Switch Input Connections ............ 14-7
Fig 14-9: Connection Example ........................................ 14-7
Fig 14-10: Status Output Pin Connections......................... 14-8
Fig 14-11: Connection Example....................................... 14-8
Fig 15-1: RB-LC3 Front Panel.......................................... 15-1
Fig 15-2: RB-LC3 Block Diagram ..................................... 15-2
Fig 15-3: RB-LC3 Rear Panel........................................... 15-3
Fig 15-4: Output 1 Configuration Setting .......................... 15-4
Fig 15-5: Output 2 Configuration Settings......................... 15-5
Fig 15-6: Output 3 Configuration Settings......................... 15-6
Fig 17-1 : XLR Connectors.............................................. 17-1
Fig 17-2 : RCA Phono Connector ..................................... 17-1
Contents
Redbox User Handbook
Fig 17-3 : ¼” Jack Connector.......................................... 17-2
Fig 17-4 : 25 Way D-Type Connectors.............................. 17-2
Fig 17-5 : 15 Way D-Type Connectors.............................. 17-2
Warranty, Safety & Installation Information
Redbox User Handbook i
Warranty, Safety & Installation Information
Warranty Information
Warranty and Liability - important the purchaser is advised to read this
clause.
(a) The Company agrees to repair or (at its discretion) replace Goods which are found
to be defective (fair wear and tear excepted) and which are returned to the Company
within 12 months of the date of despatch provided that each of the following are
satisfied:
(i) Notification of any defect is given to the Company immediately upon its becoming
apparent to the Purchaser;
(ii) The Goods have only been operated under normal operating conditions and have
only been subject to normal use (and in particular the Goods must have been
correctly connected and must not have been subject to high voltage or to ionising
radiation and must not have been used contrary to the Company's technical
recommendations);
(iii) The Goods are returned to the Company's premises at the Purchaser's expense;
(iv) Any Goods or parts of Goods replaced shall become the property of the Company;
(v) No work whatsoever (other than normal and proper maintenance) has been
carried out to the Goods or any part of the Goods without the Company's prior written
consent;
(vi) The defect has not arisen from a design made, furnished or specified by the
Purchaser;
(vii) The Goods have been assembled or incorporated into other goods only in
accordance with any instructions issued by the Company;
(viii) The defect has not arisen from a design modified by the Purchaser;
(ix) The defect has not arisen from an item manufactured by a person other than the
Company. In respect of any item manufactured by a person other than the Company,
the Purchaser shall only be entitled to the benefit of any warranty or guarantee
provided by such manufacturer to the Company.
(b) In respect of computer software supplied by the Company the Company does not
warrant that the use of the software will be uninterrupted or error free.
(c) The Company accepts liability:
(i) For death or personal injury to the extent that it results from the negligence of the
Company, it’s employees (whilst in the course of their employment) or its agents (in
the course of the agency);
(ii) For any breach by the Company of any statutory undertaking as to title, quiet
possession and freedom from encumbrance.
(d) Subject to conditions (a) and (c) from the time of despatch of the Goods from the
Company's premises the Purchaser shall be responsible for any defect in the Goods or
loss, damage, nuisance or interference whatsoever consequential economic or
otherwise or wastage of material resulting from or caused by or to the Goods. In
particular the Company shall not be liable for any loss of profits or other economic
losses. The Company accordingly excludes all liability for the same.
Warranty, Safety & Installation Information
ii Redbox User Handbook
(e) At the request and expense of the Purchaser the Company will test the Goods to
ascertain performance levels and provide a report of the results of that test.
The report will be accurate at the time of the test, to the best of the belief and
Knowledge of the Company, and the Company accepts no liability in respect of its
accuracy beyond that set out in Condition (a).
(f) Subject to Condition (e) no representation, condition, warranty or other term,
express or implied (by statute or otherwise) is given by the Company that the Goods
are of any particular quality or standard or will enable the Purchaser to attain any
particular performance or result, or will be suitable for any particular purpose or use
under specific conditions or will provide any particular capacity, notwithstanding that
the requirement for such performance, result or capacity or that such particular
purpose or conditions may have been known (or ought to have been known) to the
Company, its employees or agents.
(g)(i) To the extent that the Company is held legally liable to the Purchaser for any
single breach of contract, tort, representation or other act or default, the Company's
liability for the same shall not exceed the Price of the Goods.
(ii) The restriction of liability in Condition (g)(i) shall not apply to any liability
accepted by the Seller in Condition (c).
(h) Where the Goods are sold under a consumer transaction (as defined by the
Consumer Transactions (Restrictions on Statements) Order 1976) the statutory rights
of the Purchaser are not affected by these Conditions of Sale.
Returning the Warranty Card
In order to register the date of purchase so that we can keep you informed of any
design improvements or modifications, it is important to complete the warranty
registration document that is enclosed and return it to Sonifex Ltd in the UK.
For your own records you should write down the type of machine and the serial
number (which can be found on the rear panel of the Redbox).
Redbox Type
RB-……………………………………
Serial Number
RB………………………………………
Warranty, Safety & Installation Information
Redbox User Handbook iii
Safety of Mains Operated Redbox Equipment
Preparing the Machine for Use
Each Redbox is shipped in protective packaging and should be inspected for damage
before use. Where an item is found to have transit damage, notify your supplier
immediately with all the relevant details of the shipment. Packing materials should be
kept for inspection.
Equipment Safety
This equipment has been designed to meet the safety regulations currently advised in
the country of purchase.
The power cable supplied carries an EARTH conductor, which is connected internally to
the equipment chassis ground. This connection through a properly wired power
connector is essential for safe operation. Disconnection of this earth connection may
render the equipment unsafe, with a consequential possible electrical shock hazard
from exposed metallic parts.
This equipment will operate in a horizontal position and conforms to the
safety regulations specified by use of the CE Mark.
Warning: There are no user serviceably parts inside the machine. If you
should ever need to look inside the unit, always disconnect the mains supply
before removing the equipment covers.
Voltage Setting Checks
Ensure that the machine operating voltage is correct for your mains power supply by
checking the box in which your Redbox was supplied. The voltage is shown on the box
label. The available voltage settings are 115V, or 230V. Please note that the majority
of the Redboxes are switchable between 115V and 230V.
Fuse Rating
The Redboxes are supplied with a single fuse in the live conducting path of the power
infeed at the power supply. For reasons of safety it is important that the correct rating
and type of fuse is used. Incorrectly rated fuses could present a possible fire hazard,
under equipment fault conditions. The fuse ratings for the Redboxes are: -
Voltage Fuse
115 V 200mA, 5 x 20mm SB
230 V 100mA, 5 x 20mm SB
Power Cable and Connection
An IEC power connector is supplied with the Redbox, which has a moulded plug,
attached – this is a legal requirement. If no moulded plug has been supplied with
Warranty, Safety & Installation Information
iv Redbox User Handbook
Your Redbox, please contact your supplier, because an IEC connector is always
supplied from the Sonifex factory. If for any reason, you need to use the Redbox with
a different power cable, you should use the following wiring guidelines:
Wire Colour Connection
Green, or green and yellow Earth (E)
Blue, or Black Neutral (N)
Brown, or Red Live (L)
Ordering the Correct Mains Lead
When ordering a Redbox from Sonifex, it is helpful if you can specify your required
operating voltage and mains lead. After the product code add:
UK, for 230V, UK 3 pin to IEC lead
EC, for 230V, European Schuko 2 pin to IEC lead
US, for 115V, 3 pin to IEC lead
AU for 230V, Australasian 3 pin to IEC lead
Fig W-1: Mains Lead Table
E.g. order RB-BL2 UK for a UK IEC lead to be supplied.
Installation Information
Atmosphere
The units should be installed in an area that is not subject to excessive temperature
variation (<0°C, >50°C), moisture, dust or vibration.
Electromagnetic Radiation
The cover is connected to earth by means of the fixing screws. It is essential to
maintain this earth ground connection to ensure a safe operating environment and
provide electromagnetic shielding.
Please note that due to the large gain range of the RB-MA1/MA2 microphone
amplifiers, there can be a degradation of the audio signal if used near to sources of
intense electromagnetic radiation (e.g. video monitors and power cables).
Warranty, Safety & Installation Information
Redbox User Handbook v
Fitting Redboxes
Redboxes can be fixed to the underside of a mixing desk, or other surfaces using 2 off
No. 6 countersink screws.
They can also be rack-mounted, with either the front, or rear of the Redbox
positioned at the front of the rack:
Front Mounting Redboxes: For rack mounting smaller (28cm) units the optional
RB-RK1 (Red) or RB-RK1B (Black) kit can be used (which include 4 off M6 panel
fixing screws).
Fig W-2: RB-RK1(B) Small Redbox Front Rack-mount Kit
Rear Mounting Redboxes: For rear panel mounting you can use either the RB-RK2,
or RB-RK3, depending on the size of your Redbox.
RB-RK2 1U rear panel rack kit for small Redbox range, e.g., RB-BL2
Fig W-3: RB-RK2 Small Redbox Rear Rack-mount Kit
e.g. for fitting an RB-BL2:
RB-RK3 1U rear panel rack kit for large Redbox range, e.g., RB-DA6
Fig W-4: RB-RK3 Large Redbox Rear Rack-mount Kit
e.g. for fitting an RB-DA6:
Warranty, Safety & Installation Information
vi Redbox User Handbook
Wherever you see this symbol an RB-RK1 front panel rack kit can be used :
Wherever you see this symbol an RB-RK2 small Redbox rear panel 19” rack kit can be
used :
Wherever you see this symbol an RB-RK3 large Redbox rear panel 19” rack kit can be
used :
Note: When fitting the rear-mounting rack-kits, a notch has been left on the
inside of the right-hand rack-piece for the mains cable to pass through. Make
sure that the mains cable has been put through the notch before attaching
the right hand rack-piece.
Chapter 1 - RB-MA1 Single & RB-MA2 Dual Microphone Amplifiers
Redbox User Handbook 1-1
1. RB-MA1 Single & RB-MA2 Dual
Microphone Amplifiers
1.1. Introduction
Fig 1-1: RB-MA1 & RB-MA2 Front Panel
The RB-MA1 consists of an independent low-noise microphone pre-amplifier for
converting microphone level signals to line level, or for driving long lines from
microphones to mixing equipment. The RB-MA2 dual microphone amplifier consists of
two low noise pre amplifiers.
All connections and controls are on the rear panel. The microphone input is XLR-3
type and is electronically balanced. The input gain can be adjusted individually by a
recessed pre-set potentiometer.
The XLR-3 line output is electronically balanced and can be wired unbalanced by
grounding the non-phase signal, allowing you to feed both balanced and unbalanced
equipment.
For each channel there are independent switches to control a high pass filter (low
frequency roll-off at 125Hz) and to provide phantom power at +48V to the connected
microphone. An LED power indicator on the front panel displays the power supply
connection.
The rest of this chapter will refer to both RB-MA1 and RB-MA2 unless stated
otherwise.
Chapter 1 - RB-MA1 Single & RB-MA2 Dual Microphone Amplifiers
1-2 Redbox User Handbook
1.2. System Block Diagram
Fig 1-2: RB-MA1 & RB-MA2 Block Diagram Single Channel
1.3. Rear Panel Connections and Operation
Fig 1-3: RB-MA1 Rear Panel
Fig 1-4: RB-MA2 Rear Panel
Balanced
Microphone
Input
Professional
balanced output
Gain
Phantom
power
(48V)
48V
Phantom supply on/off
Ultra low noise
high gain
amplifier
L.F. Filter in/out
L.F.
filter
Disconnect the mains supply before removing the equipment covers.
OUTPUT
PHANTOM
POWER ON
LF FILTER ON
MIC INPUT
GAIN
This product must be earthed
115V - 230V
1.3.1
1.3.2
1.3.4 1.3.5
1.3.3
Disconnect the mains supply before removing the equipment covers.
OUTPUT 2
INPUT 2
LF FILTER
OUTPUT 1
PHANTOM
POWER
INPUT 1 INPUT 2
INPUT 1
LF FILTER
GAIN
MIC INPUT 2MIC INPUT 1
GAIN
This product must be earthed
115V - 230V
1.3.1
1.3.2
1.3.4 1.3.5
1.3.3
Chapter 1 - RB-MA1 Single & RB-MA2 Dual Microphone Amplifiers
Redbox User Handbook 1-3
1.3.1. Mic Inputs
The XLR 3 pin sockets used for the microphone are electronically balanced. They have
the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
1.3.2. Input Gain
Recessed pre-set potentiometers allow for adjustment of the gain of the microphone
inputs. This provides a gain range of 36dB to 75dB which enables the use of dynamic
and powered microphones. Connect the mic input and adjust the gain until the line
output is at the level that you need.
Fig 1-4: Switch to Control LF Filter and Phantom Power
1.3.3. Using Phantom Powered Microphones
For the input channel there are independent switches to provide phantom power at
+48V to the connected microphones. With phantom power selected, a voltage of
+48V is applied to pins 2 and 3 of the XLR connector to power the microphone,
supplied through 6k8 resistors giving a current of 14mA. Phantom power is used when
the switch is pointing towards the arrow.
1.3.4. Using the LF Filter
A switch also provides control for a high pass filter with low frequency roll off at
125Hz. The roll-off filter is in when the switch is in the down position (towards the
arrow).
1.3.5. Output
The XLR 3 pin plug output connector is electronically balanced and can be wired
unbalanced by grounding the non-phase signal, allowing you to feed balanced and
unbalanced equipment. It has the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
The connector provides a line level output with an impedance of <50Ω and a
maximum output level of +28dBu.
1
On On
On On
2 3 4
1. Channel 1 Low Frequency (L.F.) Filter
2. Channel 1 Phantom Power
3. Channel 2 Phantom Power (only applies to MA2)
4. Channel 2 Low Frequency (L.F.) Filter (only applies to MA2)
Chapter 1 - RB-MA1 Single & RB-MA2 Dual Microphone Amplifiers
1-4 Redbox User Handbook
1.4. Technical Specifications
1.4.1. Audio Specifications
Maximum Input Level: -10dBu
Maximum Output Level: +28dBu
Input Impedance: 20kΩ nominal balanced
Output Impedance: <50Ω
Low Frequency Roll-Off: 125Hz @ 6dB/octave
Gain Range: Adjustable 36dB to 75dB gain
E.I.N: 130dB
Distortion: 0.01% THD @ 1kHz, ref +8dBu output
Common Mode Rejection: >66dB typically
Phantom Power: 48V
Frequency Response: 20Hz to 20kHz ±0.1dB (600Ω load, ref 1kHz)
1.4.2. Connections
Input: 1 (2 on RB-MA2) x XLR 3 pin female (Balanced)
Output: 1 (2 on RB-MA2) x XLR 3 pin male (Balanced, can be
unbalanced)
Mains Input: Filtered IEC, 110V-120V, or 220-240V switchable, fused,
6W maximum
1.4.3. Equipment Type
RB-MA1: Single microphone amplifier
RB-MA2: Dual microphone amplifier
1.4.4. Physical Specifications
Dimensions (Raw): 28cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
Dimensions (Boxed): 36cm (W) x 20.5cm (D) x 6cm (H)
Weight RB-MA1: Nett: 0.90kg Gross: 1.35kg
Weight RB-MA2: Nett: 1.00kg Gross: 1.45kg
Chapter 2 - RB-SM1 Single & RB-SM2 Dual Stereo to Mono Converter
Redbox User Handbook 2-1
2. RB-SM1 Single & RB-SM2 Dual Stereo To
Mono Converter ……
2.1. Introduction
Fig 2-1: RB-SM1 & RB-SM2 Front Panel
The RB-SM1 consists of an independent converter that will produce a fully buffered
and balanced mono line output from a stereo input. The RB-SM2 consists of two
independent converters and will produce two fully buffered and balanced mono line
outputs from two stereo inputs.
All connections are on the rear panel. The XLR-3 inputs are electronically balanced
with an impedance of 20kΩ bridging. These can be wired unbalanced to accept an
output from domestic equipment.
The XLR-3 line output’s are electronically balanced with an output impedance of
<50Ω. The output’s can be wired unbalanced by grounding the non-phase signal,
allowing you to feed both balanced and unbalanced equipment.
Output gain adjustment using a pre-set potentiometer for both converters allows a
normalised mono output from domestic stereo equipment. The potentiometer is
accessible through the rear panel. An LED power indicator on the front panel displays
the power supply connection.
The rest of this manual will refer to the SM1 unless stated otherwise.
Chapter 2 - RB-SM1 Single & RB-SM2 Dual Stereo to Mono Converter
2-2 Redbox User Handbook
2.2. System Block Diagram
Fig 2-2: RB-SM1 & RB-SM2 Block Diagram Single Channel
2.3. Rear Panel Connections and Operation
Fig 2-3: RB-SM1 Rear Panel
Fig 2-4: RB-SM2 Rear Panel
Gain
Summing
amplifier
Professional
balanced
stereo input
Left
Right
Professional
balanced
mono output
Disconnect the mains supply before removing the equipment covers.
MONO OUTPUT
LEVEL
L - INPUT - R
This product must be earthed
115V - 230V
Disconnect the mains supply before removing the equipment covers.
MONO OUTMONO OUT
LEVEL
LEVEL
L - INPUT 1 - R L - INPUT 2 - R
This product must be earthed
115V - 230V
Chapter 2 - RB-SM1 Single & RB-SM2 Dual Stereo to Mono Converter
Redbox User Handbook 2-3
2.3.1. Stereo Inputs 1 (& 2)
The input’s are a stereo pair consisting of two XLR 3 pin sockets electronically
balanced with an impedance of 20kΩ bridging. They can be wired unbalanced to
accept an output from domestic equipment. They have the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
2.3.2. Mono Output 1 (& 2)
The XLR 3 pin mono output connectors are electronically balanced with an output
impedance of <50Ω. They can be wired unbalanced by grounding the non-phase
signal, enabling you to feed both balanced and unbalanced equipment. The output has
the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
2.3.3. Output Gain
Output gain adjustment using a pre-set potentiometer for the converters allows a
normalised mono output from domestic stereo equipment. The potentiometers are
accessible through the rear panel and provide a gain range of 8dB loss to 18dB gain.
Chapter 2 - RB-SM1 Single & RB-SM2 Dual Stereo to Mono Converter
2-4 Redbox User Handbook
2.4. Technical Specifications
2.4.1. Audio Specifications
Maximum Input Level: +28dBu
Maximum Output Level: +28dBu
Input Impedance: >20k balanced bridging Ω
Output Impedance: <50Ω balanced
Frequency Response: 20Hz to 20kHz ±0.1dB (600Ω load, ref 1kHz)
Gain Range: Adjust 8dB loss to 18dB gain, ref 0dB input on L and R
Common Mode Rejection: >66dB typically
Distortion: 0.01% THD @ 1kHz, ref +8dBu output
Noise: -100dB unity gain, ref +8dBu output
2.4.2. Connections
Inputs: 2 (4 on RB-SM2) x XLR 3 pin female (Balanced, can be
unbalanced)
Output: 1 (2 on RB-SM2) x XLR 3 pin male (Balanced, can be
unbalanced)
Mains Input: Filtered IEC, 110V-120V, or 220-240V switchable, fused,
6W maximum
2.4.3. Equipment Type
RB-SM1: Dual stereo to mono converter
RB-SM2: Single stereo to mono converter
2.4.4. Physical Specifications
Dimensions (Raw): 28cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
Dimensions (Boxed): 36cm (W) x 20.5cm (D) x 6cm (H)
Weight RB-SM1: Nett: 1.00kg Gross: 1.45kg
Weight RB-SM2: Nett: 1.05kg Gross: 1.50kg
Chapter 3 - RB-UL1 Single, RB-UL2 Dual & RB-UL4 Quad
Stereo Unbalanced to Balanced Converters
Redbox User Handbook 3-1
3. RB-UL1 Single, RB-UL2 Dual & RB-UL4
Quad Stereo Unbalanced To Balanced
Converters
3.1 Introduction
Fig 3-1: RB-UL1 & RB-UL2 Front Panel
RB-UL4
QUAD UNBA L - BAL CONVER TER
Fig 3-2: RB-UL4 Front Panel
The RB-UL1 single, RB-UL2 dual & RB-UL4 quad stereo units are used for interfacing
domestic, or semi-pro unbalanced equipment to professional balanced line levels.
All connections are on the rear panel. The RCA unbalanced inputs have an impedance
of 10kΩ bridging and are routed to the balanced XLR-3 outputs with an output
impedance of <50Ω.
The RB-UL1 has two inputs & outputs, the RB-UL2 has four inputs & outputs and the
RB-UL4 has eight inputs & outputs.
The output gain can be individually adjusted for left and right channels by using pre-
set potentiometers accessible through the rear panel. A LED power indicator on the
front panel displays the power supply connection.
Chapter 3 - RB-UL1 Single, RB-UL2 Dual & RB-UL4 Quad
Stereo Unbalanced to Balanced Converters
3-2 Redbox User Handbook
3.2 System Block Diagram
Fig 3-3: RB-UL1 Block Diagram For a Single Channel
3.3 Rear Panel Connections and Operation
Fig 3-4: RB-UL1 Rear Panel
Fig 3-5: RB-UL2 Rear Panel
Professional
balanced output -L
Gain
Gain
Input -L
consumer
unbalanced
Input -R
consumer
unbalanced
Phono
Phono
Professional
balanced output -R
Disconnect the mains supply before removing the equipment covers.
INPUT
LEVEL
L
R
L - OUTPUT - R
This product must be earthed
115V - 230V
3.3.1 3.3.2
3.3.3
Disconnect the mains supply before removing the equipment covers.
This product must be earthed
INPUT 2
LEVEL
L
R
L - OUTPUT 2 - RINPUT 1
LEVEL
L
R
L - OUTPUT 1 - R
115V - 230V
3.3.23.3.1
3.3.3
Chapter 3 - RB-UL1 Single, RB-UL2 Dual & RB-UL4 Quad
Stereo Unbalanced to Balanced Converters
Redbox User Handbook 3-3
Fig 3-6: RB-UL4 Rear Panel
3.3.1. RCA Phono Inputs (Left and Right)
The stereo left and right RCA inputs are unbalanced and have an impedance of 10kΩ.
They are routed to the stereo balanced XLR 3 pin output connectors.
3.3.2. Outputs (Left and Right)
The XLR 3 pin output plug connectors are electronically balanced with an output
impedance of <50Ω. They have the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
3.3.3. Output Level Adjustment
The output gain can be individually adjusted for left and right channels through pre-
set potentiometers which are accessible through the rear panel. The gain range of the
unbalanced to balanced converter is -15dBu to +15dBu ref -15dBu into the
unbalanced input.
Disconnect the mains supply before removing the equipment covers.
This product must be earthed
INPUT 4
LEVEL
L
R
L - OUTPUT 4 - RINPUT 2
LEVEL
L
R
L - OUTPUT 2 - RINPUT 1
LEVEL
L
R
L - OUTPUT 1 - R INPUT 3
LEVEL
L
R
L - OUTPUT 3 - R
3.3.2
3.3.3
3.3.1
Chapter 3 - RB-UL1 Single, RB-UL2 Dual & RB-UL4 Quad
Stereo Unbalanced to Balanced Converters
3-4 Redbox User Handbook
3.4 Technical Specifications
3.4.1. Audio Specifications
Maximum Input Level: +28dBu
Input Impedance: >10kΩ
Output Impedance: <50Ω
Maximum Output Level: +28dBu
Distortion: 0.01% THD @ 1kHz ref +8dB output
Noise: -100dB unity gain, ref +8dB output
Common Mode Rejection: >66dB typically
Frequency Response: 20Hz to 20kHz ±0.1dB (600Ω load, ref 1kHz)
Gain Range: Balanced output: -15dBu to 15dBu, ref -15dBu into
unbalanced RCA input
3.4.2. Connections
Inputs: 2, 4 (RB-UL2) or 8 (RB-UL4) x RCA phono (unbalanced)
Outputs: 2, 4 (RB-UL2) or 8 (RB-UL4) x XLR 3 pin male (balanced)
Mains Input: Filtered IEC, 110V-120V, or 220-240V switchable, fused,
6W maximum
3.4.3. Equipment Type
RB-UL1: Single stereo unbalanced to balanced converter
RB-UL2: Dual stereo unbalanced to balanced converter
RB-UL4: Quad stereo unbalanced to balanced converter
3.4.4. Physical Specifications
RB-UL1 & RB-UL2:
Dimensions (Raw): 28cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
Dimensions (Boxed): 36cm (W) x 20.5cm (D) x 6cm (H)
Weight RB-UL1: Nett: 1.00kg Gross: 1.45kg
Weight RB-UL2: Nett: 1.05kg Gross: 1.5kg
RB-UL4:
Dimensions (Raw): 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
Dimensions (Boxed): 53cm (W) x 20.5cm (D) x 6cm
Weight: Nett: 1.3kg Gross: 1.9kg
Chapter 4 - RB-LU4 Quad Stereo Balanced to Unbalanced Converter
Redbox User Handbook 4-1
4. RB-LU4 Quad Stereo Balanced To
Unbalanced Converter ……
4.1. Introduction
RB-LU4
QUAD BAL-UNBAL CONV ERTER
Fig 4-1: RB-LU4 Front Panel
The RB-LU4 is a quad stereo unit for interfacing professional balanced equipment to
domestic, or semi-pro unbalanced line levels.
All connections are on the rear panel. The eight XLR-3 electronically balanced inputs
have an impedance of 20kΩ bridging and are routed to eight unbalanced RCA phono
outputs with an output impedance of <50Ω.
The output gain can be individually adjusted for left and right channels by using pre-
set potentiometers accessible through the rear panel. An LED power indicator is
situated on the front panel, which displays the power supply connection.
Chapter 4 - RB-LU4 Quad Stereo Balanced to Unbalanced Converter
4-2 Redbox User Handbook
4.2. System Block Diagram
Fig 4-2: RB-LU4 Block Diagram
Gain
Gain
Gain
Gain
Gain
Gain
Gain
Gain
Input 1 -L
professional
balanced
Input 3 -L
professional
balanced
Input 2 -L
professional
balanced
Input 4 -L
professional
balanced
Input 1 -R
professional
balanced
Input 3 -R
professional
balanced
Input 2 -R
professional
balanced
Input 4 -R
professional
balanced
Phono
Phono
Phono
Phono
Phono
Phono
Phono
Phono
Consumer unbalanced
output 1 -L
Consumer unbalanced
output 3 -L
Consumer unbalanced
output 2 -L
Consumer unbalanced
output 4 -L
Consumer unbalanced
output 1 -R
Consumer unbalanced
output 3 -R
Consumer unbalanced
output 2 -R
Consumer unbalanced
output 4 -R
Chapter 4 - RB-LU4 Quad Stereo Balanced to Unbalanced Converter
Redbox User Handbook 4-3
4.3. Rear Panel Connections and Operation
Fig 4-3: RB-LU4 Rear Panel
4.3.1. Inputs 1-4 (Left and Right)
The XLR 3 pin sockets used for the left and right channel inputs of Input 1 are
electronically balanced and have an impedance of 20kΩ bridging. They are routed to
an unbalanced RCA (phono) output with an output impedance of <50Ω. Each XLR has
the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
4.3.2. RCA Phono Outputs 1-4 (Left and Right)
These RCA (phono) outputs are unbalanced and have an output impedance of <50Ω.
4.3.3. Output Level Adjustment
The output gain can be individually adjusted for left and right channels through pre-
set potentiometers which are accessible through the rear panel. The gain of the
balanced to unbalanced converter is variable within a range of -28dBu to +15dBu ref.
-15dBu into the balanced input.
Disconnect the mains supply before removing the equipment covers.
This product must be earthed
OUTPUT 1
LEVEL
L - INPUT 1 - R
L
R
OUTPUT 2
LEVEL
L - INPUT 2 - R
L
R
OUTPUT 3
LEVEL
L - INPUT 3 - R
L
R
OUTPUT 4
LEVEL
L - INPUT 4 - R
L
R
Chapter 4 - RB-LU4 Quad Stereo Balanced to Unbalanced Converter
4-4 Redbox User Handbook
4.4. Technical Specifications
4.4.1. Audio Specifications
Maximum Input Level: +28dBu
Input Impedance (XLR): >20kΩ balanced bridging
Output Impedance (RCA): <50Ω
Maximum Output Level: +22dBu
Distortion: 0.01% THD @ 1kHz, ref +8dBu output
Noise: -100dB, unity gain, ref +8dBu output
Common Mode Rejection: >66dB typically
Frequency Response: 20Hz to 20kHz ±0.1dB (600Ω load, ref 1kHz)
Gain Range: Unbalanced Output : -28dBu to +15dBu, ref -15dBu into
balanced XLR input
4.4.2. Connections
Inputs: 8 x XLR 3 pin female (Balanced)
Outputs: 8 x RCA phono (Unbalanced)
Mains Input: Filtered IEC, 110V-120V, or 220-240V switchable, fused,
6W maximum
4.4.3. Equipment Type
RB-LU4: Quad stereo balanced to unbalanced converter
4.4.4. Physical Specifications
Dimensions (Raw): 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
Dimensions (Boxed): 53cm (W) x 20.5cm (D) x 6cm (H)
Weight: Nett: 1.3kg Gross: 1.9kg
Chapter 5 - RB-BL2 Single & RB-BL4 Dual Bi-Directional Matching Converter
Redbox User Handbook 5-1
5. RB-BL2 Single & RB-BL4 Dual Bi-
Directional Matching Converter
5.1. Introduction
Fig 5-1: RB-BL2 Front Panel
RB-BL4
DUAL BI -DIRECT IONAL CONVERT ER
Fig 5-2: RB-BL4 Front Panel
The RB-BL2 is a bi-directional stereo unit for interfacing domestic, or semi-pro
unbalanced equipment to professional balanced line levels, and vice-versa. The RB-
BL4 has dual bi-directional stereo capability.
All connections are on the rear panel. The XLR-3 electronically balanced inputs have
an impedance of 20kΩ bridging and are routed to unbalanced RCA (phono) outputs
with an output impedance of <50Ω.
The RCA unbalanced inputs have an impedance of 10kΩ bridging and are routed to
balanced XLR-3 outputs with an output impedance of <50Ω.
The output gain can be individually adjusted for left and right channels by using pre-
set potentiometers accessible through the rear panel. An LED power indicator on the
front panel displays the power supply connection.
Chapter 5 - RB-BL2 Single & RB-BL4 Dual Bi-Directional Matching Converter
5-2 Redbox User Handbook
5.2. System Block Diagram
Professional
balanced output 2 -L
Gain
Gain
Gain
Gain
Input 1 -L
professional
balanced
Input 1 -R
professional
balanced
Input 2 -L
consumer
unbalanced
Input 2 -R
consumer
unbalanced
Phono
Phono
Phono
Phono Consumer unbalanced
output 1 -L
Consumer unbalanced
output 1 -R
Professional
balanced output 2 -R
Fig 5-3: RB-BL2 Block Diagram Single Stereo Channel
Chapter 5 - RB-BL2 Single & RB-BL4 Dual Bi-Directional Matching Converter
Redbox User Handbook 5-3
5.3. Rear Panel Connections and Operation
Fig 5-4: RB-BL2 Rear Panel
Fig 5-5: RB-BL4 Rear Panel
Disconnect the mains supply bef ore removing the equipment cover s.
This product must be earthed
L - OUTPUT 4 - RINPUT 4OUTPUT 3
LEVEL LEVEL
L
R
L - INPUT 3 - R
LEVEL
L - OUTPUT 2 - RINPUT 2OUTPUT 1
LEVEL
L - INPUT 1 - R
L
R
115V - 230V
Disconnect the mains supply before removing the equipment covers.
INPUT 2OUTPUT 1
LEVEL LEVEL
L - INPUT 1 - R
L
R
L - OUTPUT 2 - R
5.3.1.1 5.3.1.2 5.3.2.1 5.3.2.2
This product must be earthed
115V - 230V
5.3.1.3 5.3.2.3
Chapter 5 - RB-BL2 Single & RB-BL4 Dual Bi-Directional Matching Converter
5-4 Redbox User Handbook
5.3.1. Balanced to Unbalanced Connections
5.3.1.1. Inputs 1 (& 3) (Left & Right)
The XLR 3 pin sockets used for the left and right channel signals of Input 1 / 1 & 3 are
electronically balanced and have an impedance of 20kΩ bridging. They are routed to
an unbalanced RCA (phono) outputs with an output impedance of <50Ω. Each XLR
has the following connections:
Pin 1: Screen.
Pin 2: Phase.
Pin 3: Non-phase.
5.3.1.2. RCA Phono Outputs 1 (& 3) (Left & Right)
These RCA (phono) outputs are unbalanced and have an output impedance of <50Ω.
5.3.1.3. Output Level Adjustment
The output gain can be individually adjusted for left and right channels through pre-
set potentiometers which are accessible through the rear panel. The gain of the
balanced to unbalanced converter is variable within a range of 0dBu to -28dBu ref -
0dBu into the balanced input.
5.3.2. Unbalanced to Balanced Connections
5.3.2.1. RCA Phono Inputs 2 (& 4) (Left & Right)
The two / four left and right RCA inputs are unbalanced and have an impedance of
10kΩ. They are routed to the two / four balanced XLR 3 pin output connectors.
5.3.2.2. Outputs 2 (& 4) (Left & Right)
The XLR 3 pin output plug connectors are electronically balanced with an output
impedance of <50Ω. They have the following connections:
Pin 1: Screen.
Pin 2: Phase.
Pin 3: Non-phase.
Chapter 5 - RB-BL2 Single & RB-BL4 Dual Bi-Directional Matching Converter
Redbox User Handbook 5-5
5.4. Technical Specifications
5.4.1. Audio Specifications
Maximum Input Level: +28dBu
Maximum Output Level: +28dBu
Input Impedance (RCA): >10kΩ unbalanced
Input Impedance (XLR): >20kΩ balanced bridging
Output Impedance (RCA): <50Ω
Output Impedance (XLR): <50Ω
Distortion: 0.01% THD @ 1kHz, ref +8dBu output
Noise: -100dB, unity gain, ref +8dBu output
Common Mode Rejection: >66dB typically
Frequency Response: 20Hz to 20kHz ±0.1dB (600Ω load, ref 1kHz)
Gain Range: Unbalanced Output : -28dBu to +15dBu, ref -15dBu into
balanced XLR input
Gain Range: Balanced Output : -15dBu to +15dBu, ref -15dBu into
unbalanced RCA input
5.4.2. Connections
Inputs: 2 (4 on RB-BL4) x XLR 3 pin female (balanced),
2 (4 on RB-BL4) x RCA phono (unbalanced)
Outputs: 2 (4 on RB-BL4) x XLR 3 pin male (balanced),
2 (4 on RB-BL4) x RCA phono (unbalanced)
Mains Input: Filtered IEC, 110V-120V, or 220-240V switchable, fused,
6W maximum
5.4.3. Equipment Type
RB-BL2: Single Stereo Bi-Directional Matching Converter
RB-BL4: Dual Stereo Bi-Directional Matching Converter
5.4.4. Physical Specification
RB-BL2:
Dimensions (Raw): 28cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
Dimensions (Boxed): 36cm (W) x 20.5cm (D) x 6cm (H)
Weight: Nett: 1.0kg Gross: 1.4kg
RB-BL4:
Dimensions (Raw) 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U )
Dimensions (Boxed) 53cm (W) x 20.5cm (D) x 6cm (H)
Weight Nett: 1.3kg Gross: 1.9kg
Chapter 5 - RB-BL2 Single & RB-BL4 Dual Bi-Directional Matching Converter
5-6 Redbox User Handbook
Chapter 6 - RB-SL2 Twin Mono, or Stereo, Limiter
Redbox User Handbook 6-1
6. RB-SL2 Twin Mono, or Stereo, Limiter
6.1. Introduction
Fig 6-1: RB-SL2 Front Panel
The RB-SL2 is a stereo, or twin independent mono, VCA limiter for use in news-rooms
and other locations where the correct level into recording equipment is required, but
not necessarily under the control of an engineer, for example, for overload protection.
It can also be used as an inexpensive main output limiter for low cost radio
installations, RSL’s, hospital and student radio.
The XLR-3 electronically balanced inputs and outputs can be wired unbalanced to
accept an output from domestic equipment. For each channel there is an input gain and
a threshold level control.
A rear panel switch changes the unit from dual mono to stereo, when only the pre-sets
for channel 1 (left) are active and apply to both channels. An LED power indicator on
the front panel displays the power supply connection.
Chapter 6 - RB-SL2 Twin Mono, or Stereo, Limiter
6-2 Redbox User Handbook
6.2. System Block Diagram
Limiter
stage
Gain and
limit
control
Balanced
professional
input R
Balanced
professional
input L
Limiter
stage
Gain and
limit
control
Select stereo/mono
Balanced
professional
output L
Balanced
professional
output R
Fig 6-2: RB-SL2 Block Diagram
Chapter 6 - RB-SL2 Twin Mono, or Stereo, Limiter
Redbox User Handbook 6-3
6.3. Rear Panel Connections and Operation
STEREO
DUAL
MONO GAINGAIN
OUTPUT 2INPUT 2OUTPUT 1 INPUT 1
SERIAL No.
Disconnect the mains supply before removing the equipment covers.
MODE LIMIT LEVELLIMIT LEVEL
Fig 6-3: RB-SL2 Rear Panel
6.3.1. Outputs
The XLR 3 pin plug connectors are electronically balanced and can be wired unbalanced
to accept an output from domestic equipment. They have the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
6.3.2. Inputs
The XLR 3 pin sockets are electronically balanced, and can be wired unbalanced to
accept an output from domestic equipment. They have the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
6.3.3. Gain
Each channel has an input gain (GAIN) and a threshold level control (LIMIT LEVEL).
Setting the limit level to maximum (fully anti-clockwise) enables the input through to
output to be normalised using the input gain potentiometers. Once the unit is acting as
a buffer with gain/attenuation, the limit level can be set, with the recovery adjusted for
the application. Limiting is indicated by the power LED on the front panel flashing.
6.3.4. Mode
This switch changes the unit from dual mono to stereo mode. In stereo mode, only the
pre-sets for channel 1 (left) are active and they are applied to both channels. Stereo
limiting operates by limiting both left and right outputs if either left or right input needs
to be limited. Dual mono limiting operates by limiting left and right signals individually
– you can use the RB-SL2 as two separate mono limiters.
Chapter 6 - RB-SL2 Twin Mono, or Stereo, Limiter
6-4 Redbox User Handbook
6.4. Technical Specifications
6.4.1. Audio Specifications
Maximum Input Level: +28dBu
Maximum Output Level: +28dBu
Input Impedance: >20kΩ bridging
Output Impedance: <50Ω
Input Gain: Adjustable -8dBu to +18dBu gain
Limit Threshold: Adjustable -8dBu to +28dBu
Frequency Response: 20Hz to 20kHz ±0.1dB (600Ω load, ref 1kHz)
Noise: -100dB unity gain, ref +8dBu
Distortion: 0.01% THD @ 1kHz ref +8dBu output, threshold set at
+10dBu
Common Mode Rejection: >66dB typically
6.4.2. Connections
Inputs: 2 x XLR 3 pin female (Balanced, can be unbalanced)
Outputs: 2 x XLR 3 pin male (Balanced, can be unbalanced)
Mains Input: Filtered IEC, 110V-120V, or 220-240V switchable, fused, 6W
maximum
6.4.3. Equipment Type
RB-SL2: Twin mono, or stereo, limiter
6.4.4. Physical Specifications
Dimensions (Raw): 28cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
Dimensions (Boxed): 36cm (W) x 20.5cm (D) x 6cm (H)
Weight: Nett: 1.0kg Gross: 1.45kg
Chapter 7 - RB-DA6 6 Way Stereo Distribution Amplifier
Redbox User Handbook 7-1
7. RB-DA6 6 Way Stereo Distribution
Amplifier
7.1. Introduction
MONO
LR
MONO
STEREO
RB-DA6
DISTRI BUTION AMPLI FIER
Fig 7-1: RB-DA6 Front Panel
The RB-DA6 is a high performance 6 way stereo analogue audio distribution amplifier
for splitting a source to a number of different outputs. The RB-DA6 has 1 stereo input
and 6 stereo outputs. It can also be configured so that 1 mono input can be
distributed to 12 outputs.
The XLR-3 inputs and outputs are electronically balanced and can be wired
unbalanced. Each output is individually buffered so that a short circuit on one won’t
affect the others. The outputs can be wired unbalanced.
The left and right input gain controls (normalising) are pre-set potentiometers
accessible through the front panel. The 1-12 mono, 1-6 stereo switch is recessed on
the front panel to prevent accidental knocking. An LED power indicator on the front
panel displays the power supply connection.
Chapter 7 - RB-DA6 6 Way Stereo Distribution Amplifier
7-2 Redbox User Handbook
7.2. System Block Diagram
123456 123456
Left channel
balanced outputs
Right channel
balanced outputs (mono 7-12)
Left channel
balanced input
Right channel
balanced input
Stereo/mono
Fig 7-2: RB-DA6 Block Diagram
Chapter 7 - RB-DA6 6 Way Stereo Distribution Amplifier
Redbox User Handbook 7-3
7.3. Rear Panel Connections and Operation
Fig 7-3: RB-DA6 Rear Panel
7.3.1. Inputs (Left and Right)
The XLR-3 input connectors can take balanced professional levels, or unbalanced by
using the front panel gain controls, and by connecting the non-phase to the signal
ground. The input can be configured as either a stereo input with six stereo outputs or
a mono input with twelve outputs. The XLR 3 pin input has the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
7.3.2. Stereo Outputs 1-6 (Mono Outputs 1-12)
The XLR 3 pin outputs are electronically balanced, and can be wired unbalanced. Each
output is individually buffered so that a short circuit on one output will not affect the
others. They have the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
7.4. Front Panel Connections and Controls
Fig 7-4: RB-DA6 Front Panel
7.4.1. Input Gain Control
The output gain may be varied from –8dB to 18db by adjusting the pre-set
potentiometers, which are accessible through the holes in the front panel. This is
useful for normalising consumer and professional signals to give outputs of –15dBu
and 0dBu respectively.
L - INPUT - R L - OUTPUT 1 - R L - OUTPUT 2 - R
1 2 3MONO 4
L - OUTPUT 3 - R
5 6
Disconnect the mains supply before removing the equipment covers.
7
L - OUTPUT 4 - R
8 9 10 11
L - OUTPUT 5 - R L - OUTPUT 6 - R
12
This product must be earthed
115V - 230V
Disconnect the mains supply before removing the equipment covers.
7.3.1 7.3.2
MONO
L R
MONO
STEREO
7.4.1 7.4.2
RB-DA6
DISTRIBU TION AMPLIFIER
Chapter 7 - RB-DA6 6 Way Stereo Distribution Amplifier
7-4 Redbox User Handbook
7.4.2. Stereo/Mono Operation
The mode of operation may be switched between a stereo distributed channel to 6
stereo channels, and a mono channel to 12 mono channels, by the push button on the
front panel which is recessed to prevent accidental switching.
7.5. Technical Specifications
7.5.1. Audio Specifications
Maximum Input Level: +28dBu
Maximum Output Level: +28dBu
Input Impedance: >20kΩ bridging
Output Impedance: <50Ω
Frequency Response: 20Hz to 20kHz ±0.1dB (600Ω load, ref 1kHz)
Gain Range: Adjustable 8dB loss to 18dB gain (L & R adjust).
Distortion: 0.01% THD @1kHz, ref +8dBu output
Noise: -100dB unity gain, ref +8dBu output
Common Mode Rejection: >66dB typically
7.5.2. Connections
Inputs: 2 x XLR 3 pin female (Balanced, can be unbalanced)
Outputs: 12 x XLR 3 pin male (Balanced, can be unbalanced)
Mains Input: Filtered IEC, 110V-120V, or 220-240V switchable, fused,
6W maximum
7.5.3. Equipment Type
RB-DA6: 6 way stereo distribution amplifier
7.5.4. Physical Specifications
Dimensions (Raw): 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
Dimensions (Boxed): 53cm (W) x 20.5cm (D) x 6cm (H)
Weight: Nett: 1.3kg Gross: 1.9kg
Chapter 8 - RB-HD1 Stereo Headphone Amplifier
Redbox User Handbook 8-1
8. RB-HD1 Stereo Headphone Amplifier
8.1. Introduction
RB-HD1
HEADPHONE AMPLIFI ER
HEADPHONE VOLUME
Fig 8-1: RB-HD1 Front Panel
The RB-HD1 is a 1U rack-mount stereo headphone amplifier for driving up to two pairs
of professional stereo headphones from a single stereo or mono input. One headphone
socket is on the front panel with one on the rear.
The main stereo input uses electronically balanced XLR-3 connectors on the rear panel,
which can be wired un-balanced. The output volume for the headphones can be
controlled either by a pot situated on the front panel or a VCA signal supplied
externally via the remote connector.
A mono input can be mixed into the main headphone feed, for example, for mixing in
talkback to the headphones. This has an input level control via a recessed adjustable
potentiometer. The mono mix input can also be controlled remotely.
A stereo/mono switch is recessed on the rear panel to prevent accidental knocking.
With mono selected, audio is sent to both left and right ear pieces. An LED power
indicator on the front panel displays the power supply connection.
Chapter 8 - RB-HD1 Stereo Headphone Amplifier
8-2 Redbox User Handbook
8.2. System Block Diagram
Fig 8-2: RB-HD1 Block Diagram
8.3. Front Panel Connections and Controls
RB-HD1
HEADPHONE AMPLIFI ER
HEADPH ONE VOLUME
Fig 8-3: RB-HD1 Front Panel
8.3.1. Stereo Outputs 1-2 (Mono Outputs1-2)
The outputs available on the front and rear panel through ¼” stereo jack sockets are
push-pull, designed to drive 150 mW into 32Ω to 600Ω professional headphones. Each
output is individually buffered.
8.3.2. Volume Level Control
The volume level control sets the output level of the two stereo headphone sockets.
The two headphone outputs have a maximum output of +11dBu.
Chapter 8 - RB-HD1 Stereo Headphone Amplifier
Redbox User Handbook 8-3
8.4. Rear Panel Connections and Operation
Disconnect the mains supply before removing the equipment covers.
This product must be eart hed
MONO MIX I NPUT
LEVEL
HEADPHONE
L - INPUT - R
REMOTES
MONO
STEREO
REMOTES
LOCAL
Fig 8-4: RB-HD1 Rear Panel
8.4.1. Stereo Input (Left and Right)
The XLR-3 input connectors can take balanced professional levels, or unbalanced by
using the volume control to increase the input level, and by connecting the non-phase
to the signal ground. The input can be configured as either a stereo input with two
stereo outputs or a mono input with two mono paired outputs. The XLR 3 pin input has
the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
8.4.2. Mono Mix Input
The XLR-3 input connector can take balanced professional levels, or unbalanced by
connecting the non-phase to the signal ground. This input is used for mixing with the
main stereo input, which is controlled by the MIX_EN pin (pin 8 on the remote
connector) on the remote connector. While this signal is shorted to the ground pin (pin
9 on the remote connector) mixing is enabled and is only disabled once the signal from
MIX_EN to pin 9 is open on the remote connector. The XLR 3 pin input has the
following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
A rotary pre-set potentiometer can be used to adjust the gain of the mono mix input
by 22dBu.
8.4.3. Stereo/Mono Operation
The mode of operation may be switched between a stereo channel, or a mono channel
to two mono paired outputs (i.e. the same signal to both earpieces), by the push
button on the rear panel which is recessed to prevent accidental switching.
8.4.4. Local/Remote Control Operation
The level to the two outputs can be controlled in one of two ways, either locally, by the
pot situated on the front panel or remotely, by a VCA signal supplied externally to the
remote connector.
Chapter 8 - RB-HD1 Stereo Headphone Amplifier
8-4 Redbox User Handbook
8.4.5. Remote Connector
The remote connector is a 9-pin D-type socket, which is situated on the rear panel. It
has connections as shown below.
Pin No. Signal I/O Description
Pin 1 Pot wiper I Volume control signal
Pin 2 Pot top O +5V
Pin 3 N/C - No connection
Pin 4 N/C - No connection
Pin 5 N/C - No connection
Pin 6 Pot bottom - Ground
Pin 7 N/C - No connection
Pin 8 MIX_EN I Make to pin 9
Pin 9 0V - Ground
Fig 8-5 RB-HD1 Remote Connector
8.5. Technical Specifications
8.5.1. Audio Specifications
Maximum Input Level: +28dBu
Input Impedance: >20kΩ balanced bridging (main),
>10kΩ unbalanced override
Output Level: Drives 150 mW into 32Ω to 600Ω headphones
Volume Control: -80dB to +11dB gain
Mono Mix Input Gain: 22dBu
8.5.2. Connections
Main Stereo Input: 2 x XLR 3 pin female (Balanced, can be wired unbalanced)
Mono Mix Input: 1 x XLR 3 pin female (Balanced, can be wired unbalanced)
Outputs: 2 x ¼” (6.3mm) A/B gauge 3-pole stereo jack sockets
Remote Control: 9-pin D-type socket
Mains Input: Filtered IEC, 110V-120V, or 220-240V switchable, fused, 9W
maximum
8.5.3. Equipment Type
RB-HD1: Stereo headphone amplifier
8.5.4. Physical Specifications
Dimensions (Raw): 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
Dimensions (Boxed): 53cm (W) x 20.5cm (D) x 6cm
Weight: Nett: 1.6kg Gross: 2.2kg
Chapter 9 - RB-HD6 6 Way Stereo Headphone Distribution Amplifier
Redbox User Handbook 9-1
9. RB-HD6 6 Way Stereo Headphone
Distribution Amplifier ……
9.1. Introduction
MASTER LE VEL
654321
+
RB-HD6
HEADPHONE DISTRIBUTION AMPLIFIER
Fig 9-1: RB-HD6 Front Panel
The RB-HD6 is a high performance 6-way stereo headphone distribution amplifier for
driving up to 6 pairs of professional stereo headphones from a single stereo or mono
input. A switch on the rear panel enables the distribution of a mono signal to all twelve
outputs (i.e. both earpieces of a pair of stereo headphones) via the left channel input.
Alternatively, the RB-HD6 can be used as six separate stereo headphone amplifiers by
using the override (insert-point, or break-jack) input associated with each outlet. A
typical application might be to provide common headphone feeds for guests around a
table in a radio studio, with a separately derived feed, perhaps including talkback, for
the presenter. The over-ride inputs can also be configured as parallel outputs (to the
front outputs) by altering jumper settings inside the unit.
The XLR-3 inputs are electronically balanced and can be wired unbalanced. The input
level and output volume controls are all on the front panel. There is a master control
that adjusts the level of the master signal to all the outputs, and 6 output level
controls. This master control can be disabled by the use of internal jumpers. Each
output is designed to drive 150 mW into 32Ω to 600Ω stereo headphones and is
individually buffered.
The stereo/mono switch is recessed on the rear panel to prevent accidental knocking. A
LED power indicator on the front panel displays the power supply connection.
Chapter 9 - RB-HD6 6 Way Stereo Headphone Distribution Amplifier
9-2 Redbox User Handbook
9.2. System Block Diagram
Fig 9-2: RB-HD6 Block Diagram
Audio Input
Amplifier
Push
Switch
Stereo/Mono
Control Switch
Master Volume
Master
Input
XLR
Stereo
Volume
Insert/Parallel
Stereo Jack
Audio Output
Amp
Stereo Jack
Output
Volume
Insert/Parallel
Stereo Jack
Audio Output
Amp
Stereo Jack
Output
Volume
Insert/Parallel
Stereo Jack
Audio Output
Amp
Stereo Jack
Output
Volume
Insert/Parallel
Stereo Jack
Audio Output
Amp
Stereo Jack
Output
Volume
Insert/Parallel
Stereo Jack
Audio Output
Amp
Stereo Jack
Output
Volume
Insert/Parallel
Stereo Jack
Audio Output
Amp
Stereo Jack
Output
Note: Insert/Parallel stereo jacks are jumper
selectable for Insert Input or Parallel Output.
Volume
Disable
Jumper
Jumpers
Jumpers
Jumpers
Jumpers
Jumpers
Jumpers
Chapter 9 - RB-HD6 6 Way Stereo Headphone Distribution Amplifier
Redbox User Handbook 9-3
9.3. Rear Panel Connections and Operation
INSERT POINTS
6 5 4 3 2 1
MONO
STEREO
Disco nnect t he mai ns supply before removing the equi pment covers .
This product must be earthed
9.3.3
L R
INP UT
9.3.1 9.3.2
Fig 9-3: RB-HD6 Rear Panel
9.3.1. Stereo Input (Left and Right)
The XLR-3 input connectors can take balanced professional levels, or unbalanced by
using the front panel master control to increase the input level, and by connecting the
non-phase to the signal ground. The input can be configured as either a stereo input
with six stereo outputs or a mono input with six mono paired outputs. The XLR 3 pin
input has the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
9.3.2. Stereo/Mono Operation
The mode of operation may be switched between a stereo distributed channel to 6
stereo channels, or a mono channel to six mono paired outputs (i.e. the same signal to
both ear pieces), by the push button on the rear panel which is recessed to prevent
accidental switching.
9.3.3. Channel Insertion Inputs or Parallel
Outputs
Each channel has an unbalanced override/insertion input via a ¼” stereo audio jack
socket on the rear panel, which overrides the master input.
Each connector can also be individually configured as a parallel output providing the
same signal as the output on the front of the unit. To configure the jack connector as
an output, you’ll need to alter some jumper settings inside the unit.
9.3.3.1. Removing the Equipment Covers
To get inside the RB-HD6, first ensure that it has been disconnected from the mains
power and that the mains IEC lead to the unit has been removed. Observing anti-static
precautions, undo the four cross-head screws on the back panel at the far left and far
right of the panel (2 at each end). Also undo the small brass screws which
hold the top and bottom panels to the rear panel. The rear panel should slide
backwards out of the unit together with the main circuit board.
Chapter 9 - RB-HD6 6 Way Stereo Headphone Distribution Amplifier
9-4 Redbox User Handbook
9.3.3.2. Configuring Insert Inputs or Parallel
Outputs
On the main circuit board, you’ll see some jumpers (small black rectangles), the
position of which will define whether a particular jack socket operates as an input or
output. The drawings below show the different jumper settings available. Each
input/output can be configured individually, so you could have three jacks set as inputs
and three as outputs if needed.
Input/Output 1 2 3 4 5 6
Left JP1 & 2 JP5 & 6 JP9 & 10 JP13 & 14 JP17 & 18 JP21 & 22 Jumpers
to Alter Right
JP3 & 4 JP7 & 8 JP11 & 12 JP15 & 16 JP19 & 20 JP23 & 24
Once you’ve set up the jumpers, slide the circuit board back into the Redbox housing
using the slots along the inside edge of the metalwork as a guide. Replace the screws
on the top, bottom and rear panels of the RB-HD6.
Important Note : The screws provide earthing protection to the chassis and
grounding protection for CE approval – it is important that you reinsert all the screws
provided.
For Parallel
Output
Left
Channel
Right
Channel
For Insert
Input
1 1
1 1
1 1
1 1
2 2
2 2
2 2
2 2
3 3
3 3
Chapter 9 - RB-HD6 6 Way Stereo Headphone Distribution Amplifier
Redbox User Handbook 9-5
9.4. Front Panel Connections and Controls
MASTER LE VEL
654321
+
9.4.3 9.4.2
9.4.1
RB-HD6
HEADP HONE DI STR IBUTI ON AMPLIFIE R
Fig 9-4: RB-HD6 Front Panel
9.4.1. Stereo Outputs 1-6 (Mono Outputs 1-6)
The outputs available on the front panel through ¼” stereo jack sockets are push-pull,
designed to drive 150 mW into 32Ω to 600Ω professional headphones. Each output is
individually buffered.
9.4.2. Master Level Control
The master level control will set the maximum level of all channels and will need to be
set high if an unbalanced consumer input level (-10dbu) is used. This level control can
be disabled by setting jumpers within the unit. See Section 11.4.3.1 for details on
removing the equipment covers. The two jumpers JP25 and JP26 can be found near the
volume potentiometer VR1 :
Jumper JP25 JP26
Enable Master Level Control On On
Disable Master Level Control Off Off
9.4.3. Channel Volume Controls
Each channel has its own volume control so that you have control of the signal volume
to an individual output whether it is from the master input or the override input.
Chapter 9 - RB-HD6 6 Way Stereo Headphone Distribution Amplifier
9-6 Redbox User Handbook
9.5. Technical Specifications
9.5.1. Audio Specifications
Input Impedance: >20kΩ balanced bridging (main),
>10kΩ unbalanced override
Maximum Input Level: +28dBu
Output Level: Drives 150 mW into 32Ω to 600Ω headphones
Override Inputs: +3dBu for full volume at +18dB gain
Individual Volume Control:-60dB to +18dB gain
Master Volume Control: ±10dB gain
9.5.2. Connections
Main Stereo Inputs: 2 x XLR 3 pin female (Balanced, can be wired unbalanced)
Insert Inputs & 6 x ¼” (6.3mm) A-gauge 3-pole stereo jack sockets
Parallel Outputs: (unbalanced, jumper configured)
Outputs: 6 x ¼” (6.3mm) A-gauge 3-pole stereo jack sockets
Mains Input: Filtered IEC, 110V-120V, or 220-240V switchable, fused, 9W
maximum
9.5.3. Equipment Type
RB-HD6: 6 way stereo headphone distribution amplifier
9.5.4. Physical Specifications
Dimensions (Raw): 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
Dimensions (Boxed): 53cm (W) x 20.5cm (D) x 6cm (H)
Weight: Nett: 1.35kg Gross: 2.0kg
Chapter 10 - RB-SD1 Silence Detection Unit
Redbox User Handbook 10-1
10. RB-SD1 Silence Detection Unit
10.1. Introduction
Fig 10-1: RB-SD1 Front Panel
The RB-SD1 Silence Detect Unit is a 1U rack mount device used to monitor an
unattended stereo studio feed and in the event of the signal going “quiet” after a
given period the unit will switch through an alternative stereo audio signal. This signal
could be a recorded message (e.g. “normal service will be resumed”, etc), a feed
from a CD player or minidisk machine, or an alternative recorded program. Controls
are provided to start external equipment and to provide remote status indication.
It has 2 balanced stereo audio inputs with the maximum input level being +28dBu.
Each input is user-defined as either the main source or auxiliary source and both
sources are monitored for failure, each having a remote failure alarm. In the event of
the main source dropping below a pre-set level for a pre-determined amount of time,
the unit will automatically switch through to the auxiliary signal. The silence detect
level is adjustable between -60dBu and -15dBu in 3dB steps via a 16 position rotary
switch on the rear panel. The silence interval can be adjusted between 2 seconds to
30 seconds in 2 second steps, or, alternatively, set to 2 minutes 5 seconds also via a
16 position rotary switch on the rear panel. The audio outputs use stereo professional
balanced XLR-3 male connectors.
The unit can operate in 2 modes - automatic or manual. In both modes it will
automatically switch over to the auxiliary source on detecting silence. When the main
signal is again detected it will either return to the main signal automatically or
manually depending on the mode chosen.
The RB-SD1 has a number of remote operational features. Remote outputs provide
separate relay contact closures for failure of the main and auxiliary inputs. You can
also control remotely all of the front panel switches for source selection, mode
selection and signal Restore. You can remotely start and stop another piece of
equipment on alarm failure and main signal return respectively. Also, the longest
silence time (2min 5sec) can be set remotely, which is useful if you are expecting to
broadcast a long silence.
The unit can be configured to alarm when either the left or right channel of the main
input source fails, or if the whole stereo signal fails. There are also options to set the
remote start output as momentary or latched, to disable switching to the auxiliary
input on alarming and to increase the gain on the auxiliary input so that an
unbalanced input can be used, for example, from a domestic minidisc player.
RESTORE
ALARM
MODE
AUTO
SOURCE
MAIN B
LED ON
LED OFF
LED FLASH
MAIN A
PRESS RESTORE
MANUAL NORMAL
MAIN
ALARMALARMPROG PROG
LEFT RIGHT LEFT RIGHT
AUX
A
LARM
A
LARMPROG PROG
RB-SD1
SILENCE DETECT
Chapter 10 - RB-SD1 Silence Detection Unit
10-2 Redbox User Handbook
Front panel LED indicators show individually left and right programme and alarm
conditions for both the main and auxiliary inputs. The status of the source, mode and
alarm state are also shown on the front panel with LED indicators.
Additionally, the RB-SD1 can be programmed for specific applications, which can be
defined on power-up of the unit. Contact Sonifex for further information if you have a
particular requirement.
The RB-SD1 has been designed to have a passive signal path through the main input,
so if power to the unit fails, the signal input will still be routed through to the output.
This is essential for applications such as installation at transmitter sites, where a
power failure to the unit should not prevent the audio input signal from being output
to the transmitter.
10.2. System Block Diagram
Fig 10-2: RB-SD1 Block Diagram
Mode Restore
Push
Switch
Main Channel
Select
Push
Switch
Reference
Voltage Select
Monitored
Channel Select
A/B
Switch
Control
Output
Select
Summing
Amp
Summing
Amp
Digital
Pot
Control
Comparator
Stereo Input B
Stereo Input A
Professional
Balanced
Professional
Balanced Left
Right
Left
Right
Stereo Output
Professional
Balanced
Left
Right
Output Select
Default/Power Off
Select Input A
( )
Microprocessor
0...9,A...F
Time Select
0...9,A...F
Mode Select
15 PIN
Remote
Connector
Chapter 10 - RB-SD1 Silence Detection Unit
Redbox User Handbook 10-3
10.3. Rear Panel Connections and Operation
Fig 10-3: RB-SD1 Rear Panel
10.3.1. A/B Inputs (Left and Right)
There are four XLR-3 inputs, two for channel A (Left & Right) and another two for
channel B (Left & Right). The XLR 3 pin sockets are used for the input channels and
are electronically balanced. They have the following connections: -
Pin 1: Screen.
Pin 2: Phase.
Pin 3: Non-phase.
10.3.2. Outputs
The stereo input consists of two XLR male connectors professionally balanced with
following connections: -
Pin 1: Screen.
Pin 2: Phase.
Pin 3: Non-phase.
10.3.3. Level Control
The level rotary switch (Level) adjusts the input sensitivity gain. The gain may be
varied from –15dB to -60db in 3db steps by adjusting the switch, which is accessible
on the rear panel.
Switch 0 1 2 3 4 5 6 7 8 9 A B C D E F
Level dBu -60 -57 -54 -51 -48 -45 -42 -39 -36 -33 -30 -27 -24 -21 -18 -15
10.3.4. Time Control
The time rotary switch (Time) adjusts the duration over which a silence is detected
before alarming and ranges from 2-30 seconds (0 – E in 2 second intervals) with F on
the switch being a 2 min 5 second silence. This maximum time can also be activated
or de-activated remotely via the remote connector.
Switch 0 1 2 3 4 5 6 7 8 9 A B C D E F
Seconds 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 125
REMOTE ALARMS
L - OUTPUT - RL - INPUT B - RL - INPUT A - R
LEVEL TIME
MODE
Disconnect the mains supply before removing the equipment covers.
This product must be earthed
10.3.1 10.3.2 10.3.3 10.3.5
10.3.6
10.3.4
Chapter 10 - RB-SD1 Silence Detection Unit
10-4 Redbox User Handbook
123 4
ON
OFF
10.3.5. Mode Dip Switch Settings
1. Stereo/Mono.
2. Remote Start Mode Switch.
3. Professional levels/Consumer levels (Input B).
4. Switch/No switching when alarmed.
1. Stereo/Mono Switch – The configuration of this defines whether you want to
switch sources when left and/or right channel of the incoming source go silent.
Switch Description
On When on, the unit operates in stereo mode, whereby if one channel
goes quiet the unit will switch, and requires both channels to be present
before it switches back.
Off When off, the unit operates in mono mode. In this mode the unit will
only switch when both channels go quiet, and requires only one channel
to be present before the unit switches back.
2. Remote Start Mode Switch – This defines whether the remote start switch is
momentary or latched. Used for starting external equipment when silence is detected.
Switch Description
On When on, the remote start pin (pin 15) on the remote connector is
pulled low for half a second when the unit switches to the auxiliary
input. (Momentary contact).
Off When off, the remote start pin on the remote connector is pulled low
when the unit switches over to the auxiliary input and remains low until
the unit switches back to the main source or, if in manual mode, is
restored by the user locally or remotely. (Latched contact).
3. Professional/Consumer Switch – This allows you to use an unbalanced piece of
equipment as the auxiliary input, by raising the input gain.
Switch Description
On When on, Input B accepts professional balanced signal level.
Off When off, Input B accepts consumer unbalanced signal level and raises
the input gain received by 12dB.
4. Switch/No Switching in alarm state – This defines whether the unit switches to
the auxiliary input on silence detection.
Switch Description
On When on, if the unit goes into the alarm state the unit switches to the
auxiliary input.
Off When off, if the unit goes into the alarm state the unit does not switch
to the auxiliary input.
Chapter 10 - RB-SD1 Silence Detection Unit
Redbox User Handbook 10-5
10.3.6. Remotes Connector
Displayed below are the pin connections and descriptions for the remote connector:
Pin No. Signal I/O Description
Pin 1 Master Alarm Normally Open O Relay 1 N/O to Pin 9
Pin 2 Master Alarm Normally
Closed
O Relay 1 N/C to Pin 9
Pin 3 Aux. Alarm Normally Open O Relay 2 N/O to Pin 11
Pin 4 Aux. Alarm Normally Closed O Relay 2 N/C to Pin 11
Pin 5 Mode Switch I Momentary make to Pin 8
Pin 6 Mode Indicator O Internal Open Collector to Digital
Ground
Pin 7 Restore Switch I Momentary make to Pin 8
Pin 8 Digital Ground - -
Pin 9 Master Alarm Common O N/O to Pin 1, N/C to Pin 2
Pin 10 Max Time Whilst Latched I Latched make to Pin 8
Pin 11 Aux. Alarm Common O N/O to Pin 3, N/C to Pin 4
Pin 12 +5V O To power up to a maximum
100mA
Pin 13 Source Select Indicator O Internal Open Collector to Digital
Ground
Pin 14 Source Select Switch I Momentary make to Pin 8
Pin 15 Remote Start O Internal Open Collector to Digital
Ground
Pins 1 – 4 are for external use to replicate the alarm conditions for the Main and
Auxiliary inputs. The Aux alarm output can also be used as Remote Stop pin (See
section 12.5.6).
Pins 5 – 7, 13 and 14 are to replicate the switches and indicators for the source
select, mode and restore functions.
Pins 8, 9, 11 and 12 are common or voltage pins.
Pin 10 is to select remotely the maximum silence time (2min 5sec). This may be
useful for the broadcast of Remembrance Day services, or where you expect a silence
of up to 2 minutes to be broadcast. The maximum silence time is set whilst the
contact is latched.
Pin 15 is used to remotely start an external piece of equipment and operates on audio
fail.
Chapter 10 - RB-SD1 Silence Detection Unit
10-6 Redbox User Handbook
10.4. Front Panel Selectors and Indicators
Fig 10-4: RB-SD1 Front Panel
10.4.1. Source Select and Indicator
The normal Main input source is selectable via a push switch accessed via a hole
located on the front panel, or it can be controlled remotely (pins 13 and 14). This
allows you to define whether input A, or input B is going to be your Main audio input.
There is an LED to indicate which state the source select is set:
LED Description
LED On Main source is input A, Aux source is input B
LED Off Main source is input B, Aux source is input A
Note : If the unit is powered off, for example during a black-out, input A routes
through to the output. Therefore if the unit is subject to a power fail while the main
source is set to input B, the unit will output source A.
10.4.2. Mode Selector and Indicator
The Mode Switch defines how the unit should operate during an alarm condition,
when the main audio source returns. There is an option to allow the device to switch
back Automatically or Manually. The mode is selected by a push switch accessed
through a hole on the front panel with a corresponding LED to represent its state, or
it can be controlled remotely (pins 5 and 6).
LED Description
LED On Automatic Mode – During an alarm condition when the main source
returns, it is switched back automatically, although there must be
a continuous signal present for two seconds before it switches.
LED Off Manual Mode – When the alarm condition is reached, the LED
begins to flash.
LED Flashing Manual Mode – The main audio has returned after an alarm
condition. To switch to the main source, push the Restore button
(or control it remotely).
RESTORE
ALARM
MODE
AUTO
SOURCE
MAIN B
LED ON
LED OFF
LED FLASH
MAIN A
PRESS RESTORE
MANUAL NORMAL
MAIN
ALARMALARMPROG PROG
LEFT RIGHT LEFT RIGHT
AUX
A
LARMALARMPROG PROG
RB-SD1
SILENCE DETECT
10.4.3 10.4.1
10.4.2
10.4.4
Chapter 10 - RB-SD1 Silence Detection Unit
Redbox User Handbook 10-7
10.4.3. Main and Aux indicators
On the front panel there are four Main indicators and four Aux indicators. Each
left/right channel has a Program Content and Alarm Status indicator. The Program
Content Indicator represents the input signal level for that channel and the Alarm
Status LED indicates when the channel has dropped below the threshold for longer
than the time selected.
Both the Main and Aux inputs are continuously monitored so that you can check that
your backup signal is operating correctly, as well as your main input source.
Note: Although one channel of the stereo input may have alarmed, the main alarm
may not be set, due to the setting of the Stereo/Mono Dipswitch.
10.4.4. Alarm Indicator
The Alarm indicator situated on the front panel is used to display the alarm status of
the Main input. Its operation is dependant on the selected mode. When in stereo
mode the unit alarms on a single main channel timeout, and in mono, alarms on both
main channels timing out. The unit exits the alarm state on the return of the main
source signal, depending on the setting of the Stereo/Mono Dipswitch. The alarm
indicator is remotely indicated on pins 1 and 2 of the remotes connector.
10.4.5. Restore Button
The restore button is used for restoring the main source signal when the unit is
operating in Manual Mode. When the main source signal returns after it has timed
out, the Mode LED flashes, indicating that the source signal can be restored. When
the Restore button is pressed the main source returns. This can be remotely
controlled using pin 7 of the remotes connector.
10.4.6. Additional Modes
An option to set the unit in different modes of operation is available and is selectable
when the unit is powered on. There are currently four modes of operation, and are as
follows: Normal Mode, Remote Stop Mode, Remote Alarm Set Mode and Signal
Detection Mode: -
Normal Mode is as described previously for normal machine power-up.
Remote Stop Mode operates as follows. When the main source returns from an
alarmed state, pin 4 on the remote connector (Aux Alarm NC) closes to Pin 11 (Aux
Alarm Common) for half a second. (Note: this will only occur when the Remote Start
Mode Switch is set on (page 10-4) and whilst in Remote Stop Mode, the Aux alarm is
not available to indicate the presence of audio on the auxiliary input).
Remote Alarm Set Mode operates as follows. When the RESTORE pin on the remote
connector (pin 7) closes to the DIGITAL GROUND pin on the remote connector (pin 8)
the unit will immediately enter an alarmed state and switch to the auxiliary input.
Chapter 10 - RB-SD1 Silence Detection Unit
10-8 Redbox User Handbook
This alarm state is continued until the RESTORE pin opens to the DIGITAL GROUND
pin. After this the unit will switch back to the main input when audio is present.
NOTE: When operating in manual mode, restoration of output from the main input is
only available via the front panel restore switch. All other functions operate as
normal.
Signal Detection Mode In this mode the three controls, source, remote source,
mode, remote mode, restore and remote restore have no effect.
The count in time for the signal detection is zero, i.e. as soon as signal is detected on
an input the relevant relay will switch. The relays operate the same as in normal
mode, i.e. when audio is detected on the main input, pin 1 on the remote connector
closes to pin 9. When audio is lost on the main input, pin 2 on the remote connector
closes to pin 9. All other functions operate as with normal mode.
To set the different modes
Apply power to the unit, and while the front panel ALARM LED is flashing, press and hold
the RESTORE button. The MAIN LEFT PROG, MAIN LEFT ALARM, MAIN RIGHT PROG and
MAIN RIGHT ALARM LED’s should now be flashing alternately. To select Normal Mode
release the RESTORE button while the MAIN LEFT PROG LED is on. To select the Remote
Stop Mode release the button while the MAIN LEFT ALARM LED is on. To select Remote
Alarm Set Mode release the button while the MAIN RIGHT PROG LED is on. To select Signal
Detection Mode release the button while the MAIN RIGHT ALARM LED is on.
After the button is released the unit will start working after five seconds. You only
have to do this once as the mode is stored in non-volatile memory and you will only
need to repeat this procedure if you wish to select a different mode. Each time the
unit is powered on; the selected mode is visible by checking which LED is:
MAIN LEFT PROG LED on = Normal Mode
MAIN LEFT ALARM LED on = Remote Stop Mode
MAIN RIGHT PROG LED on = Remote Alarm Set Mode
MAIN RIGHT ALARM LED on = Signal Detection Mode
Chapter 10 - RB-SD1 Silence Detection Unit
Redbox User Handbook 10-9
10.5. Technical Specifications
10.5.1. Audio Specifications
Maximum Input Level: +28dBu
Input Impedance: > 100kΩ balanced
Maximum Output Level: +28dBu
Output Impedance: As input, except when using unbalanced auxiliary input
where output impedance < 50Ω
Frequency Response: 20Hz to 20kHz ±0.1dB
Gain: +12dB (for unbalanced input B – optional)
Noise: <-87dB, unity gain, ref +8dBu output for unbalanced
input.
Distortion: As input for balanced input, <0.05% ref +8dBu output for
unbalanced input.
10.5.2. Connections and Rear Panel Controls
Inputs (Main & Auxiliary): 4 x XLR 3 pin female (balanced, auxiliary can be
unbalanced)
Output: 2 x XLR 3 pin male (balanced)
Remotes: 15 way D-type plug
Power: Filtered IEC, 110-120V, or 220-240V switchable, fused, 6W
maximum
Alarm Threshold: -15dBu to -60dBu in 3dB steps via rotary switch
Silence Detect Duration: 2 sec to 30 sec in 2 second intervals and 125 second
option via rotary switch
Detection Type: Mono or stereo, via dipswitch
Silence Switch Defeat: Disable/enable silence switching, via dipswitch
Remote Start Mode: Latched or momentary, via dipswitch
10.5.3. Front Panel Controls and Indicators
Controls: Source select, mode select and restore
Indicators: Program and alarm indicators for left and right source for
both main and auxiliary channels
Source, mode and restore LEDs
10.5.4. Equipment Type
RB-SD1: Silence detection unit
10.5.5. Physical Specifications
Dimensions (Raw): 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
Dimensions (Boxed): 53cm (W) x 20.5cm (D) x 6cm (H)
Weight: Nett: 1.4kg Gross: 2.0kg
Chapter 10 - RB-SD1 Silence Detection Unit
10-10 Redbox User Handbook
Chapter 11 - RB-PMX4 10 Input, 4 Output Analogue Preset Mixer
Redbox User Handbook 11-1
11. RB-PMX4 10 Input, 4 Output Analogue
Preset Mixer
Fig 11-1: RB-PMX4 Front Panel
11.1. Introduction
The RB-PMX4 is a high performance 10 mono input to 4 mono output preset mixer.
Each of the four outputs has a 10 way DIP switch associated with it to select which of
the 10 inputs are routed to it. So, by altering the DIP switches, any of the input
sources can be mixed to any of the outputs. The DIP switches are enclosed by a
screw-on cover on the front panel so that the settings can not be accidentally changed
for secure applications.
The RB-PMX4 has been designed for situations where a small mixer is needed for
installations where it will be configured and then only altered occasionally, or never
altered. Uses for this product are numerous including a four bus mini-mixer, a 4 zone
mixer for pubs and clubs, a multiple clean-feed generator and a quad stereo to mono
converter to name a few.
The XLR-3 inputs and outputs are electronically balanced and can be wired
unbalanced. Each output is individually buffered so that a short circuit on one won't
affect the others. Each input has its own gain control which is a pre-set potentiometer
accessible through the front panel. This provides gain adjustment of -8dB to 18db.
This is useful for normalizing consumer and professional signals to give outputs of -
15dBu and 0dBu respectively.
The front panel is held on by 2 off M3 x 6 stainless steel dome-head screws and can
be removed using a 2mm AF hex key (allen key). Each 10-way switch represents an
output and the individual switches represent the inputs that will be mixed to that
output. Switches are in the ON (down) position to be mixed and the OFF (up) position
for off.
The XLR-3 outputs are electronically balanced and can be wired unbalanced. Each
output is individually buffered so that a short circuit on one won’t affect the others.
An LED power indicator on the front panel displays the power supply connection.
RB-PMX4
PRE-SET MIXER
INPUT LEVEL
1 2 109876543
Chapter 11 - RB-PMX4 10 Input, 4 Output Analogue Preset Mixer
11-2 Redbox User Handbook
11.2. System Block Diagram
Fig 11-2: RB-PMX4 Block Diagram
Output 1
Switch Bank
Gain
Gain
Gain
Gain
Gain
Gain
Gain
Gain
Gain
Gain
Output 2
Switch Bank
Output 3
Switch Bank
Output 4
Switch Bank
Balanced XLR
Output 1
Balanced XLR
Output 2
Balanced XLR
Output 3
Balanced XLR
Output 4
Balanced XLR
Input 1
Balanced XLR
Input 2
Balanced XLR
Input 3
Balanced XLR
Input 4
Balanced XLR
Input 5
Balanced XLR
Input 6
Balanced XLR
Input 7
Balanced XLR
Input 8
Balanced XLR
Input 9
Balanced XLR
Input 10

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Kategória: nincs kategorizálva
Modell: Redbox RB-UL2

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