Használati útmutató Martin Mach M20.02

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Letöltés PDF
Oldal 1/12
MS 3
M20.02
M20.03
Audio Controller
user manual
2 M20.02, M20.03, and MS 3
s e c t i o n 1
I N T R O D U C T I O N
S a f e t y P r e c a u t i o n s
• Read this manual before operating the controller.
• To avoid the risk of electrical shock, do not remove any cover from the controller while it is connected to AC power.
• Do not expose the controller to rain or moisture.
G e n e r a l p r e c a u t i o n s
• Do not operate the controller near heat sources such as radiators, etcetera.
• Connect only to a power supply as marked on the controller.
• Do not drop the controller.
• Do not spill liquids onto or into the controller.
• Refer all service to a qualified technician.
Te c h n i c a l B a c k g r o u n d
When working with loudspeakers, there are 5 decisive factors for maximizing sound quality speaker lifetime:
• excursion control
• input power control
• frequency segmentation
• controller-generated distortion
• controller-generated noise
To avoid mechanical damage to the speaker units, the excursion of the speaker cones must be controlled. The M20.02,
M20.03, and MS 3 accomplish this with a subsonic filter and limitation.
To avoid electrical damage to the speaker units, the power sent to the voice coils must be controlled. The M20.02, M20.03, and
MS 3 use limiters for this purpose.
To get the best sound, the speaker units must be driven within the proper frequency range. This is accomplished by the cross-
over in the M20.02, M20.03, and MS 3. In addition, the controller must not add distortion to the system.
To get the best signal to noise ratio, the noise floor of the controller must be below the general noise. This is achieved by sur-
face mounted device (SMD) technology on double-sided printed circuit boards.
© 1998 - 2001 Martin Professional A/S, Denmark.
All rights reserved. No part of this manual may be
reproduced, in any form or by any means, without
permission in writing from Martin Professional A/S,
Denmark.
Printed in Denmark.
P/N 35020000, Rev. H
M20.02, M20.03, and MS 3 Design Concept 3
s e c t i o n 2
M20.02, M20.03, AND MS 3 DESIGN CONCEPT
The subsonic filter is a 24dB Butterworth for maximum sound quality and security.
The crossover filter configuration is a 24dB Linkwitz-Riley to get the best electronic summation of the crossover points and to
optimize amplifier power.
The feedback sense is electronically isolated from the controller signal to get the lowest noise and highest security for the
amplifier.
The inputs and outputs are built as electronically servo-balanced transformers.
The components used in the controller are selected for audio quality, reliability, minimum distortion and noise.
In addition, the 20.03 includes an adjustable high-pass equalizer to pre-equalize the loudspeaker horns for correct frequency
response.
M 2 0 . 0 2 B l o c k D i a g r a m
Input stage: The input signal first passes through an electronically balanced input stage and is then simultaneously directed to
the low pass (LP) and high pass (HP) section.
Low pass section: The signal is first subsonically filtered with a 24dB Butterworth high pass filter. Thereafter the signal is fil-
tered to its crossover point with a 24dB Linkwitz-Riley low pass filter. The signal then passes through the limitation section to
the electronically servo-balanced output stage.
High pass section: The signal is first filtered to its crossover point with a 24dB Linkwitz-Riley high pass filter. The signal
then passes through the limitation section to the electronically servo-balanced output stage.
The sense input on the controller measures the amplifier output directly. If the signal is too high compared to the settings of the
internal DIP-switches, the signal to the amplifier will be reduced.

Termékspecifikációk

Márka: Martin
Kategória: nincs kategorizálva
Modell: Mach M20.02

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