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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
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Read this manual before operating the controller.
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To avoid the risk of electrical shock, do not remove any cover from the controller while it is connected to AC power.
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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
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Do not operate the controller near heat sources such as radiators, etcetera.
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Connect only to a power supply as marked on the controller.
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Do not drop the controller.
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Do not spill liquids onto or into the controller.
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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:
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excursion control
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input power control
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frequency segmentation
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controller-generated distortion
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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.
