Power Amplifier Requirements; Cmx1A/Cmx2A/Cmx3A Operation - Martin Audio Screen Channel Manual

Cinema series

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CONTENTS

6.2

Martin Audio Screen systems are designed to be used with professional

power amplifiers capable of producing 400-650 watts per channel into 4

ohms.

Lower power amplifiers than those recommended may be used if care is

taken to avoid amplifier clipping, although they will not allow the full

performance of the system to be realised. It is important to understand that

a low power amplifier driven into clipping is more likely to damage a

loudspeaker than a higher power amplifier used within its ratings. This is

because music signals have a high peak-to-average "crest" factor. When

an amplifier is severely overdriven its output waveform is clipped (its peaks

are squared off) - reducing the crest factor. In extreme cases, the waveform

can approach that of a square wave. An amplifier is normally capable of

producing far more power under these conditions than its undistorted rated

power output.

The CMX1A cinema controller is a 3 input/6 output controller used to

optimise the performance of the Martin Audio Screen 4 bi-amped system.

The CMX2A is the corresponding controller for the bi-amped Screen 5B.

Likewise the CMX3A is the corresponding controller to the Screen 2 bi-

amped system.

The controller provides the correct crossover, delay and screen

compensation equalisation. The nominal through gain of the controller is

0dB at the centre position of the trimpot, plus and minus 6dB of gain

variation is available to optimise the relative levels of the bass and mid/high

outputs per channel. All six trimpots are accessible through the front panel.

Power Amplifier Requirements

Martin Audio – CINEMA SERIES

GUIDES

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