6.2
Power Amplifier Requirements
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.
7
CMX1A/CMX2A/CMX3A OPERATION
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.
Martin Audio – CINEMA SERIES
E
NGLISH
6
All material © 2007. Martin Audio Ltd. Subject to change without notice.
