User`s guide

WARNING: Care should be taken to avoid amplifier clipping. 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 normal undistorted rated power output. Correct setting of the limiters will

automatically avoid amplifier clipping and prevent damage occurring to the

loudspeakers.

Each limiter may be completely defeated by setting J7, J8, J9 and J10 to

the out position. WARNING This should only be done in special

circumstances where another controller or compressor limiter is to be

driven from any of the output channels of the AQX. The limiters should then

be defeated on those channels to prevent them operating before the

limiters in the following equipment.

Martin Audio recommends that the AQX controller is always used with the

limiters ‘IN’ and can accept no responsibility for loudspeaker or amplifier

damage due to defeating the protection limiters.

The use of very high power amplifiers with outputs significantly greater than

those recommended is discouraged.

Care should be taken to avoid switch on surges, which can result in

momentary power peaks in excess of specified ratings. When powering up

a sound system it is important to switch on the amplifiers after the mixer

and control electronics have stabilised. When powering down the system,

reverse the sequence and switch off the amplifiers first.

Martin Audio – AQX Controller

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