User`s guide

12 LEVELS

The plug-in card provides the necessary filtering, EQ, channel gain or

attenuation to provide approximate system balance when the level control

is in the 0dB position, (assuming the use of amplifiers with identical gains).

The level control can provide 6dB’s of gain or attenuation on channels 2

and 4, to adjust the balance of the system when using different ratios of

sub bass cabinets to top boxes.

Please note the AQX controller will always be shipped with the level control

set in the 0dB position. The screwdriver ‘slot’ in the end of the spindle is un-

calibrated and does not correspond to any particular level.

13 LIMITERS

Each AQX output has an associated limiter,

which provides momentary gain reduction when

the output signal level exceeds a pre-set

threshold value. A red LED indicates the onset of

limiting. Threshold settings for the limiters may be

adjusted by first disconnecting the power to the

AQX, then removing the top cover (two screws

on each side). The plug-in card must then be

un-clipped from the four locating pillars and

swung up on it’s ribbon cable to reveal the four

banks of selector pins J11, J12 J13, and J14.

Threshold values corresponding to the jumper

link positions are printed on the lid of the

controller and duplicated below.

Each output channel limiter sets a maximum

voltage level from the AQX, which in turn sets the

maximum continuous voltage that the amplifier

can present to the loudspeaker.

The limiters in the AQX may be used to control

the average continuous power applied to the

loudspeakers, if power amplifiers with a higher

maximum power rating than that recommended

are used. (See Amplifier section). Alternatively, if

the loudspeakers selected will handle the full

rated power, or if maximum system headroom is

required, the limiters may be set to prevent the

amplifiers being driven into hard clipping.

Martin Audio – AQX Controller

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