The unit generates a small amount of heat internally. This heat should be allowed to dissipate by convection
through the grills in the side panels and top cover, which must not be obstructed. Do not locate the unit
where it will be subject to external heating, for example in the hot air flow from a power amplifier, or on a
radiator.
The compressor may be free standing, or mounted in a standard 19” rack.
Rear Panel.
The rear panel connectors are identified in fig.3. Make sure that all settings, mains and audio connections
have been made as described above before attempting to operate the equipment.
OPERATION.
Front Panel.
The front panel controls are identified in fig.2.
Input Gain.
A line level signal should already be at about the correct operating level, but this may be checked by
bypassing the compressor (i.e. turning off the COMP IN switch) and monitoring the level on the bargraph
meter. The INPUT GAIN should be adjusted until the 0dB LED is illuminated on music of normal loudness,
with the red LEDs illuminating occasionally on higher volume peaks.
The front panel auxiliary input sockets may be switched between high level signals (“LO GAIN”, suitable
for active guitars and keyboards) and low level signals (“HI GAIN”, suitable for microphones, pick ups or
passive guitars), and are also controlled by the input gain control.
Compressor Operation.
A compressor functions by reducing the gain of the signal when it exceeds a certain level, or threshold. The
amount of gain reduction may be fairly gentle through to limiting, where the signal is clamped at the threshold
level. The amount of gain reduction is determined by the ratio control, which is calibrated as a ratio of the
output to input signals.
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