BSS Audio OPAL Series DPR-944 Owner's Manual - Manual (Page 22)

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Control operations - Compressor
9.0 Control Operations - Parametric
compressor
9.1 Comps in
When the Comps In switch is in the out, non illuminated position, all DPR 944
compressor functions are bypassed, and the input is connected directly to the
output with a high quality relay. This is the same condition that occurs when
the power is off, and ensures that signal is passed through the unit in the case
of a power or fuse failure. When the switch is pressed, the processed signal is
present on the output.
In bypass mode, the input is still connected to the DPR 944 compressor
circuitry, so that all of the required facilities can be selected and set up.
9.2 Threshold
This control sets the signal level that is required to invoke compressor
operation. If a signal is below threshold, the DPR 944 will not compress it
(although the gain control will still change its level). The amount that an input
signal is below the compression threshold is displayed on the below threshold
meter. Rotating the threshold control anti-clockwise brings a signal closer to,
or takes it above the threshold level.
Once the input signal is above the threshold level, as indicated by the ‘TH’
segment of the below threshold meter illuminating, gain reduction or
compression will occur. The amount of signal reduction is indicated on the
gain reduction meter. What actually happens to the sound when the level is
above threshold is to a large extent governed by the ratio control setting.