Owner`s manual

16
QUAD COMP/GATE
QUAD-COMP/GATE
17
Owner’s Manual
Owner’s Manual
36. BYPASS button
This button will bypass the selected channel’s com-
pressor, and the audio will pass through unaffected by
the compressor controls. (This does not affect the Gain
Reduction metering.)
37. GAIN knob
This allows you to adjust the amount of make-up gain
applied to the current channel. Make-up gain is used to
return the compressed signal to it’s original level and
place in audio society, once it has been compressed.
The reduction meters will help you see how much the
overall level is reduced during compression, and your
ears will help you bring the level back up to match your
other instruments or microphones etc. The gain adjust-
ment ranges from 0 dB to 20 dB.
Compressor Key Filters
The compressor’s detector circuit receives a copy of
the incoming signals, detects when compression should
occur, and applies the compression and all its param-
eters to the incoming signals.
The key lter is placed before the detector, so you can
adjust the signals reaching the detector. For example,
you can adjust it so the compression will not be trig-
gered by the bass thumping, but it will if there are
certain peaks above the threshold in the vocal range.
(The frequency and bandwidth controls are only applied
to the signal going to the detector and not to the main
audio output.)
Note: If the SIDECHAIN [35] button is engaged, the
signals going into the SIDECHAIN RETURN [4] for the
selected channel will be used to trigger the compression
instead of the channel input. The key lter is still in
operation if ON [38] is pressed in.
38. ON button
This button engages or disengages the key lter
circuit. This allows you to quickly compare the action of
the key lter on compression.
When this button is out, the key lter knobs will have
no effect on the compressor.
39. CENTER FREQ knob
This allows you to sweep the audio band with a lter
whose bandwidth is selected by the BANDWIDTH [40]
knob. Press this knob for 2 seconds to listen to the
key lter only, as you boldly seek out frequency ranges
containing peaks, or parts that could use some compres-
sion. Then the selected range will be used to detect
when compression is triggered on your channel signal.
The control ranges from 20 Hz to 20 kHz.
40. BANDWIDTH knob
The width control will change the bandpass lter to
allow for a wider or narrower frequency range to be used
as the key lter.
Compressor Key Filter listen
Pressing and holding either key lter knob in for two
seconds will illuminate the bottom LED of the knob,
and place the channel in key lter listen mode. In this
mode the channel will output only the compressor’s key
ltered signal, allowing you to quickly identify target
frequencies by ear.
For an example of how to use the key lter, suppose
you have the compressor connected using channel in-
serts (as in gure 1 on page 6). It receives the individu-
al channel signals and sends them back to your mixer:
1. On your mixer, remove the channel from the
main mix.
2. Solo that channel to the headphones.
3. Engage the key listen by pressing and hold-
ing either of the key lter knobs on the Quad
Comp/Gate for 2 seconds.
4. Use the key lter frequency and width controls
to identify the frequency range to trigger com-
pression.
5. Make appropriate compressor parameter ad-
justments (i.e. tweak ‘til it sounds good).
6. Adjust the make-up gain to compensate for the
gain reduction due to compression.
7. Disengage the key listen.
8. Bring the signal back into the mix.
INPUT
OUTPUT
LEVEL DETECTOR
AND CONTROLS
KEY FILTER
INPUT
OUTPUT
LEVEL DETECTOR
AND CONTROLS
KEY FILTER
SIDE
CHAIN
INPUT