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DUAL/STEREO COMPRESSOR/NOISE GATE CN-220
the signals above the level defined at the threshold control will be compressed in
correspondence with the compression ratio control adjustment. The threshold range control
varies from -40 to +20 dBu.
COMPRESSION RATIO CONTROL
The compression ratio controls the amount of compression, which will happen
once the input signal crosses the threshold level. Its adjustment determines the
number of dB that the input signal should increase, in order to increase a dB the
output signal, whenever the input signal cross the threshold level. For example, if we
adjusted the compression ratio control to 4: 1, the variation of 4 dB in the input signal will be
reflected in the output as only 1 dB variation. A variation of 8 dB, will produce 2 dB of variation,
etc.
If we adjusted the compression ratio control to 1: 1, the input signal won't be modified for
the compressor, for what we will have a compressor BYPASS, and the threshold control won't
affect.
Adjusting the compression ratio to
∞
:1, the compressor will work like a limiter, that to say,
the output signal will never overcome the threshold level adjustment, no matter how much
above the threshold the input signal goes.
GAIN REDUCTION VUMETER
The gain reduction produced by the input signal compression, it is indicated in
this vumeter, allowing us in all moment the visualisation of the compressor action.
This vumeter is composed by 8 LED’s (30, 20, 15, 12, 9, 6, 4 and 2 dB).
BYPASS SWITCH
When we press this compressor bypass switch, the compressor will be disabled
and the controls and switched won’t be operative. The gain reduction vumeter will turn
off indicating that the input signal is not compressed. This switch is totally independent of the
noise gate BYPASS.
COMMON
OUTPUT LEVEL CONTROL
The output level control, allow to attenuate or amplify the output signal of- 15
to +15 dB. This control is useful for making up gain which was reduced by the
compression or matching the input level of a mixer or recorder. This control is
enabled although the BYPASS switches of the noise gate and the compressor are
pressed
OUTPUT LEVEL VU-METER
The output level is indicated constantly by this vu-meter, compound for 12
LED's (30,- 20,- 12,- 8,- 4,- 2, 0, 2, 4, 8, 12 and 16 dB). The red 16 dB LED
indicates that we have a high level in the output, however, to this level the unit
is not saturated still, since it has a "headroom" of 5 dB.
If we want to know the signal input level, we will press the noise gate and compressor
BYPASS switches and we will locate the output level control to 0 dB (centered), and this vu-meter
will indicate us directly the input level.
