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Key Input
A Key Input is provided to allow adjustable control from an external
source. Like the sidechains the key input has a threshold level
control ranging from -20 to +16 to set the intended level at which
compression control is required.
It can be used in several ways:
q
Injecting tone to provide a remotely variable base-level of
compression on one or both sidechains.
q
'Ducking' from an audio source such as dialogue.
q
When connected in parallel with one of the inputs, it allows
that input to be routed onto both sidechains with different
compression thresholds.
Key Filter
The key input is provided with a selectable 12dB/octave high-pass LFE filter, fixed at 100Hz.
Bias Control
The bias control is used to balance the control voltages from the two sidechains by applying up to
6dB of cut and boost, effectively modifying their ratios.
If only a single sidechain is in use, for example when used as a stereo compressor, the bias control
allows ratio values between the standard settings to be selected with continuously variable control.
Output Level
This control provides a variable active pad across all six outputs, from 0dB to -5.5dB in 0.25dB
steps. The pad is outside of the relay bypass loop and so always controls all six channels together in
order to maximise the unit's output level without clipping.
Power
The power switch is illuminated dim red when the mains is present to indicate that the unit is in
standby mode. While in standby all switches are disabled, switch settings are retained and the unit
consumes minimal power.
Pressing the power switch brings the unit out of standby (power switch illuminates green). Pressing
and holding returns it to standby mode.
-
The unit can be brought out of standby remotely by connecting pins 1 and 12 on the rear panel
D-Type connector.
8051 5.1 Compressor User Guide
Issue 2 Page 12
OUTPUTLEVELdB
0-55.5
0
-20 +16
8
8
12
12
16
4
4
0
DISCRETE
0-5.5
A
B
A/B
BIAS
0
POWER
KEYI/P
A
B
100Hz
THRESHOLDdBu
0-5.5
0
-20 +116
8
8
12
12
16
4
4
0
DISCRETE
-20 +16
8
8
12
12
16
4
4
0
SIDE
CHAIN
SEL
IN/OUT
8051
MULTI-CHANNEL
COMPRESSOR
DISCRETE