ART Pro Audio SCL2 - Dual / Stereo Compressor / Limiter Expander / Gate - Manual (Page 10)

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The Channel 1 knob always controls the output level of Channel 1, but can also serve as a master output
level when the Link Mode is active.
The Channel 2 LEVEL control operates as a standard Channel 2 level control in Dual mode or as a balance
control when Link Mode is active. In Link Mode when the BALANCE control is turned fully counter-clockwise
the Channel 1 output is fully on and Channel 2 output is muted 20dB. When centered, both channels have
equal gain. When turned fully clockwise the Channel 2 output is fully on and Channel 1 output is muted 20dB.
The Expander/Gate Switch
The Expander/Gate switch selects the slope of the noise reduction section. The out position of the switch
selects the gate mode. This quickly acts to either pass or attenuate the audio signal to reduce the background
or system noise.
Depressing the switch selects the expander mode, providing a smooth application of noise reduction below
the selected threshold. This mode works best with instruments that you to need hear fade off gradually.
The Expander/Gate Threshold Control
The Expander/gate Threshold control adjusts the input level below which noise reduction takes place. This
control is adjusted in conjunction with the yellow Gate Threshold LED adjacent to the Output Meter. The LED
lights when there is at least 0.5dB of output attenuation in expander mode or the gate is attenuating the output
in gate mode.
Compressor Attenuation LED Meter
The attenuation meter displays the SCL2™ compressor/limiter action. The meter covers a very large range
while offering high resolution. The yellow (0) LED illuminates when the input signal reaches or exceeds the
compressor detector threshold setting (Threshold control) and results in a reduction of 0.5dB or more.
Output Level LED Meter
This meter displays the signal level present at the output of the unit. "0" on the meter corresponds to 0dBu
(.775 VRMS) at the output jacks.
The Link Switch
The two channels of the SCL2™ can be configured for stereo operation by depressing the LINK switch. Link
Mode connects the gain reduction of the two channels together for stereo operation. The Detector signals of
the two channels are summed so either channel's signal can trigger gain reduction. Channel 1's controls
(THRESHOLD, RATIO, ATTACK, RELEASE, NR THRESHOLD) become the master and Channel 2's controls
are ignored. The Channel 2 OUTPUT LEVEL control becomes an output balance control. Link Mode ensures
that each channel of the stereo input signal is processed identically to prevent any shifting or distortion of the
stereo image.
Bypass switches remain independent in link mode.