Manual-2
INPUT LEVEL control
This controls the overall level. Unity gain is
reached at “0”. With signal applied, set this
control so the +4 dBu LED lights occasion-
ally. If the OL (overload) LED flashes, turn
the INPUT LEVEL control down.
THRESHOLD control
This control sets the point at which the Input
signal level causes the Compressor to
become active. See Figure 1 on page
Manual-4.
COMPRESSOR
ACTIVE/BYPASS switch
This switch compares compressed and non-
compressed signal. There is one for each
Channel. The INPUT LEVEL remains active
regardless of switch position.
adx
LED
This illuminates whenever noise reduction is
active. This automatic downward expander
circuit acts like a gate to keep the system
quiet when no signal is present. When the
input level drops below -55 dBu, downward
expansion occurs at a ratio of 2:1. See
Figure 3 on page Manual-5.
RATIO control
Once the threshold is exceeded, the ratio of
input change to output change is determined
by this control. The compressor has no
effect when set at 1:1. But at 10:1, it takes
a 10 dB input signal increase above the
Threshold to produce a 1 dB increase in
Output Gain. See Figure 2 on page
Manual-4.
GAIN REDUCTION LEDs
These LEDs show the amount of average
signal reduction in dB. This aids in setting
the THRESHOLD and RATIO controls by
showing how much compression is occuring.
CHANNEL 2 OUTPUT
Same as Channel 1 Output.
CHANNEL 2 INPUT
Same as Channel 1 Input.