8
Front Panel Description and Controls (cont.)
4. IN/OUT button - This switch enables you to quickly
hear the CLG-600 compressor/limiter IN or OUT of the
audio chain. When the switch is in the OUT position,
all limiting and compression controls and functions
are bypassed, with the exception of the gain and
output controls, which continue to function as
straightforward level controls.
5. THRESHOLD control - The THRESHOLD control
has a range of -40dB to +20 dB, allowing applications
from low level compression to high level limiting. The
THRESHOLD control determines the audio level above
which GAIN REDUCTION occurs. When the
THRESHOLD LED comes on, that means that GAIN
REDUCTION is beginning to occur, due to input signal
peaks exceeding the selected threshold in dB.
6. RATIO control - This control determines the RATIO
of change in output level to changes in input level
for all signals above threshold. The numbers printed
around the RATIO control are calibrated in dB and
indicate the increase in input (above threshold)
required to produce a 1db increase in output. This
can be expressed conveniently as a ratio. If the
output remains constant no matter how high the
input level, we have an infinite input/output ratio.
NOTE: It should be remembered that the RATIO
control has no effect on signals which are below
threshold. There is a common but incorrect
notion that limiting always implies the use of an
infinite ratio. Although there are times when an
infinite ratio is desirable, there will be situations
where infinite, or "hard", limiting action is neither
appropriate nor necessary.
7. ATTACK control - ATTACK controls how fast the
compressor reacts to signals passing over the
threshold point. The available range is from 0.1 to
200 ms. This control when used correctly creates
either a smooth or abrupt signal process.
8. RELEASE control - The RELEASE control
determines how fast or slow a compressed
segment returns to its original volume. The
available range is from .05 to 4 seconds. This
control when used correctly creates either a
9. AUTO/MANUAL switch - By activating the AUTO
switch to the ON position, the attack and release
controls are handled by the CLG-600
automatically. When it is set to the MANUAL
position, the attack and release controls will
adhere to settings of the controls in place. This
allows for unobtrusive musical compression with
widely varying dynamics to occur without
"manning" the sound system.
10. OUTPUT LEVEL control - OUTPUT Level control
is provided to fully cut or restore up to -/+ 20 dB
of system gain. For unity gain, set the control to 0.
NOTE: When the unit is in the BYPASS mode the
output control still functions.
11. GAIN REDUCTION meter - This 8-stage LED
meter indicates the actual GAIN REDUCTION
processing level and displays this in range
of 0-30 dB.
12. LEVEL EXPANSION meter - This 8-stage meter
indicates the actual LEVEL EXPANSION level and
displays this in a range of -30dB to +6dB.
LEVEL
THRESHOLD
dB
MANUAL
AUTO
COMPRESSOR/LIMITER
RATIO
M1
RELEASE
Sec
OUPUT
dB
CH 1
30 27 24 21 18 15 12 9 6 4 2 1
GAIN
OUT
-30 20 -10 -5 -3 0 +3 +5
+20
+10
0
-10
-20
-30
-40
2.5
1
1.5
8
200
2.5
0.1
4
.05
0.5
-20 +20
0
OFF
msec
IN
4
5
6
7
8
9
10
11
12
(28 pages)
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