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2-Channel Compressor / Limitter
These operating instructions are intended for
users with basic knowledge in audio tech-
nology . Please read the instructions carefully
prior to operation and keep them for later
reference .
All operating elements and connections
described can be found on the fold-out
page 3 .
Contents
1
Overview . . . . . . . . . . . . . . . 10
1.1 Front panel . . . . . . . . . . . . . . . 10
1.2 Control section of channel A . . . . . . 10
1.3 Rear panel . . . . . . . . . . . . . . . 11
2
Safety Notes . . . . . . . . . . . . . 11
3
Applications . . . . . . . . . . . . . 11
4
Setting Up . . . . . . . . . . . . . . 11
5
Connecting the Unit . . . . . . . . . 11
the channel of a mixer . . . . . . . . . 11
audio units . . . . . . . . . . . . . . . 11
5.3 Using the sidechain connections . . . . 12
5.4 Power supply . . . . . . . . . . . . . . 12
6
Operation. . . . . . . . . . . . . . . 12
6.2 Adjusting the expander / gate . . . . . . 12
6.3 Adjusting the compressor . . . . . . . . 13
6.3.1 Threshold and ratio . . . . . . . . . . 13
6.3.2 Output level . . . . . . . . . . . . . 13
6.3.3 Soft / hard knee . . . . . . . . . . . . 13
6.4 Adjusting the limiter . . . . . . . . . . 14
6.5 SIDECHAIN FILTER . . . . . . . . . . . 14
6.6 Sidechain applications . . . . . . . . . 14
de-esser, expander/gate . . . . . . . . 14
ducker, expander/gate. . . . . . . . . 14
7
Specifications . . . . . . . . . . . . 15
10
1 Overview
1.1 Front panel
1 Control section for channel A (details
see fig . 2)
2 Control section for channel B, corresponds
to channel A except for the VU-meter (11)
which is situated on the left
3 POWER switch with power LED
1.2 Control section of channel A
4 LEDs + / −
LED "+": the input signal is above the
threshold adjusted and remains un-
changed
LED "−": the input signal is below the
threshold adjusted and will be attenu-
ated by the expander
5 Button SC EXT to switch over the side-
chain control signal
button not pressed:
the input signal will also be used as a
control signal for dynamics processing
button pressed:
a signal available at the jack SIDECHAIN
RETURN (34) will be used to control
dynamics processing
When the jack SIDECHAIN RETURN is not
used, the control signal will always be the
input signal .
6 LEDs −/ 0 /+
LED "+": the input signal is above the
threshold adjusted and will be modified
by the compressor
LED "−": the input signal is below the
threshold adjusted und will not be
modified by the compressor
LED "0": when the button SOFT (7) is
pressed, the input signal will be in the
transition area around the threshold
adjusted and will be modified by the
compressor with reduced compression
ratio
7 Button SOFT to influence the compressor
control
button not pressed:
hard start of compression
button pressed:
soft start of compression (soft knee)
8 LED indicators of current level reduction
(compression)
9 LED LIMITER, will light up when the out-
put signal is limited by the limiter
10 LED VU-meter for the input signal or out-
put signal of channel A; 0 dB corresponds
to the rated level adjusted with the switch
+4 dBu / −10 dBV (30)
11 LED VU-meter for the input signal or out-
put signal of channel B; 0 dB corresponds
to the rated level adjusted with the switch
+4 dBu / −10 dBV (30)
12 Control THRESHOLD to adjust the thresh-
old for the expander: If the input signal
exceeds the threshold, the signal will pass
unchanged . If it falls below the threshold,
it will be attenuated with the RATIO (13)
adjusted . In the position OFF, the signal
will remain unchanged .
13 Control RATIO to adjust the expansion
ratio; with a ratio of 4 : 1, for example, a
reduction of the input level by 2 dB below
the threshold will result in a reduction of
the output level by 8 dB
14 Button SC MONITOR to check the con-
trol signal acoustically; if the button is
pressed, instead of the processed signal,
the sidechain control signal will be sent
to the output (28, 29)
15 Control THRESHOLD for the compressor;
to adjust the threshold at which the signal
is to be compressed
16 Button SC FILTER to activate the high-pass
filter for the sidechain control signal
17 Control RATIO to adjust the compression
ratio
position "1":
no compression
position "4":
the ratio is 4 : 1; an input level modifi-
cation of 8 dB above the threshold will
result in an output level modification
of 2 dB
position "∞":
the compressor will operate as a signal
limiter; the output signal will roughly
be limited to the value adjusted with
the control THRESHOLD (15)
18 Control ATTACK to adjust the attack time
of the compressor
19 Selector switch MANUAL /AUTO to adjust
the compressor times
button not pressed:
the adjustment of the controls ATTACK
(18) and RELEASE (20) will define the
attack time and the release time of the
compressor
button pressed:
the attack time and the release time of
the compressor will be automatically
defined as a function of the music
signal
20 Control RELEASE to adjust the release
time of the compressor
21 Selector switch OUT/ IN for the VU-meter
(10)
button not pressed:
the output signal will be indicated
button pressed:
the input signal will be indicated
22 Control OUTPUT GAIN to adjust the out-
put level
23 Button BYPASS / COMP
button not pressed:
the input signal will be sent to the out-
put unchanged
button pressed:
the signal processing will be effective
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