Solid State Logic XLOGIC SUPERANALOGUE X-RACK Owner's Manual page 93

N. Stereo Dynamics Module
N.1 Connection
IN
L R
KEY
OUT
L R
N.2 Operation
The X-Rack Stereo Dynamics module comprises a compressor/limiter and a
gate/expander, both of which use the same gain element.
The IN button
N.2.1 Compressor/Limiter Section
RATIO – When turned to 1:1, the compressor/limiter section is inactive. Turning
the control clockwise increases the compression ratio, giving a true limiter at the
fully clockwise position. The compressor normally has an 'over-easy' characteristic.
Pressing the PK button switches this to peak sensing, and replaces the 'over-easy'
characteristic with a hard knee.
THRESHOLD – Whenever a signal exceeds the level set by this control, the
compressor will start to act at the ratio set by the RATIO control. The
THRESHOLD and RATIO controls also provide automatic make-up gain, so as
you lower the threshold and introduce more compression, the output level is
increased to maintain (approximately) the same perceived loudness regardless of
the amount of compression.
FST ATT – Normally the attack time is program dependent (3mS – 30mS). Press this
button to select a fixed fast attack time (3mS for 20dB gain reduction).
RELEASE – Sets the time constant (speed) with which the compressor returns to
normal gain settings once the signal has passed its maximum.
N.2.2 Gate/Expander Section
This section can act as a ∞:1 Gate or as a 2:1 Expander when the EXP button is
pressed.
RANGE – Determines the depth of gating or expansion. When turned fully
anticlockwise (Range = 0), this section is inactive. When turned fully clockwise, a
gate depth of 40dB can be obtained.
THRESHOLD – Determines the level at which the gate opens or below which gain reduction begins (EXP
selected), adjustable from +10dBu to –20dBu. Variable hysteresis is incorporated in the threshold circuitry
to prevent spurious triggering of the gate when the signal is close to the threshold level. This means that
the signal has to decay roughly 2dB below the threshold level before the gate will start to close.
The module inputs and outputs are balanced, connecting via ¼" stereo jack sockets. A
single Key input is provided, also connected via a ¼" stereo jack socket. The module is
configured to operate at a nominal level of +4dBu; operation at a nominal –10dBV
level is not possible with this module.
switches the entire section in and out of circuit.
2
3
X-Rack Stereo Dynamics Module
XR728
SEL
RATIO
•
1
2
RELEASE
0.1 4
KEY
RANGE
0 40
EXP
3
RELEASE
0.1 4
LINK
IN
COMPRESSOR
PK
THRESHOLD
0
-20
+10
FAST
ATT
20
14
10
6
3
GATE/
EXPANDER
THRESHOLD
0
-30 +10
FAST
ATT
HOLD
0 4
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