Crane Song STC-8 - Manual (Page 9)

CONTROL DESCRIPTION (Cont.) PAGE 7
the top of the graph. If the shape control is changed to 10, the STC-8 follows the lower group B curve with
18db of gain reduction when the input is at +25dbm.
The shape control settings will influence the attack and release time because of how the gain relationship
changes. In addition to the times, the shape of the attack and release envelopes also change.
In the graph at left, two groups of curves
show gain reduction, groups A and B.
In group A group A group A group A group A with the input at +25dbm and the
shape control set at 0, the compressor has an
input/output gain relationship that follows the
upper curve with 10db of gain reduction at
the top of the graph. If the shape control is
changed to 10 the STC-8 follows the lower
group A curve with 12.5db of gain reduction
when the input is at +25dbm.
In group B group B group B group B group B with the input at +25dbm and the
shape control set at 0, the compressor has an
input/output gain relationship that follows the
upper curve with 14db of gain reduction at
A
B
INPUT/OUTPUT GAIN RELATIONSHIP GRAPH (Graph 1)
SHAPE CONTROL
The shape control changes the gain curve, the relationship between amount of gain reduction
taking place and the signal level. The input to output ratio changes as a result of this. With the
control set to 0 the curve and slope are gentle. With the control set to 10 the curve is more
aggressive and the slope is higher.
INPUT/OUTPUT GAIN RELATIONSHIP GRAPH - LIMITER (Graph 2)
C
D
E
Graph C Graph C Graph C Graph C Graph C shows the limiter input/output
gain relationship with no no no no no compressor
operation. The Pk Threshold is set at +19
dBm. The graph shows a maximum gain
reduction of 6db when the input is at +25
dBm.
Graph D Graph D Graph D Graph D Graph D shows the limiter input/output gain
relationship with no no no no no compressor operation.
The Pk Threshold is set at +13 dBm. The
graph shows a maximum gain reduction of
11.5db with an input level of +25 dBm.
Graph E Graph E Graph E Graph E Graph E shows a combined compressor-
limiter gain curve. The Pk Threshold is set
at +12 dBm. This is the point where the limiter takes over control from the compressor side chain.
In all three cases there is a slight soft knee when the limiter takes control over gain reduction.