AMS 8051 Stereo Receiver User Manual


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Threshold
Threshold is the level above which compression begins. Each
channel linked to a sidechain (using the SC Link buttons) takes
that sidechain's threshold. If a channel is linked to sidechains A
and B the lower value of the two controls is used. The threshold
controls have a range of -20dBu to +16dBu, adjustable in 2dB
steps. Each channel's threshold may be modified by up to
±15dB irrespective of its linking by using the SC Trim controls.
-
A red LED indicator is provided in each sidechain link
button. This indicates that a channel is above threshold,
and either is the dominant signal or within 2dB of the
dominant signal on that sidechain.
Gain Makeup
Gain Makeup is used to restore the average level or loudness of
a compressed signal. Linking control voltage to a channel (with
the CV Link buttons) assigns either the A or B Gain Makeup
control to that channel. If control voltage from both sidechains is
linked the larger of the two values is used; this is because the
sidechain with the greater gain reduction will be controlling the
channel. The gain applied is adjustable from -10 to +20dB in
2dB steps.
Ratio
Ratio controls the amount of gain reduction applied as the input
level increases.
At 2:1 for example, a change of 10dB at the input produces a
change of 5dB at the output. Values available are 1.5:1, 2:1,
3:1, 4:1, 6:1, and 'max' (approximately 8:1).
The 8051 has a soft-knee characteristic, and its ratio gradually
increases as the compression becomes heavier at all settings.
The numbers given should therefore be considered average
values.
8051 5.1 Compressor User Guide
Issue 2 Page 10
8
dB
4
0
12
16
20
8
dB
4
0
12
16
20
8
dB
4
0
12
16
20
8
dB
4
0
12
16
20
A
B
-10
-10
+20
+20
2ms
2ms
4ms
4ms
6ms
6ms
8ms
8ms
16ms
16ms
-20
-20
+16
+16
1.5:1
1.5:1
2:1
2:1
8
8
8
8
8
8
8
8
12
12
12
12
12
12
16
16
16
16
4
4
4
4
4
4
4
4
0
0
0
0
3:1
3:1
4:1
4:1
6:1
6:1
max
max
.1s
.1s
..2s
.2s
.4s
.4s
.8s
.8s
1.5s
1.5s
3s
3s
8
dB
4
0
12
16
20
8
dB
4
0
12
16
20
A
B
-10
-10
+20
+20
2ms
2ms
4ms
4ms
6ms
6ms
8ms
8ms
16ms
16ms
-20
-20
+16
+16
1.5:1
1.5:1
2:1
2:1
8
8
8
8
8
8
8
8
12
12
12
12
12
12
16
16
16
16
4
4
4
4
4
4
4
4
0
0
0
0
3:1
3:1
4:1
4:1
6:1
6:1
max
max
.1s
.1s
.2s
..2s
.4s
.4s
.8s
.8s
1.5s
1.5s
3s
3s
8
dB
4
0
12
16
20
8
dB
4
0
12
16
20
A
B
-10
-10
+20
+20
2ms
2ms
4ms
4ms
6ms
6ms
8ms
8ms
16ms
16ms
-20
-20
+16
+16
1.5:1
1.5:1
2:1
2:1
8
8
8
8
8
8
8
8
12
12
12
12
12
12
16
16
16
16
4
4
4
4
4
4
4
4
0
0
0
0
3:1
3:1
4:1
4:1
6:1
6:1
max
max
.1s
.1s
.2s
.2s
.4s
.4s
.8s
.8s
1..5s
1.5s
3s
3s
8
dB
4
0
12
16
20
8
dB
4
0
12
16
20
A
B
-10
-10
+20
+20
2ms
2ms
4ms
4ms
6ms
6ms
8ms
8ms
16ms
16ms
-20
-20
+16
+16
1.5:1
1.5:1
2:1
2:1
8
8
8
8
8
8
8
8
12
12
12
12
12
12
16
16
16
16
4
4
4
4
4
4
4
4
0
0
0
0
3:1
3:1
4:1
4:1
6:1
6:1
max
max
.1s
.1s
.2s
.2s
.4s
.4s
.8s
.8s
1.5s
1..5s
3s
3s
8
dB
4
0
12
16
20
8
dB
4
0
12
16
20
A
B
-10
-10
+20
+20
2ms
2ms
4ms
4ms
6ms
6ms
8ms
8ms
16ms
16ms
-20
-20
+16
+16
1.5:1
1.5:1
2:1
2:1
8
8
8
8
8
8
8
8
12
12
12
12
12
12
16
16
16
16
4
4
4
4
4
4
4
4
0
0
0
0
3:1
3:1
4:1
4:1
6::1
6:1
max
max
.1s
.1s
.2s
.2s
.4s
.4s
.8s
.8s
1.5s
1.5s
3s
3s
8
dB
4
0
12
16
20
8
dB
4
0
12
16
20
A
B
-10
-10
+20
+20
2ms
2ms
4ms
4ms
6ms
6ms
8ms
8ms
16ms
16ms
-20
-20
+16
+16
1.5:1
1.5:1
2:1
2:1
8
8
8
8
8
8
8
8
12
12
12
12
12
12
16
16
16
16
4
4
4
4
4
4
4
4
0
0
0
0
3:1
3:1
4:1
4:1
6:1
6::1
max
max
.1s
.1s
.2s
.2s
.4s
.4s
.8s
.8s
1.5s
1.5s
3s
3s
8
dB
4
0
12
16
20
8
dB
4
0
12
16
20
A
B
-10
-10
+20
+20
2ms
2ms
4ms
4ms
6ms
6ms
8ms
8ms
16ms
16ms
-20
-20
+16
+16
1.5:1
1.5:1
2:1
2:1
8
8
8
8
8
8
8
8
112
12
12
12
12
12
16
16
16
16
4
4
4
4
4
4
4
4
0
0
0
0
3:1
3:1
4:1
4:1
6:1
6:1
max
max
.1s
.1s
.2s
.2s
.4s
.4s
.8s
.8s
1.5s
1.5s
3s
3s
8
dB
4
0
12
16
20
8
dB
4
0
12
16
20
A
B
-10
-10
+20
+20
2ms
2ms
4ms
4ms
6ms
6ms
8ms
8ms
16ms
16ms
-20
-20
+16
+16
1.5:1
1.5:1
2:1
2:1
8
8
8
8
8
8
8
8
12
112
12
12
12
12
16
16
16
16
4
4
4
4
4
4
4
4
0
0
0
0
3:1
3:1
4:1
4:1
6:1
6:1
max
max
.1s
.1s
.2s
.2s
.4s
.4s
.8s
.8s
1.5s
1.5s
3s
3s
THRESHOLDdBu
THRESHOLDdBu
MAKE-UP
GAINdB
MAKE-UP
GAINdB
RATIO
RATIO
ATTACK
ATTACK
RECOVERY
RECOVERY
GAINREDUCTION
GAINREDUCTION
A
B
-10
-10
+20
+20
2ms
2ms
4ms
4ms
6ms
6ms
8ms
8ms
16ms
16ms
8
dB
4
0
12
16
20
8
dB
4
0
12
16
20
A
B
-10
-10
+20
+20
2ms
2ms
4ms
4ms
6ms
6ms
8ms
8ms
16ms
16ms
-20
-20
+116
+16
1.5:1
1.5:1
2:1
2:1
8
8
8
8
8
8
8
8
12
12
12
12
12
12
16
16
16
16
4
4
4
4
4
4
4
4
0
0
0
0
3:1
3:1
4:1
4:1
6:1
6:1
max
max
.1s
.1s
.2s
.2s
.4s
.4s
.8s
.8s
1.5s
1.5s
3s
3s
8
dB
4
0
12
16
20
8
dB
4
0
12
16
20
A
B
-10
-10
+20
+20
2ms
2ms
4ms
4ms
6ms
6ms
8ms
8ms
16ms
16ms
-20
-20
+16
+116
1.5:1
1.5:1
2:1
2:1
8
8
8
8
8
8
8
8
12
12
12
12
12
12
16
16
16
16
4
4
4
4
4
4
4
4
0
0
0
0
3:1
3:1
4:1
4:1
6:1
6:1
max
max
.1s
.1s
.2s
.2s
.4s
.4s
.8s
.8s
1.5s
1.5s
3s
3s
-20
-20
+16
+16
1.5:1
1.5:1
2:1
2:1
8
8
8
8
8
8
8
8
12
12
12
12
12
12
16
16
16
16
4
4
4
4
4
4
4
4
0
0
0
0
3:1
3:1
4:1
4:1
6:1
6:1
max
max
.1s
.1s
.2s
.2s
.4s
.4s
.8s
.8s
1.5s
1.5s
3s
3s
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