page A – 5
HD P3 / Aug 2006
A P P E N D I C E S
AGC
A common set of parameters control the behaviour of the three
independent band-split AGC systems.
Attack:
50mS – 500mS (200mS)
Release:
100mS – 3Sec. (1.5Sec.)
Defaults:
Off
Compressor - “Production”
A three band frequency split compressor/limiter, each band having
individual parameters:
Threshold:
-30 to -70dBfs (-40dBfs)
Attack:
0.1mS – 300mS (1mS)
Release:
33mS – 1Sec. (150mS)
Ratio (soft-knee):
1:1 – 20:1
LF Crossover Frequency:
20Hz – 1kHz (250Hz)
HF Crossover Frequency:
1kHz – 20kHz (4kHz)
Drive (Overall “Threshold”):
0 – 100% (50%)
Trim (HF, MF, LF):
+/- 18dB (0dB)
Makeup Gain:
-20 to +48dB (0dB)
Multiband Limiter - “Airchain”
An alternative to the above three-band compressor, this is a three-
band peak limiter, each band having individually set parameters:
Drive
0 to 100% (50%)
Attack
0.2mS – 1S (0.5mS)
Release
33mS – 1S (50mS)
Backoff
0dB to -10dB (0dB)
Clip
Hard / Soft (Soft)
Trim
+/-18dB (0dB)
Freeze
0dB to -60dB (-40dB)
LF crossover frequency:
20Hz – 1kHz (250Hz)
HF crossover frequency:
1kHz – 20kHz (4kHz)
