API 527 - Compressor Controls

API 527 Compressor
Compressor Controls
The 527 Compressor provides a comprehensive suite of
controls:
· OUT: Output level adjust
· THRESHOLD: The level at which compression begins
· ATTACK: The time it takes for the compressor to respond
· RELEASE: The time it takes the compressor to return to
unity gain
· RATIO: The amount of compression applied above the
threshold
· TYPE: NEW or OLD detection path topology
· KNEE: The characteristic of the response curve at the
onset of compression.
· THRUST®: Patented circuit that inserts a high-pass filter
before the RMS detector
· GR Meter (GAIN REDUCTION): 10 LED gain reduction
meter
· LINK: Activates the DC LINK for stereo/multichannel
processing with other 527 units
· IN: Inserts or completely removes the 527 Compressor
from the audio path (when not pressed)
527
TYPE
LINK
KNEE
THRUST
R
METER
.3
.5
1
2
2.5
3
1.5
RELEASE
S
VU
GR
-3
-5
-7
OV
0
-10
-1
-20
1
2
3
VU
GR
IN
NEW
OLD
HARD
SOFT
IN
0
10
dB
T
U
O
0
T
H
R
E
S
H
10 -20
7
4
0
-3
dBu
1
5
15
20
ATTACK
mS
25
IN
RATIO
1
1.5
3
2.5
6
10
0
4
0
0
-8
-6
-4
-1.5
-10
-12
-15
-17
-19
-23
-6
OUT - Continuously variable 31 position
detented output level pot
THRESHOLD - Continuously variable 31 position
detented control
METER - 10 segment LED meter shows gain reduction
or audio level
LINK - Selects linking of multiple units for stereo
TYPE - Selects Feed-Back (OLD) or Feed-Forward (NEW)
Compression
KNEE - Selects Hard or Soft knee
THRUST - Inserts the Thrust Filter in the RMS detector
IN - Inserts the 527 into the audio path
RATIO - Continuously variable 31 position control
ATTACK/RELEASE - Continuously variable 31 position
detented controls
Page 3
METER SWITCH - Selects gain reduction or audio level