18
2254 Compressor
The two on-board 2254 mono compressors are based
on the classic 2254 series originally released in 1969.
This particular model was re-released in 2009. A powerful
compressor/limiter, all buttons can be stored and are
recallable using the Series 75 Scenes.
Both 2254's are available externally on the rear panel of
the Master Section, or can be linked and applied to the
Main Mix.
2254 Compressor
Meters
MIX - Will apply the 2254 Compressors to the Main Mix
Outputs, pre-fader and before the insert points. The 2254
Compressors are also available on the rear panel of
the Master Section. When the Mix button is
inactive, the 2254 will process the external
inputs.
IN - Lights yellow when selected. Sends the
signal through the units circuitry, even if the
unit does not have the Limit or Compress
functions selected. If unlit, the unit is hard
bypassed, i.e., the input is connected directly
to the output.
MeTer - Cycles through the Meter display
options. Meters can be set to display either
the Input signal (In LED will be active),
Output signal (OuT LED will be active), or
the amount of Gain Reduction applied to the
signal by the Compressor and Limiter in total
(GR LED will be active).
sT lInK - Lights yellow when selected. Press
this button when you wish to link both 2254
units together. This will process the left and
right side of the Main Mix, or an external
signal which has been patched into the rear
panel of the Master Section.
2254 Controls
COMP In - Switches the Compressor in (up)
and out (down) of the circuit.
COMP THresHOlD - Can be varied in 2dB
steps from -20dBu to +10dBu, thus a wide
variety of effects can be achieved. Low Ratios
operated with a low Threshold will preserve
the dynamic range and also achieve a high
signal to noise ratio. A high Ratio with a high
Threshold will behave as a partial limiter.
GaIn MaKeuP - Provides up to 20dB of
additional gain in 2dB steps.
COMP reCOVerY - Sets the response time the
compressor takes to return to 0dB gain reduction.
Three presets are provided: 100 ms, 200 ms, 800 ms,
plus an auTO setting.
In the AUTO position, both the Attack and Recovery times
are composite and self-adjusting. Speeds are rapid for
isolated peaks, while remaining slow for persistently high
levels, so the impression of a normal dynamic range is
preserved as the program rides on a slowly moving 'gain
platform'.
COMP raTIO - Controls the ratio of gain reduction to
input signal level.
MAIN
MIX
IN
METER
IN
GR
OUT
IN
GR
OUT
LINK
IN
METER
N2069
COMP THRESHOLD
GAIN MAKE UP
COMP RECOVERY
0
-10
-20
+10
COMP IN
0
20
AUTO
10
400mS
800mS
1.5S
LIMIT LEVEL
LIMIT ON
FAST ATTACK
+4
+8
+20
+16
+12
LIMIT RECOVERY
100mS
AUTO
200mS
800mS
4:1
2:1
1.5:1
6:1
3:1
COMP THRESHOLD
GAIN MAKE UP
COMP RECOVERY
0
-10
-20
+10
COMP IN
0
20
AUTO
10
400mS
800mS
1.5S
LIMIT LEVEL
LIMIT ON
FAST ATTACK
+4
+8
+20
+16
+12
LIMIT RECOVERY
100mS
AUTO
200mS
800mS
4:1
2:1
1.5:1
6:1
3:1
COMP RATIO
RIGHT
2254
COMP RATIO
LEFT
2254
