4. Front Panel Overview
DUAL STEREO
STEREO
LINK
DUAL MONO
IN
GAIN (dB)
+10
+20 BYPASS
0
BYPASS
+12.5 +5 +15
+5 2
RATIO (X:1)
10
-10 1
SLOW
-2.5
1.3 2.5
THRESHOLD (dBu)
-10
THRESHOLD (dBu)
BYPASS
FAST
SLOW
-40
+10 -25
-20
THRESHOLD (dBu)
BYPASS
+5
-5 -30
RELEASE
FAST
RELEASE
OUT
0VU CLIP-20 -3
LIMIT
-10 -6 -9 -12 -2
COMPRESSOR
-8 -6 -10 -12 -25 -15 -2 -6 -12 -18
EXPANDER
-4
The 425 has the following controls, switches, and indicators on its front panel:
Expander
T
HRESHOLD
Sets the signal level below which the expander begins to
operate. When the input signal falls below the level indicated
on the knob, the expander begins reducing the gain. The LED
display above the knob indicates how much the expander has
reduced the gain.
RELEASE
Determines the speed at which the expander reduces the gain
for an instantaneous change in the input signal (below
threshold). Use the
RELEASE control to prevent the expander
from punching holes in the input signal.
LED Display The expander display indicates how much the expander has
reduced the level of the input signal.
Compressor
T
HRESHOLD
Sets the level above which the compressor begins reducing the
output level.
RELEASE
Determines the speed at which the compressor restores the
gain for an instantaneous change in the input signal. Use the
RELEASE control to smooth the action of the compressor on
staccato material.
RATIO
Determines the amount of change in the output for a given
change in the input. If the ratio control is set to 10:1, this
means that the output will change 1 dB (not much) for a 10 dB
(3.16 times) change in the input. Use higher ratios to control
peaks and lower ratios to smooth out average levels.
LED Display Indicates how much the output level has been reduced by the
compressor.
Limiter
T
HRESHOLD
Sets the level above which the limiter begins reducing the
output level.
LED Display Indicates how much the output level has been reduced by the
limiter. -3 to -6 dB indications are a good place to start.
4-1
Rev 2.0, 10/29/93
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