dbx 566 Manuel du propriétaire - Page 8

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dbx 566 Manuel du propriétaire
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+5
0
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-15 -10
Figure 3: Hard Knee and OverEasy ® Compression Curves
RATIO control:
This control selects the ratio between input and the output levels for signals above the level set by the
Threshold control. It is adjustable between 1:1 (no compression) and infinity:1 (full compression).
Note that when OverEasy
compressed region. As the signal exceeds the threshold, the ratio approaches the ratio set by the Ratio
control.
ATTACK control:
This control sets the amount of time it takes the 566 to begin compressing a signal once the detector
has sensed a signal above the threshold. The attack range is from 3 dB/msec for a tighter and more
noticeable compression effect with very little overshoot to .04 dB/msec for a more gradual compres-
sion that preserves attack transients. A very fast attack setting will cause the 566 to act like a peak
Limiter even though RMS (average level) detection circuitry is used. Slower attack settings cause the
566 to act like an RMS or averaging detecting Compressor/Limiter.
AUTO switch:
This switch overrides both the Attack and Release controls and enables preset program-dependent
attack and release times. These times are derived from the characteristics of the input signal and con-
tinuously change to match its dynamics. The switch lights indicating the attack and release times are
being automatically adjusted in a program-dependent fashion. Enabling the Auto function duplicates
the Òclassic dbx soundÓ of the 566Õs forerunners which have become standards in the industry.
RELEASE control:
The Release control sets how fast the compression circuit returns the input to its original level. The
release rate is from 250 dB/sec where compression follows the envelope of the program material very
tightly to 5 dB/sec for very smooth compression.
6
1:1 Unity
RED
Above Threshold
2:1
4:1
20:1
Rotation Point Threshold
GREEN
Below Threshold
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0
+5
+10
+15 +20
INPUT LEVEL (dB)
¨
processing is selected, the ratio slopes gradually from the linear to the
+20
+15
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0
:1
5
10
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15
1:1
2:1
4:1
:1
RED
Above Threshold
OverEasy Range
Below Threshold
10
5
0
+5
+10
+15 +20
INPUT LEVEL (dB)