565E
8
Expander Section
THRESHOLD control - The THRESHOLD control varies the
downward expander threshold from +10dBu to BYPASS.
The downward expander will engage when the audio
signal present at the input of the expander drops below
this threshold, or when there is no signal present at the
expander’s input. The downward expander gently lowers
below-threshold signals at a ratio of 1:1.5 (a 1dB below-
threshold drop in signal at the expander’s input results
in a 1.5dB drop in signal at the expander’s output).
RELEASE control - The RELEASE control allows the user to
vary the downward expander release time from 250
milliseconds to 5 seconds. The release time is the
amount of time that it takes for the downward expander to push the output signal down to the
level determined by the 1:1.5 ratio, in response to an instantaneous below-threshold drop in
the input signal level. Shorter release time settings cause the expander to act more quickly,
and longer release time settings cause the expander to act more slowly and smoothly.
LED display - The LED display indicates the amount by which the expander has reduced the
level of the input signal.
The Compressor Controls
THRESHOLD control - The THRESHOLD
control varies the compressor threshold
from -40 dBu to +20 dBu. The compres-
sor threshold is the level that the input
signal must reach before the compressor
becomes active. When the input signal
exceeds this threshold, the compressor
will reduce the output gain by the
amount determined by the compressor
RATIO control setting.
RELEASE control - The RELEASE control
allows tailoring of the compressor’s
recovery time to the program material.
Generally, peak limiting is associated with short release times and compression, or leveling, is
associated with longer release times.
The 565E’s release circuitry has a unique dual-release time feature designed to make life easier.
The dual-release feature makes the release time partially program-dependent, giving you the
best of both worlds: fast release for short-duration peaks and a longer release time for longer-
duration peaks. The RELEASE control adjusts the speed of the longer of the two. The
compressor release time can be varied from 180 milliseconds to 2.5 seconds.
RATIO control - The RATIO control determines the amount of compression that occurs for a
given above-threshold change in the input level. The ratio that is being controlled is the ratio
between an above-threshold change in the input level and the resulting change in the output
level. If the RATIO control is set to 10:1, then a 10 dB above-threshold change in the input
level would result in only a 1 dB change in the output level. Higher ratios are used where
tighter control is desired, such as when you want to control peaks in the audio signal, and
lower ratios are used for gentle smoothing of levels.
LED display - The LED display indicates the amount by which the output level has been
reduced by the compressor.
Front Panel Overview Chapter 5
CH1 EXPANDER
-2 -6 -18 -12
-12
-25 0
SLOW
BYPASS
FAST
RELEASE
+10
THRESHOLD (dBu)
-4 -6 -2 -15 -10 -12 -8 -25
CH1 COMPRESSOR
4-10
62.5+5
10
1
RATIO (X:1)
FAST-40
+20 SLOW
RELEASETHRESHOLD (dBu)
-25
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