Part
C: Operating
Instructions
FRONT
PANEL
While the
following control descriptions might seem unnecessarily
complex on first
DESCRIPTION
reading,
they have
been crafted to answer any
reasonable question either
the
AND
FUNCTION
beginner or
the experienced user
might
ask. The effects of, and
interactions
between,
the
controls have
been designed
to promote ease of
use,
facilitafing
good
results
with minimum
effort.
Some
of these
interactions and
effects are subtle,
and
are
much more
easily appreciated
by actual
practice
than by reading.
Refer to
the
Front-Panel Photograph at the beginning of this Manual.
The GAIN
REDUCTION
meter
is
electronically conditioned
to show
the true
peak
gain reduction of fhe compressor/limiter
section,
in
dB. It does
not
indicate
the amount
of de-essing
gain
reduction, which
is
indicated by
illumination of the NORMal and HEAVY de-essing indicators.
If
the meter enters the red part of the scale, it indicates that no further
gain reduction
is
available
in
the compressor/limiter section, and that audible
"gulping"
or
other
peculiarities caused by the control loop's saturating
are
imminent.
The
INPUT
ATTENuator
adjusts
the drive level to the compressor/limiter,
thus
determining
the amount of gain reduction.
(NOTE: There Is
no user-
adjustable THRESHOLD control. However,
adjusting either the ATTACK TIME
or
RATIO controls also adjusts the threshold to keep the peak output level
approximately constant.)
The COMPression RATIO control adjusts the compression ratio
(i.e.,
the dB
change in
input level divided by the resultant dB change in output level).
The
calibrations are
only valid at the threshold
of gain
reduction. As more gain
reduction is used, the compression ratio
increases,
yielding
a "soft
knee"
curve
when
the COMPression RATIO control is adjusted
for
lower ratios.
Fig.
C-l:
OUTPUT LEVEL AS A FUNCTION OF
INPUT LEVEL
FOR
VARIOUS SETTINGS OF THE RATIO
CONTROL
The ATTACK
I IME control scales
the
program-controlled attack characteristic
faster or slower,
and
simultaneously
adjusts the compression threshold.
(The
attack time
is
not
constant.)
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