PERFORMANCE
HIGHLIGHTS
Part A:
Introduction
The Orban Model
422A/424A Compressor/Limiter/De-Esser
is an integrated AGC
device of
highest professional quality. It can
perform
compression,
peak
limiting,
and vocal de-essing
functions simultaneously with
unusual freedom from side-effects.
It can thus serve
either as a general-purpose no-compromise compressor/limiter, or
as a complete dynamic processor for conditioning vocals. However, it is not
optimized for over modulation
protection of broadcast transmitters,
and the Orban
OPTIMOD-AM, -FM,
or
-TV
should be used in such applications.
The flexibility and
natural sound
of
the 422A/424A make it
applicable
in other
areas of
professional
audio
as
well: recording
studios, sound reinforcement, public
address, motion
picture sound, etc.
The product is available
in
both single-
(422A)
and dual- (424A) channel versions.
(For clarity, only
the 424A will be
referenced
in this manual.) The dual-channel
version
is equipped with
a
coupling switch which forces the gain
of
both channels
to
be
equal,
tracking the channel demanding the greatest amount
of
gain reduction.
This preserves correct
imaging in stereo
applications.
However,
the stereo
coupling
switch
does not
couple
the operating
controls,
and these are ordinarily
set
identically in stereo
operation.
Attack
and release times are
both program-controlled,
but can be scaled faster or
slower by means of
front-panel controls. This results in
maximum flexibility, plus
extremely natural sound over
a
wide
range of control settings.
The 424A Compressor is equipped with electronically-balanced inputs and
outputs
and
is compatible
with
the levels and impedances found in both
professional and
semi-professional applications.
RF
suppression applied
to
the input, output, and
power leads enables
use in
relatively high
RFI
fields such as those
common in
broadcasting.
The
controls and features of the 424A Compressor are fully
described in this
manual.
It
will
familiarize you
with
the unit's potential and enable you
to
imaginatively
use
the
424A for your specific installation and
application.
Because
the front-panel controls are marked in
a
familiar way, you
may
be
tempted to
jump right
in
without
reading
the manual. However, if you take the
time to review the
Description And
Function
Of Front-Panel Controls
and
Operating Instructions in Part
C, you
will find
that there is
"more than meets the
eye" inside the 424A, and
that the time
you
take reading
the manual will be well-
rewarded
by a
greater understanding
of the unit's potential.
Production AGC function using
circuitry adapted from industry-standard
OPTIMOD-FM Model
8I00A broadcast signal
processor
De-esser
characteristics similar to
highly-accepted Orban dedicated de-essers
Independent
compressor/limiter
and de-esser control
loops with optimized,
program-controlled
parameters for each
Unbeatable ability
to increase average
loudness of program material or
individual tracks without
introducing
unnatural sound quality or artifacts
Defeatable gain-freezing
gate
with
user-adjustable
threshold
to prevent
pumping
and breathing during
pauses
5
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