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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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