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PART
A;
Introduction
The
Orban Model 412A/414A Compressor/Limiter
is
a
general-purpose
AGC
device
of
highest
professional
quality.
It
can
perform
compression
and
peak
limiting
simultaneously with unusual
freedom from
side-effects.
The
flexibility
and
natural
sound
of
the
412A/414A make
it
applicable
in
virtually
all
areas
of professional audio:
recording
studios,
broadcasting,
sound reinforcement,
public
address,
motion
picture
sound,
etc.
However,
it
is
not
optimized
for
overmodulation
protection
of
broadcast
transmitters; the
Orban
OPTIMOD-AM,
-FM,
or
-TV
should be used
in
such
applications.
The
product
is
available
in
both
single-
(412A) and
dual-
(414A) channel
versions.
(For
clarity,
only
the
414A
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.
(If
they
are
set
non-identically
,
the
gain
of
both
channels
will
still
be
equal,
tracking
the
channel
demanding
the highest
amount
of
G/R. However,
the control circuitry
will
respond
differently to
material
in
the
two
channels even
if
a
mono
feed
is
used.
This
might
be
useful
for
special
effects.)
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 414A
Compressor/Limiter
is
equipped
with
electronically-balanced
input
and
output, 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.
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
414A, and
that
the
time
you take
reading
the
manual
will
be
well-rewarded
by
a
greater understanding
of
the unit's potential.
1
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