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Co-Operator
INTRODUCTION
1-5
air,
this
becomes
critically
important.
The
Co-Operator guards
against
overheating
and subsequent thermal
failure.
In
an
attended
bi-amped
system, the
Co-Operator can
be
placed
after
an
electronic
crossover.
The two
channels of the
unit are arranged
to
separately feed the
power
amps
for
LF
and
HF
drivers.
In
this
application the leveler
is
defeated
(so
it
does
not
fight
with
the
mixing
engineer),
leaving the compressor, high-frequency
limiter,
and
peak
clipper
to
guard
the
system
from
overload. In
particularly
high-SPL
environ-
ments, the
compressor
may
be
uncoupled
so
that
each channel of
the
Co-Operator can
operate
independently
to deliver
the
maximum
level to
each
driver
without
distortion.
Similarly, the
Co-Operator's
controlled clipping avoids clipping
of
the
power
ampli-
fier,
which can
cause
"sticking",
instability,
and
other audible problems.
Broadcast
Studio/Transmitter Link Protection
The
STL
is
often the
weak
link in
the broadcast chain
due
to
barely adequate
signal-
to-noise
ratio.
Clean
protective limiting
ahead
of
the
pre-emphasized
STL
transmitter
helps
maximize
the signal-to-noise
ratio at
the receiver
and
prevents overload.
The
selectable
pre-emphasis ensures
matching of
the
high-frequency
limiting function to
the
STL's
overload
characteristic.
FM
Subcarriers
Voice or
music
SCA
channels
are typically
pre-emphasized
at
150ns. In addition
to
providing
transparent
gain
riding
and
level control for the subcarrier, the
Co-Operator
can
also
provide
the rarely
found 150ns
HF
limiting function,
which
permits
more
efficient
use
of
the
SCA
channel
by
eliminating
overmodulation
on
HF
peaks.
See
Section 3
for
specific
information
on
setting the
controls for
your
application.
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