mixed
with
other
program material; it performs this task significantly more
smoothly than the Orban
dedicated de-essers because its threshold does not follow
the
average
input level.
It
is important to
critically audition any program material processed in this way
to be
sure
that the
control action does
not produce unnatural pumping or
modulation effects,
since the perceived reduction of high frequencies is essentially
a
psychoacoustical illusion.
(Strictly speaking, the frequency
response is always "flat";
only
the
overall gain changes.)
Since the
DE-ESSER
OPerate/DEFEAT
switch does not introduce clicks
or
discontinuities, it is
quite practical
to
key the de-esser
in
and
out as
necessary to
deal with certain
"difficult" sections in the program.
Adjusting
the OUTPUT
ATTEN Control (rear pmel)
In many cases
the 424A is used to provide peak overload protection
for a
recording or
transmission
device.
Particularly
when the OUTPUT
TRIM
control
is
used
in conjunction with
the VCA
LEVEL meter to produce
readings around OdB
(as described above), the
peak
output
level of the 424A
will be relatively constant. Therefore,
best match between the
424A
and
such
a
protected
device occurs
at a gain
which
drives the device up
to,
but no
further
than,
its
optimum
operating level. This gain need be
adjusted only
once for
a
given device.
Adjustment
may be effected either with
the
device's own
input attenuator, or
with the
424A's
OUTPUT ATTENuator (located
on
the rear
panel).
18
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