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NOTE:
Care should be taken
in
adjusting the endcut filters
so
that the
program material
is
not adversely affected.
Use
your ears
to
evaluate
the adjustments.
If it
sounds good,
it is
good.
3.3
GAIN STRUCTURE AND SIGNAL-TO-NOISE
Only
the
correct gain structure throughout
the
entire audio
system will enable
the user to take
advantage
of the
optimum
signal-to-noise ratio built
into the individual components.
In
this discussion, the
matching between
the
equalizer
and
a
following
power amplifier
is
considered.
The Model 562 was designed for
a
maximum average
signal level
at its input of
approximately
0
dB
(Ref.
0.775 V rms).
This
guarantees
20
dB of headroom; that
is,
peaks may
be 20 dB above the
average level before any clipping could occur.
Residual output
noise from
the Model 562
is 90
dB below the
average signal level,
or greater than 110 dB below maximum output level, and therefore
inaudible
.
For signal levels from
equipment with less output capability,
the Input Level
control
of the
Feedback Suppressor provides
a
convenient preamplifier
for additional gain, up
to 20
dB above
unity, without reducing the
excellent signal-to-noise ratio.
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14
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