3-56
OPERATION
2B Gate Thresh (Threshold)
control determines the lowest input level that
OPTIMOD-FM recognizes as program; lower levels are considered to be noise or
background sounds and will cause the AGC or two-band compressor to gate, effec-
tively freezing gain to prevent noise breathing.
There are two independent gating circuits in the 8600. The first affects the AGC and
the second affects the two-band compressor. Each has its own threshold control.
The two-band gain reduction will eventually recover to 0 dB and the AGC gain re-
duction will eventually recover to –10 dB even when their compressor gates are gat-
ed. However, recovery is slow enough to be imperceptible. This avoids OPTIMOD-
FM’s getting stuck with a large amount of gain reduction on a long, low-level musi-
cal passage immediately following a loud passage.
It is common to set the
2B
G
ATE
T
HRESH
control to –40. Higher settings are primarily
useful for radio drama, outside sports broadcasts, and other non-musical program-
ming that contain ambiance, low-level crowd noise, and the like. Slightly higher set-
tings may increase the musicality of the compression by slowing down recovery on
moderate-level to low-level musical passages. When such passages cause the gate to
cycle on and off, recovery time will be slowed down by the ratio of the “on-time” to
the “off time.” This effectively slows down the release time as the input gets pro-
gressively quieter, thus preserving musical values in material with wide dynamic
range (classical music for example).
2B Bass Coupling
control is used to set the balance between bass and the rest of
the frequency spectrum.
The two-band compressor processes audio in a master band for all audio above ap-
proximately 200 Hz and a bass band for audio below approximately 200 Hz. The
2B
B
ASS
C
OUPLING
control determines how closely the on-air balance of material below
200 Hz matches that of the program material above 200 Hz.
Settings toward 100% (wideband) make the output sound most like the input. Be-
cause setting the
2B
B
ASS
C
OUPLING
control at 100% will sometimes cause bass loss,
the most accurate frequency balance will often be obtained with this control set be-
tween 70% and 90%. The optimum setting depends on the amount of gain reduc-
tion applied. Adjust the
2B
B
ASS
C
OUPLING
control until the band 1 and band 2 Gain
Reduction meters track as closely as possible.
With the
2B
R
ELEASE
(Two-Band Release) control set to 2 dB / second, setting the
2B
B
ASS
C
OUPLING
control toward 0% (independent) will produce a sound that is very
open, natural, and non-fatiguing, even with large amounts of gain reduction. Such
settings will provide a bass boost on some program material that lacks bass.
With fast release times, settings of the
2B
B
ASS
C
OUPLING
toward 100% (wideband)
do not sound good. Instead, set the
2B
B
ASS
C
OUPLING
control toward 0% (inde-
pendent). This combination of fast release and independent operation of the bands
provides the maximum loudness and density on small radios achievable by the Two-
Band structure. But such processing may fatigue listeners with high-quality receivers
and also requires you to activate the AGC to control the average drive level into the
two-band compressor, preventing uncontrolled build-up of program density. Instead
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