3-26
OPERATION
ORBAN MODEL 8382
The multiband silence gate causes the gain reduction in bands 2 and 3 of the multi-
band compressor to move quickly to the average gain reduction occurring in those
bands when the gate first turns on. This prevents obvious midrange coloration un-
der gated conditions, because bands 2 and 3 have the same gain.
The multiband gate also independently freezes the gain of the two highest fre-
quency bands (forcing the gain of the highest frequency band to be identical to its
lower neighbor), and independently sets the gain of the lowest frequency band ac-
cording to the setting of the
DJ
B
ASS
boost control (in the Equalization screen).
Thus, without introducing obvious coloration, the gating smoothly preserves the av-
erage overall frequency response “tilt” of the multiband compressor, broadly main-
taining the “automatic equalization” curve it generates for a given piece of pro-
gram material.
If the
MB
G
ATE
T
HR
(Gate Threshold) control is turned
O
FF
, the
DJ
B
ASS
control is disabled.
AGC B CPL
(“AGC Bass Coupling”) control sets the balance provided in the AGC be-
tween bass and the rest of the frequency spectrum.
The AGC processes audio in a master band for all audio above approximately 200Hz,
and a bass band for audio below approximately 200Hz. The
AGC
B
C
PL
control de-
termines how closely the on-air balance of material below 200Hz matches that of
the program material above 200Hz.
Settings toward 100% (wideband) make the output sound most like the input. Be-
cause setting the
AGC
B
C
PL
control at 100% will sometimes cause bass loss, the
most accurate frequency balance will often be obtained with this control between
70% and 90%. The optimal setting depends on the amount of gain reduction ap-
plied and on the AGC release time. Usually, you will adjust the
AGC
B
C
PL
control
until the Master AGC and Bass AGC Gain Reduction meters track as closely as possi-
ble unless you want the AGC to provide some gentle automatic re-equalization of
the input material.
With the
AGC
M
ASTER
R
ELEASE
control set to 2 dB/second, setting the
AGC
B
C
PL
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, but may pump up
rumble and other noise.
AGC METR (“AGC Meter Display”)
determines what the AGC meter shows the
gain reduction of the slow two-band AGC processing that precedes the multi-band
compressor. Full-scale is 25 dB gain reduction.
M
ASTER
displays the gain reduction of
the Master (above-200 Hz) band.
B
ASS
displays the gain reduction of the Bass (be-
low-200 Hz) band.
D
ELTA
displays the difference between the gain reduction in the
Master and Bass bands.
Although it is located in the Full Modify screen (to make it easy for a preset devel-
oper to switch meter modes), this control is
not
part of the active preset and its set-
ting is not saved in User Presets, unlike the other controls in the Full Modify screens.
The meter mode always reverts to
M
ASTER
when the user leaves Full Modify.
Summary of Contents for Optimod-TV 8382
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