Orban OPTIMOD-FM 8700, Operating Manual

Page: 230 / 390

3-60
OPERATION ORBAN MODEL 8700i
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
of operating the Two-Band structure like this, you should usually choose a Five-Band
preset instead.
Advanced Two-Band Controls
The following Two-Band controls are found only in the Advanced Modify screen.
2B Master Comp Threshold sets the level where gain reduction starts to occur in the
Master (above 200 Hz) band of the Two-Band Compressor.
2B Bass Comp Threshold determines the compression threshold of the bass band in
the Two-Band Compressor. It can be used to set the target spectral balance of the
Two-Band Compressor.
As the Two-Band Compressor B
ASS
C
OUPLING
control is moved towards
“100%,” the Two-Band Compressor
B
ASS
T
HRESH
control affects the
sound less and less.
2B Master Attack sets the attack time of the Two-Band Compressor master compres-
sor (above 200 Hz).
2B Bass Attack sets the attack time of the Two-Band Compressor bass compressor
(below 200 Hz).
Look-ahead determines the look-ahead time (in milliseconds) in the two-band com-
pressor. 3.6 milliseconds give minimum overshoot for the factory preset attack time
of 11.0. If you adjust
L
OOK
-
AHEAD
for less delay, you will get progressively more over-
shoot. This will cause more voice distortion but will create more transient impact on
percussion because transients will hit the clippers harder instead of being controlled
inaudibly by the look-ahead compressor.
This control does not affect the HD processing chain.
2B Crossover sets the structure of the 2-Band crossover to Linear or Linear with No
Delay. See page 3-44 for more detail about these modes.
The relationship and interaction of the next four controls is complicated and is best
appreciated by listening and experimenting: