Orban OPTIMOD-FM 8500S, Operating Manual

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3-50
OPERATION ORBAN MODEL 8500S
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 com-
pressor (above 200 Hz).
2B Bass Attack sets the attack time of the Two-Band Compressor bass compressor
(below 200 Hz).
Lookahead determines the lookahead 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
OOKAHEAD
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 lookahead 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 3-37 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:
2B Clipping is a compression threshold control that affects the bass and master
bands equally. It sets the drive level to the high frequency limiting and multiband
distortion-controlling processing that precedes the final clipping section. The distor-
tion-controlling section uses a combination of distortion-cancelled clipping and
look-ahead processing to anticipate and prevent excessive clipping distortion in the
final clipper.
This control does not affect the HD processing chain.
MB Limit Threshold determines the threshold of the lookahead clipping distortion
controller (measured in dB) with reference to the final clipper. In general, it should
be set at “0” so that it matches the threshold of the final clipper. Setting it higher
than “0” allows more punch (due to clipping) at the expense of higher clipping dis-
tortion, which may be particularly annoying on voice.
This control does not affect the HD processing chain.
2B HF Limiting sets the threshold of the high frequency limiter in the Two-Band
structure. When this control is set lower, gain reduction does more high frequency
limiting. When this control is set higher, distortion-cancelled clipping does more
high frequency limiting. It controls the tradeoff between loss of high frequencies
(due to high frequency limiting) and excessive distortion (due to clipping).
This control only affects the analog processing chain.