Orban Optimod-FM 8300 Operating Manual page 170

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OPERATION
ral upper midrange boost in light pop and instrumental formats. The gain of band 5
is further affected by the B4>B5 CPL control.
B4>B5 CPL ("Band 4>5 Coupling") controls the extent to which the gain of band 5
(6.2 kHz and above) is determined by and follows the gain of band 4.
The sum of the high frequency limiter control signal and the output of the B4>B5
CPL determines the gain reduction in band 5. The B4>B5 CPL control re-
CONTROL
ceives the independent left and right band 4 gain control signals; this feed is unaf-
fected by the band 4
M
B3>B2 CPL and B2>B3 CPL controls determine the extent to which the gains of
bands 2 and 3 track each other.
When combined with the other coupling controls, these controls can adjust the mul-
tiband processing to be anything from fully independent operation to quasi-
wideband processing.
B2>B1 CPL control determines the extent to which the gain of band 1 (below 100Hz
or 200Hz, depending on crossover setting) is determined by and follows the gain of
band 2 (centered at 400Hz). Set towards 100% (fully coupled) it reduces the amount
of dynamic bass boost, preventing unnatural bass boost in light pop and talk for-
mats. Set towards 0% (independent), it permits frequencies below 100Hz (the
"slam" region) to have maximum impact in modern rock, urban, dance, rap, and
other music where bass punch is crucial. The default setting is 30%.
Bx Out ("Band x Output Mix") controls determine the relative balance of the bands
in the multiband compressor. Because these controls mix after the band compres-
sors, they do not affect the compressors' gain reductions and can be used as a
graphic equalizer to fine-tune the spectral balance of the program material over a
3 dB range.
Their range has been purposely limited because the only gain control element after
these controls is the back-end clipping system (including the multiband clipper / dis-
tortion controller), which can produce considerable audible distortion if overdriven.
The thresholds of the individual compressors have been carefully tuned to prevent
audible distortion with almost any program material. Large changes in the fre-
quency balance of the compressor outputs will change this tuning, leaving the 8300
more vulnerable to unexpected audible distortion with certain program material.
Therefore, you should make large changes in EQ with the bass and parametric
equalizers and the HF enhancer, because these are located before the compressors.
The compressors will therefore protect the system from unusual overloads caused
the chosen equalization. Use the multiband mix controls only for fine-tuning.
You can also get a similar effect by adjusting the compression threshold of the indi-
vidual bands. This is comparably risky with reference to clipper overload, but unlike
the controls, does not affect the frequency response when a given band
MB B M
AND IX
is below threshold and is thus producing no gain reduction.
HF CLIP ("High Frequency Clipper Threshold") sets the threshold of the multiband
clipper in band 5 with reference to the final clipper threshold, in dB. This clipper
control. Range is 0 to 100% coupling.
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ORBAN MODEL 8300