Optimod-AM 9400 V1.2 Operating Manual - Orban
Optimod-AM 9400 V1.2 Operating Manual - Orban
Optimod-AM 9400 V1.2 Operating Manual - Orban
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OPTIMOD-<strong>AM</strong> DIGITAL OPERATION 3-53<br />
duction in band 5. Higher settings produce more HF limiting. A setting of “–18” provides<br />
a good trade-off between brightness and distortion at high frequencies.<br />
Limiter Attack controls allow you to set the limiter attack anywhere from 0 to<br />
100% of normal in the Five-Band compressor / limiters. Because the limiter and compressor<br />
characteristics interact, you will usually get best audible results when you set<br />
these controls in the range of 70% to 100%. Below 70%, you will usually hear<br />
pumping because the compressor function is trying to generate some of the gain<br />
reduction that the faster limiting function would have otherwise produced. If you<br />
hear pumping in a band and you still wish to adjust the limiter attack to a low setting,<br />
you can sometimes ameliorate or eliminate the pumping by slowing down the<br />
compressor attack time in that band.<br />
Delta Release controls are differential controls. They allow you to vary the release<br />
time in any band of the Five-Band compressor/limiter by setting an offset between<br />
the MULTIBAND RELEASE setting and the actual release time you achieve in a given<br />
band. For example, if you set the MULTIBAND RELEASE control to medium-fast and the<br />
BAND 3 DELTA GR control to –2, then the band 3 release time will be the same as if<br />
you had set the MULTIBAND RELEASE control to medium and set the BAND 3 DELTA GR<br />
control to 0. Thus, your settings automatically track any changes you make in the<br />
MULTIBAND RELEASE control. In our example, the release time in band 3 will always be<br />
two “click stops” slower than the setting of the MULTIBAND RELEASE control.<br />
If your setting of a given DELTA RELEASE control would otherwise create a release<br />
slower than “slow” or faster than “fast” (the two end-stops of the MULTIBAND<br />
RELEASE control), the band in question will instead set its release time at the appropriate<br />
end-stop.<br />
This control is particularly useful in B5, allowing B5 to function as a fast de-esser<br />
while the other bands use slower release times.<br />
Band 1-5 MaxDeltGR See page 3-59.<br />
B1/B2 Xover (Band 1 to Band 2 Crossover Frequency) sets the crossover frequency<br />
between bands 1 and 2 to either 100 Hz or 200 Hz. It affects the bass texture significantly,<br />
and the best way to understand the differences between the two crossover<br />
frequencies is to listen.<br />
Lookahead activates or defeats the look-ahead functionality in the <strong>AM</strong> multiband<br />
compressor/limiter. Defeating look-ahead improves transient impact at the expense<br />
of distortion, particularly on speech. To mitigate this tradeoff, a selectable “auto”<br />
mode turns look-ahead on for speech material and off for music, using an automatic<br />
speech/music detector. Switching is seamless and click-free because we change the<br />
delay in the compressor control sidechains; this is not a way to reduce the <strong>9400</strong>’s<br />
throughput delay.<br />
Choices are LOOKAHEAD IN, OUT, and AUTO.<br />
Speech is detected if (1) the input is mono, and (2) there are syllabic<br />
pauses at least once every 1.5 seconds. Speech with a stereo music background<br />
will usually be detected as “music,” or the detector may switch