Band Processing - Orban OPTIMOD 5750 Operating Manual

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Operation

2 BAND PROCESSING

In addition to five-band processing, suitable for pop music and talk formats, the 5750 offers a very high-quality two-
band algorithm. This is phase-linear and features the same AGC as the five-band processor, followed by a two-band
processor with look-ahead limiting. Sophisticated multiband high frequency limiting and distortion-cancelled clipping
complete the chain.
We believe that this is the ideal processing for classical music because it does not dynamically re-equalize high
frequencies; the subtle HF limiter only acts to reduce high frequency energy when it would otherwise cause overload
because of the FM preemphasis curve. We have heard four-band, allegedly "purist" processing that caused dynamic
HF lift. This created a strident, unnatural sound in strings and brass. In contrast, the 5750's two-band phase-linear
structure keeps the musical spectrum coherent and natural.
The look-ahead limiter prevents speech from being audibly clipped and prevents similar audible problems on
instruments with rapidly declining overtone structures like grand piano, classical guitar, and harp.
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2B (Two Band) DRIVE – Sets the level applied to the 2 Band compressor and, thus, the average amount of
gain reduction.
•
2B (Two Band) MASTER ATTACK – Sets the attack time in the master band.
•
2B (Two Band) BASS ATTACK – Sets the attack time in the bass band.
•
2B (Two Band) RELEASE – Sets the release rate of the 2 band compressor.