Orban OPTIMOD 6300, Руководство по эксплуатации

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3-50
OPERATION ORBAN MODEL 6300
primary danger is that the excessive drive will cause noise to be increased excessively
when the program material becomes quiet. You can minimize this effect by activat-
ing the single-ended noise reduction and/or by carefully setting the
M
ULTIBAND
G
ATE
T
HRESHOLD
control to freeze the gain when the input gets quiet.
When the release time of the 5-band compressor is set towards fast, the setting of
the
M
ULTIBAND
D
RIVE
control becomes much more critical to sound quality because
density increases as the control is turned up. Listen carefully as you adjust it. With
these fast release times, there is a point beyond which increasing the 5-band com-
pressor drive will no longer yield more loudness, and will simply degrade the punch
and definition of the sound. Instead, let the AGC do most of the work.
Because excessive loudness is an irritant in sound for picture, there is almost never
any reason to push processing to the point where it degrades the audio. We recom-
mend no more than 10dB gain reduction as shown on the meters for Band 3. More
than 10dB, particularly with the fast release time, will often create a wall of sound
effect that many find fatiguing.
To avoid excessive density with fast 5-band release time, we recommend using no
more than 5dB gain reduction in band 3, compensating for any lost loudness by
speeding up the
AGC R
ELEASE
instead.
MB REL (“Multiband Release”) control can be switched to any of seven settings. To
understand how to adjust this control for sound-for-picture programming, please
see the discussion above under
MB D
RIVE
.
The
S
PEECH
MB R
ELEASE
control overrides the
MB R
ELEASE
control when OPTIMOD-
PC automatically detects speech (page 3-5). You may wish to set the S
PEECH
MB
R
ELEASE
control faster for speech (to maximize smoothness and uniformity) and
slower on music (to prevent excessive build-up of density).
Compression Threshold; Speech Compression Threshold controls set the com-
pression threshold for music and speech in each band (following OPTIMOD-PC’s
automatic speech/music discriminator), in units of dB. We recommend making small
changes around the factory settings to preserve the internal headroom built into
the processing chain. These controls will affect the spectral balance of the processing
above threshold, but are also risky because they can significantly affect the amount
of distortion produced by the look-ahead limiter.