OPTIMOD SURROUND PROCESSOR OPERATION
3-57
When the release time of the Five-Band compressor is set towards fast, the setting
of the
MULTIBAND DRIVE 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 Five-Band
compressor 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 Five-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
RELEASE instead.
MB 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
DRIVE.
In the 2.0 processing, the S
PEECH MB RELEASE control overrides the MB RELEASE con-
trol when speech is automatically detected (page 3-6). You may wish to set the
S
PEECH MB RELEASE control faster for speech (to maximize smoothness and uniform-
ity) and slower on music (to prevent excessive build-up of density).
In the surround processing, the C
ENTER MB RELEASE control always sets the release
time of the center channel compressor. This allows you to optimize the center chan-
nel for speech processing.
Multiband Controls
Full Name Advanced Name Range
MB Drive Multiband Drive 0 ... 25
MB Gate Threshold Multiband Gate Threshold Off, –44 ... –5 dB
Loudness Threshold Loudness Controller Threshold Off, 0.0…–24.0 dB
Loudness Attack Loudness Controller Attack 0…100%
Loudness Bass Couple Loudness Controller Bass Cou-ple 0…12 dB, Off
MB Downward Expander Downward Expander Off, –18.0 … 12.0 dB
--- Downward Expander Stereo Couple On, Off [2.0 only]
--- B5 Down Expander Delta Threshold –18.0…+12.0 dB
--- B1/B2 XOVER 100 Hz, 200 Hz
--- B1 MaxDeltGr 0 … 24 dB, Off
--- B2 MaxDeltGr 0 … 24 dB, Off
--- B3 MaxDeltGr 0 … 24 dB, Off
--- B4 MaxDeltGr 0 … 24 dB, Off
--- B5 MaxDeltGr 0 … 24 dB, Off
--- LFE Threshold –16…0 dB, Off
--- LFE Attack 4…50 ms
--- B1>LFE Couple 12…0 dB, Off
Table 3-8: Multiband Controls
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