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OPTIMOD
setting of the
AGC DRIVE
peaked, and by the setting of the
AGC REL (AGC Release) control provides an adjustable range from 0.5dB/second
(slow) to 20dB/second (fast). The increase in density caused by setting the
control to fast settings sounds different than the increase in density caused by setting the
control to
MB REL
Unless it is purposely speeded-up (with the AGC
control (AGC) that occurs in the AGC prior to the multi-band compressor makes audio
levels more consistent without significantly altering texture. Then the multi-band com-
pression and associated multi-band clipper audibly change the density of the sound and
dynamically re-equalize it as necessary (booming bass is tightened; weak, thin bass is
brought up; highs are always present and consistent in level).
The various combinations of AGC and compression offer great flexibility:
•
Light AGC + light compression yields a wide sense of dynamics, with a small
amount of automatic re-equalization.
•
Moderate AGC + light compression produces an open, natural quality with auto-
matic re-equalization and increased consistency of frequency balance.
•
Moderate AGC + moderate compression gives a more dense sound, particularly as
the release time of the multi-band compressor is sped up.
•
Moderate AGC + heavy compression (particularly with a
time) results in a "wall of sound" effect, which may cause listener fatigue.
Adjust the AGC (with the
action, and then fine-tune the compression and clipping with the Multi-Band structure's
controls.
AGC B CPL (AGC Bass Coupling) determines the amount of bass coupling in the two-
band AGC. Because the AGC is generally operated slowly, one usually sets this control
at 80% or higher to prevent the AGC from significantly changing the frequency balance
of the program material. "Automatic equalization" is ordinarily done in the two-band
compressor section following the AGC. For a further discussion see BASS CPL on page
3-24.
BASS CLIP threshold controls Orban's patented embedded bass clipper. It is embedded
in the multi-band crossover so that harmonics created by clipping are rolled off by part
of the crossover filters. The threshold of this clipper is ordinarily set between 4dB and
6dB below the threshold of the final limiter in the processing chain, depending on the
setting of the
LESS-MORE
adjustments. This provides headroom for contributions from the other
FULL CONTROL
four bands, so that bass transients don't smash against the look-ahead limiter, causing
overt intermodulation distortion between the bass and higher frequency program mate-
rial.
control, by the level at which the console VU meter or PPM is
MB DRIVE
, and you can trade the two off to produce different effects.
fast
control) to produce the desired amount of AGC
AGC DRIVE
control in the parent preset upon which you are basing your
(compressor) control.
control), the automatic gain
MB REL
fast
OPERATION
AGC REL
multi-band release
3-29
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