Orban OPTIMOD 8685, Operating Manual

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OPTIMOD SURROUND PROCESSOR OPERATION
3-49
significantly increasing program density. Hence, it is mainly useful for unobtrusive
gain riding in sound-for-picture applications and in fine arts programming.
If you need processing for loudness and/or processing that automatically
corrects spectral balance inconsistency in the source material, we recom-
mend using the Five-Band structure instead. We tend to prefer the Five-
Band structure in sound-for-picture applications because it can use the
AGC for gentle two-band gain riding while using the five-band compres-
sor/limiter to de-ess dialog without causing gain pumping.
There are several Two-Band presets for sound-for-picture and radio-style processing.
See Table 3-2 on page 3-31, Table 3-3 on page 3-33, and Table 3-1 on page 3-27.
Customizing the Settings
Each Two-Band Factory Preset has a
L
ESS
-M
ORE
control (located in the Basic Modify
screen) that adjusts on-air loudness. L
ESS
-M
ORE
simultaneously adjusts all of the
processing controls to optimize the trade-offs between unwanted side effects as
processing levels are decreased or increased.
If you wish, you may adjust the Modify parameters to your own taste. Always start
with
L
ESS
-M
ORE
to get as close to your desired sound as possible. Then edit the Mod-
ify parameters using the Basic, Intermediate or Advanced Modify screen, and save
those edits to a User Preset.
The Two-Band Structure’s Full and Advanced Setup Controls
The tables below show a summary of the Two-Band controls in the dynamics section.
AGC, Equalizer, and Clipper controls are common to both Two-Band and Five-Band
structures and are described in the pages above.
Some of the Two-Band controls are common to the Intermediate Modify and Ad-
vanced Modify screens, with additional Two-Band controls available in the Advanced
Modify screen. (Note that “advanced” controls are accessible only from 8685 PC Re-
mote software.)
2B Drive
control adjusts signal level going into the two-band compressor, determin-
ing the amount of gain reduction in the two-band compressor.
Regardless of the release time setting, we feel that the optimal amount of gain re-
duction in the two-band compressor for sound-for-picture applications is 10-15dB.
For fine arts formats, operating with 0-10 dB of gain reduction (with the gain riding
AGC set to O
FF
) maintains a sense of dynamic range while still controlling levels ef-
fectively.
2B Release control determines how fast the two-band compressor releases (and
therefore how quickly loudness increases) when the level of the program material
decreases. This release time only applies when the silence gate does not gate the
Two-Band Compressor.