Optimod-Surround 8685 V1.0 Operating Manual - Orban

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OPERATION ORBAN MODEL 8685
without objectionable side effects, so the 8685 can create competitively loud masters.
Radio-Style Presets
The radio-style presets (Table 3-3 on page 3-33) have been named similarly to their
radio counterparts in Orban’s OPTIMOD 8500 and 6300. Their basic audio texture is
very similar to the presets in these products. The loudness controller is turned off.
CLASSICAL: As their names imply, the CLASSICAL 5-BAND and CLASSICAL TWO-
BAND presets are optimized for classical music, gracefully handling recordings with
very wide dynamic range and sudden shifts in dynamics. The Five-Band version uses
heavy inter-band coupling to prevent large amounts of automatic re-equalization,
which could otherwise cause unnatural stridency and brightness in strings and horns
and which could pump up very low frequency rumble in live recording venues.
The Five-Band preset defeats the AGC, using only the five-band compressor for gain
reduction. It also defeats phase rotation to ensure the most transparent Five-Band
sound available.
CLASSICAL-5B+AGC uses the AGC set for 2:1 compression ratio. Because of the
AGC, it affects more of the total dynamic range of the recording than does the
CLASSICAL-5 BAND preset. However, the AGC provides extremely smooth and unobtrusive
compression because of the gentle ratio and window gating. This preset
uses the Five-Band compressor very lightly with a fast release time as a peak limiter.
The AGC does almost all of the compression.