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OPERATION ORBAN MODEL 8685
DRAMA preset, which preserves more of the mixes’ original dynamic range.
TV 2B GEN PURP NO LC (TV Two-Band General Purpose without Loudness Control-
ler): This preset is the same as TV
2B-GEN PURPOSE except the Loudness Controller
is turned off and the MB
DRIVE control is backed off by 3 dB to achieve approxi-
mately the same loudness as TV
2B-GEN PURPOSE. Because the Loudness Controller
is inactive, this preset has more dynamic punch than TV
2B-GEN PURPOSE, but the
loudness of highly processed material (like commercials with a lot of midrange
boost) may be objectionably loud.
TV 5B-GEN PUR W/NR (TV Five-Band General Purpose with Noise Reduction): pro-
vides effective dynamic range control and “automatic re-equalization” of most dra-
matic material. It uses the Loudness Controller to control loudness tightly. It applies
single-ended noise reduction to the material, which will reduce unwanted noise like
hiss, hum, or stage rumble. However, it will also reduce ambience. If the program
material is carefully produced (as are most contemporary feature-film soundtracks),
you may wish to use TV
5B-GEN PURPOSE (which does not apply noise reduction), or,
if the material is so well produced that it would not benefit from “automatic re-
equalization,” use TV
2B-GEN PURPOSE.
TV 5B-GEN PURPOSE (TV Five-Band General Purpose without Noise Reduction): is
identical to TV
5B-GEN PUR W/NR except that the single-ended dynamic noise reduc-
tion system is off.
TV 5B GEN PURP NO LC (TV Five-Band General Purpose without Loudness Control-
ler): This preset is the same as TV
5B-GEN PURPOSE except the Loudness Controller
is turned off and the MB
DRIVE control is backed off by 3 dB to achieve approxi-
mately the same loudness as TV
5B-GEN PURPOSE. Because the Loudness Controller
is inactive, this preset has more dynamic punch than TV
5B-GEN PURPOSE. The five-
band processing makes the audio spectrum more consistent than does TV
2B-GEN
PURP NO LC, so TV 5B-GEN PURP NO LC controls loudness better than TV 2B-GEN
PURP NO LC even though the Loudness Controller is inactive.
TV 2B-DRAMA (TV Two-Band Drama): uses the 8685’s soft knee compression and
AGC
RAT IO control to regulate loudness while still preserving some of the dynamic
range of the original mix. This preset sounds very smooth and natural with modern
surround sound mixes for scripted dramas. The 8685’s Loudness Controller is ex-
ploited to limit loudness to a maximum level. Typically, the Loudness Controller will
produce 1 to 3 dB of gain reduction with dialog at normal levels and may produce as
much as 12 dB of gain reduction with very loud sound effects or commercials.
Because it preserves some dynamic range, it is important that the input level to the
8685 not be too far awry. Usually, network feeds will meet this requirement but lo-
cal playout of older material that has not been checked for loudness by a long-term
Loudness Level meter like ITU-R BS.1770 may not work well. Use one of the general-
purpose presets for this kind of material.
TV 5B-DRAMA (TV Five-Band Drama): like its 2B counterpart, uses the 8685’s soft
knee compression and AGC
RATI O control to regulate loudness while still preserving
some of the dynamic range of the original mix. In addition, the five-band compres-
sor automatically re-equalizes material that may otherwise sound spectrally unbal-
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