3-28
OPERATION
ORBAN MODEL 8300
processing (such as a
CLASSICAL
preset). The AGC is also ordinarily defeated if you
are using a studio level controller (like Orban’s 8200ST). However, in this case it is
better to defeat the AGC globally in System Setup.
AGC DRIVE
control adjusts signal level going into the slow dual-band AGC, and
therefore determines the amount of gain reduction in the AGC. This also adjusts the
“idle gain” — the amount of gain reduction in the AGC section when the structure
is gated. (It gates whenever the input level to the structure is below the threshold of
gating.)
The total amount of gain reduction in the Five-Band structure is the sum of the gain
reduction in the AGC and the gain reduction in the multiband compressor. The total
system gain reduction determines how much the loudness of quiet passages will be
increased (and, therefore, how consistent overall loudness will be). It is determined
by the setting of the
AGC
D
RIVE
control, by the level at which the console VU meter
or PPM is peaked, and by the setting of the
M
ULTIBAND
D
RIVE
(compressor) control.
AGC REL
(“AGC Master Release”) control provides an adjustable range from 0.5
dB/second (slow) to 20 dB/second (fast). The increase in density caused by setting the
AGC
R
ELEASE
control to fast settings sounds different from the increase in density
caused by setting the Multiband’s
M
ULTIBAND
R
ELEASE
control to
F
AST
, and you can
trade the two off to produce different effects.
Unless it is purposely speeded-up (with the
AGC
R
ELEASE
control), the automatic
gain control (AGC) that occurs in the AGC prior to the multiband compressor makes
audio levels more consistent without significantly altering texture. Then the multi-
band compression and associated multiband 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
automatic re-equalization and increased consistency of frequency balance.
Moderate AGC + moderate compression gives a more dense sound, particularly
as the release time of the multiband compressor is sped up.
Moderate AGC + heavy compression (particularly with a
FAST
multiband release
time) results in a “wall of sound” effect, which may cause listener fatigue.
Adjust the AGC (with the
AGC
D
RIVE
control) to produce the desired amount of
AGC action, and then fine-tune the compression and clipping with the Five-Band
structure’s controls.
AGC GATE
(“AGC Gate Threshold”) control determines the lowest input level that
will be recognized as program by OPTIMOD-FM; lower levels are considered to be
Summary of Contents for 8300J
Page 1: ...Operating Manual OPTIMOD FM 8300 Digital Audio Processor Version 2 1 Software...
Page 7: ...Operating Manual OPTIMOD FM 8300 Digital Audio Processor Version 2 1 Software...
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Page 247: ...OPTIMOD FM DIGITAL TECHNICAL DATA 6 29...
Page 254: ...6 36 TECHNICAL DATA ORBAN MODEL 8300 CPU Module...
Page 260: ...6 42 TECHNICAL DATA ORBAN MODEL 8300 8300 RS232 BOARD PARTS LOCATOR...
Page 262: ...6 44 TECHNICAL DATA ORBAN MODEL 8300 8300 POWER SUPPLY PARTS LOCATOR...
Page 264: ...6 46 TECHNICAL DATA ORBAN MODEL 8300 8300 I O BOARD PARTS LOCATOR...
Page 270: ...6 52 TECHNICAL DATA ORBAN MODEL 8300 DSP BOARD PARTS LOCATOR DRAWING 32170 000 14...
Page 278: ...6 60 TECHNICAL DATA ORBAN MODEL 8300 8300 DISPLAY BOARD PARTS LOCATOR...
Page 279: ...OPTIMOD FM DIGITAL TECHNICAL DATA 6 61 DISPLAY BOARD...
