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3-36
OPERATION
is set to 4 dB and the master gain reduction is 10 dB, the bass gain reduction cannot
decrease below 6 dB even if the gain reduction signal from the Bass compressor
sidechain is lower. However, the audio path bass gain reduction can be larger than
the master gain reduction without limit. In the previous example, the bass gain re-
duction could be 25 dB
The normal setting of the AGC B
bass band to correct excessive bass as necessary but does not permit it to provide a
dynamic bass boost.
Note that the operation of this control was changed in V2.1 software to work as ex-
plained above. You may have to tweak this control to achieve the same bass balance
that you had previously with V2.0 software.
Window Size determines the size of the floating "slow zone" window in the mas-
ter band of the AGC. (The Bass band is not windowed.)
The window works by slowing down changes in the AGC gain reduction that are
smaller than the W
INDOW
AGC gain reduction. For example, if the W
tends 4 dB in the release direction and 2 dB in the attack direction.
If the AGC needs to respond to a large change in its input level by making a gain
change that is larger than the window, then the AGC's attack and release controls
determine the AGC's response time. However, if the change in input level is smaller
than the window size, the W
lease times. This is usually much slower than the normal AGC time constants. This
prevents the AGC from building up density in material whose level is already well
controlled.
The previous explanation was somewhat simplified. In fact, the window has "soft
edges." Instead of switching abruptly between time constants, the attack and re-
lease times morph smoothly between the setting of the W
the setting of the AGC master release and attack controls.
The normal setting for the W
Window Release (see W
AGC Ratio determines the compression ratio of the AGC. The compression ratio is
the ratio between the change in input level and the resulting change in output
level, both measured in units of dB.
OPTIMOD-PC compressor can be operated at a compression ratio as low as 2:1. This
can add a sense of dynamic range and is mostly useful for subtle fine arts formats
like classical and jazz.
AGC Bass Threshold determines the compression threshold of the bass band in the
AGC. It can be used to set the target spectral balance of the AGC.
control is 0 dB, which allows the AGC
C
ASS
OUPLING
S
. The window has 2:1 asymmetry around the current
IZE
INDOW
R
control determines the attack and re-
INDOW
ELEASE
S
INDOW
IZE
S
above.)
INDOW
IZE
ORBAN MODEL 1101
is set to 4 dB, the window ex-
S
IZE
R
INDOW
ELEASE
is 3 dB.
control and
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