OPTIMOD 6300 DIGITAL
OPERATION
3-37
control to zero. To make the idle gain 2 dB lower than the setting of the
AGC
D
RIVE
control, set the
AGC
I
DLE
G
AIN
control to –2.
AGC Bass Attack
sets the attack time of the AGC bass compressor (below 200Hz).
AGC Master Attack
sets the attack time of the AGC master compressor (above
200Hz).
AGC Bass Release
sets the release time of the AGC bass compressor.
AGC Matrix
allows you to operate the AGC in left/right mode or in sum / difference
mode. Usually you will operate in left/right mode. However, sum / difference mode
can give a type of stereo enhancement that is different from the enhancement
modes offered in the 6300’s built-in stereo enhancer. This will only work if you allow
the two channels of the AGC to have different gains. To do this, set the
AGC
M
AX
D
ELT
GR
control greater than zero.
AGC Max Delta GR
determines the maximum gain difference permitted between
the two channels of the AGC. Set it to “0” for perfect stereo coupling.
This control works the same regardless of whether the AGC operates in
left/right or sum / difference
M
ATRIX
modes, in both cases controlling the
maximum gain difference between the “channels.” Depending on the
Matrix mode setting, the “channels” will handle left and right signals or
will handle sum and difference signals. When the AGC operates in sum /
difference
M
ATRIX
mode, this control determines the maximum amount
of width change in the stereo soundfield.
Master Delta Threshold
allows you to set the difference between the compression
thresholds of the sum and difference channels. (This control is only useful when you
set the
AGC
M
ATRIX
to
SUM/DIF
.) By setting the threshold of the difference channel
lower than the sum channel, you can have the AGC automatically produce more
gain reduction in the difference channel. This will reduce the separation of material
with an excessively wide stereo image (like old Beatles records). To make this work,
you must set the
M
AX
D
ELTA
GR
control away from zero. For example, to limit an ex-
cessively wide image while preventing more than 3 dB difference in gain between
the sum and difference channels, set the
M
AX
D
ELTA
GR
control to 3.0 and the
M
ASTER
D
ELTA
T
HRESHOLD
control to some positive number, depending on how much
automatic width control you want the 6300 to perform
Bass Delta Threshold
works the same as
M
ASTER
D
ELTA
T
HRESHOLD
, but applies to
the bass band. You will usually set it the same as
M
ASTER
D
ELTA
T
HRESHOLD
.
AGC Crossover
allows you to choose
A
LLPASS
or
L
INEAR
N
O
D
ELAY
modes.
A
LLPASS
is a phase-rotating crossover that introduces one pole of phase rotation at
200 Hz. The overall frequency response remains smooth as the two bands take dif-
ferent amounts of gain reduction—the response is a smooth shelf without extra
peaks or dips around the crossover frequency. The two bands are down 3 dB at the
crossover frequency. However, this mode adds group delay distortion and is there-
fore subtly less transparent-sounding than the
L
INEAR
N
O
D
ELAY
mode.
Содержание OPTIMOD 6300
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