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OPERATION ORBAN MODEL 9400
Although it is located in the Multiband Full Modify screen (to make it easy for a pre-
set developer to switch meter modes), this control is not part of the active preset
and its setting is not saved in User Presets, unlike the other controls in the Full Mod-
ify screens. The meter mode always reverts to M
ASTER when the user leaves Full
Modify.
Because it only affects the front panel display, this control is not available
in PC Remote.
Advanced AGC Controls
The following AGC controls are available only in the 9400 PC Remote software.
AGC Maximum Delta Gain Reduction
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
ATR IX modes. In both cases, it controls the maximum gain difference
between the “channels.” Depending on the M
ATR IX 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
ATR IX mode, this control determines the maxi-
mum amount of width change in the stereo soundfield.
AGC Window Size
determines the size of the “target zone” window in the AGC. If
the input level falls within this target zone, the AGC release time is set to the num-
ber specified by the AGC W
INDOW RELEASE control. This is usually much slower than
the normal AGC release, and essentially freezes the AGC gain. This prevents the AGC
from building up density in material whose level is already well controlled. If the
level goes outside the window, then the AGC switches to the release rate specified
by AGC
MASTER RELEASE, so the AGC can still correct large gain variations quickly.
The normal setting for the AGC
WINDOW SIZE is 3dB.
AGC Window Release
(see AGC WINDOW SIZE above.)
AGC Matrix
allows you to operate the AGC in left/right mode or in sum/difference
mode. Because the envelope modulation in CQUAM AM stereo is the sum signal,
operating the AGC in sum/difference mode can help maximize loudness on mono
radios.
Additionally, sum/difference mode can give a type of stereo enhancement that is
different from the enhancement modes offered in the 9400’s built-in stereo enhan-
cer. This will only work if you allow the two channels of the AGC to have different
gains. To do this, set the AGC
MAXIMUM DELTA GAIN REDUCTION control greater than
zero.
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.
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