Orban Optimod-PC 1101, Operating Manual

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OPTIMOD-PC OPERATION
3-53
imum loudness and density on small radios achievable by the Two-Band structure.
However, such processing may fatigue listeners with high-quality receivers, and re-
quires you to activate the AGC to control the average drive level into the two-band
compressor, preventing uncontrolled build-up of program density. Instead of oper-
ating the Two-Band structure like this, you should choose a Five-Band preset instead.
Bass Clip (“Bass Clip Threshold”): See page 3-47.
2B Clip is a compression threshold control that equally affects the bass and master
bands. It sets the drive level into the look-ahead limiter.
2B High Frequency Limiting sets the threshold of the high frequency limiter in the
Two-Band structure. When this control is set lower, gain reduction does more high
frequency limiting. When this control is set higher, distortion-cancelled clipping does
more high frequency limiting. This control controls the tradeoff between loss of
high frequencies (due to high frequency limiting) and excessive distortion (due to
clipping).
FINAL LIMT (“Final Limit Drive”): See page 3-48.
2B Master Compression Threshold sets the level where gain reduction starts to
occur in the Master (above 200Hz) band of the Two-Band Compressor.
2B Bass Threshold determines the compression threshold of the bass band (below
200 Hz) in the Two-Band Compressor. It can be used to set the target spectral bal-
ance of the Two-Band Compressor.
As the Two-Band Compressor
B
ASS
C
PL
control is moved towards “100%,” the
2B B
ASS
T
HRESHOLD
control affects the sound less and less.
2B Master Attack sets the attack time of the Two-Band Compressor master com-
pressor (above 200Hz).
2B Bass Attack sets the attack time of the Two-Band Compressor bass compressor
(below 200Hz).
2B Crossover sets the structure of the two-band crossover to Allpass or Linear. See
AGC C
ROSSOVER
on page 3-45 for more detail about these modes.
2B Master Comp Ratio and 2B Bass Comp Ratio set the compression ratio of the
Master compressor and Bass compressor respectively at their thresholds of compres-
sion. Beyond threshold, the ratio increases with increased gain reduction until it be-
comes
∞
:1 at the amount of gain reduction (in dB) set by the 2B M
ASTER
K
NEE
con-
trol. When you adjust these controls, the thresholds of the multiband compressors
change automatically so that the total amount of gain reduction stays approxi-
mately the same. (This automatic adjustment is internal to the 1101’s DSP; the
MB
T
HRESH
controls’ displayed settings do not show it.)
To achieve a classic soft knee characteristic, set the 2
B M
ASTER
C
OMP
R
ATIO
control to
1:1 and set the K
NEE
control to the gain reduction in dB at which you wish the com-