Orban Optimod-PC 1101, Operating Manual

Page: 183 / 258

OPTIMOD-PC OPERATION
3-63
band. For example, if you set the
M
ULTIBAND
R
ELEASE
control to medium-fast and the
B
AND
3 D
ELTA
GR
control to –2, then the band 3 release time will be the same as if
you had set the
M
ULTIBAND
R
ELEASE
control to medium and set the
B
AND
3 D
ELTA
GR
control to 0. Thus, your settings automatically track any changes you make in the
M
ULTIBAND
R
ELEASE
control. In our example, the release time in band 3 will always be
two “click stops” slower than the setting of the
M
ULTIBAND
R
ELEASE
control.
If your setting of a given
D
ELTA
R
ELEASE
control would otherwise create a release
slower than “slow” or faster than “fast” (the two end-stops of the
M
ULTIBAND
R
ELEASE
control), the band in question will instead set its release time at the appro-
priate end-stop.
Band 1-5 MaxDeltGR controls set the maximum permitted gain difference be-
tween the left and right channels for each band in the multiband limiter. The five-
band processing chain uses a full dual-mono architecture, so the channels can be
operated anywhere from fully coupled to independent. We recommend operating
band 1-4 fully coupled (
B
AND
1-4 M
AX
D
ELT
GR
= 0) for best stereo image stability.
However, audio-processing experts may want to experiment with lesser amounts of
coupling to achieve a wider, “fatter” stereo image at the cost of some image insta-
bility.
B5 M
AX
D
ELT
GR
is set
O
FF
most factory presets. This permits band 5 to be used as a
fast-operating high frequency limiter that works independently on the left and right
channels. This prevents gain reduction in one channel from causing audible spectral
modulation on the other channel. However, the additional stereo difference chan-
nel energy created by independent operation can adversely affect certain low bi-
trate codecs (like WMA). It is wise to do careful listening tests through the codec to
determine if it sounds better with
B5 M
AX
D
ELT
GR = 0
dB.
B1/B2 Crossover (Band 1 to Band 2 Crossover Frequency) sets the crossover fre-
quency between bands 1 and 2 to either 100 Hz or 200 Hz. It significantly affects the
bass texture, and the best way to understand the differences between the two
crossover frequencies is to listen.
B1-B5 Compression Ratio : See page 3-53.
Note that the multiband gate only works appropriately when the
K
NEE
and
R
ATIO
controls of all bands are set identically, which is typically the case in broadcast appli-
cations. We recommend turning off the multiband gate if the individual
K
NEE
and
R
ATIO
settings are unequal.
B1-B5 Knee : See page 3-54.
B1-B5 Breakpoint : See page 3-54.