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3-40
OPERATION
The Two-Band Structure
Customizing the Settings
a cleaner sound.
When you use OPTIMOD-PC in a preemphasized mode (step 5 on page 2-24), this
inserts a frequency-dependent high frequency boost before the look-ahead limiter.
This boost can be as large as 20 dB at 20 kHz. When using preemphasis, you must
turn down the F
L
INAL
ing audible gain pumping.
You may find it illuminating to recall several Factory Presets, adjust L
M
to several points in its range, and then open the Full Control screen
ORE
to examine the trade-offs between the release time and F
made by the factory programmers. However, note that all Factory Presets
were created to complement F
must turn down the F
The Two-Band structure consists of a stereo enhancer, a slow two-band gated AGC
for gain riding, an equalization section, a gated two-band compressor, and a low-IM
look-ahead limiter. It shares the stereo enhancer, AGC, equalizer, and look-ahead
limiter with the Five-Band structure. The Two-Band and Five-Band compressors are
always active simultaneously. OPTIMOD-PC switches between the structures by send-
ing the output of the desired compressor to the look-ahead limiter's input. Switch-
ing between the compressors occurs via a smooth cross-fade.
OPTIMOD-PC's Two-Band Structure can be made phase-linear throughout to maxi-
mize sonic transparency. However, you can also choose an allpass crossover structure
(see AGC C
on page 3-37).
ROSSOVER
The Two-Band structure has an open, easy-to-listen-to sound that is similar to the
source material if the source material is of good quality. However, if the spectral
balance between the bass and high frequency energy of the program material is
incorrect, the Two-Band structure (when its B
ward 0%) can gently correct it without introducing obvious coloration.
If you need these automatic re-equalization capabilities of the Two-Band
structure, you may find one of the Five-Band presets to be even more ef-
fective.
There are several Two-Band presets. See Table 3-2: Radio-Style Presets on page 3-21.
The P
preset uses the Two-Band structure. In this preset, the stereo en-
-0
ROTECT
DB
hancer, AGC, and equalizer are defeated via their user controls.
Each Two-Band Factory Preset has a L
screen) that adjusts loudness. L
controls to optimize the trade-offs between unwanted side effects as processing
levels are decreased or increased.
D
control to prevent the look-ahead limiter from caus-
IMIT
RIVE
LAT
L
D
INAL
IMIT
RIVE
-M
ESS
-M
simultaneously adjusts all of the processing
ESS
ORE
INAL
preemphasis. As explained above, you
control when using preemphasis.
C
control is operated to-
ASS
OUPLING
control (located in the Basic Modify
ORE
ORBAN MODEL 1100
-
ESS
drive
L
IMIT
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