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OPTIMOD-PC
LF Gain determines the amount of peak boost or cut (in dB) over a ±10
dB range.
LF Width determines the bandwidth of the equalization, in octaves. The
range is 0.8-4.0 octaves. If you are unfamiliar with using a parametric
equalizer, 1.5 octaves is a good starting point. These curves are relatively
broad because they are designed to provide overall tonal coloration,
rather than to notch out small areas of the spectrum.
The LF parametric can be used in the mid-bass region (100-300Hz) to add
"warmth" and "mellowness" to the sound when boosting. When cutting,
it can remove a "woody" or "boxy" sound.
The equalizer, like the classic Orban analog parametrics such as the 622B,
has constant "Q" curves. This means that the cut curves are narrower
than the boost curves. The width (in octaves) is calibrated with reference
to 10 dB boost. As you decrease the amount of EQ gain (or start to cut),
the width in octaves will decrease. However, the "Q" will stay constant.
"Q" is a mathematical parameter that relates to how fast ringing damps
out. (Technically, we are referring to the "Q" of the poles of the equal-
izer transfer function, which does not change as you adjust the amount
of boost or cut.)
The curves in OPTIMOD-PC's equalizer were created by a so-called
"minimax" ("minimize the maximum error" or "equal-ripple") IIR digital
approximation to the curves provided by the Orban 622B analog para-
metric equalizer. Therefore, unlike less sophisticated digital equalizers
that use the "bilinear transformation" to generate EQ curves, the shapes
of OPTIMOD-PC's curves are not distorted at high frequencies.
Midrange Parametric Equalizer is a parametric equalizer whose boost and cut
curves closely emulate those of an analog parametric equalizer with conventional
bell-shaped curves.
Mid Freq determines the center frequency of the equalization, in Hertz.
Range is 250-6000Hz.
Mid Gain determines the amount of peak boost or cut (in dB) over a ±10
dB range.
Mid Width determines the bandwidth of the equalization, in octaves.
The range is 0.8-4.0 octaves. If you are unfamiliar with using a parametric
equalizer, 1 octave is a good starting point.
With Five-Band presets, the audible effect of the midrange equalizer is
closely associated with the amount of gain reduction in the midrange
bands. With small amounts of gain reduction, it boosts power in the
presence region. This can increase the loudness of such material substan-
tially. As you increase the gain reduction in the midrange bands (by turn-
ing the
control will have progressively less audible effect. The compressor for the
midrange bands will tend to reduce the effect of the
boost (in an attempt to keep the gain constant) to prevent excessive stri-
dency in program material that already has a great deal of presence
power. Therefore, with large amounts of gain reduction, the density of
presence region energy will be increased more than will the level of en-
M
D
(Multiband Drive) control up), the
ULTIBAND
RIVE
OPERATION
M
G
ID
AIN
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frequency
ID
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