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OPTIMOD-PC
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, ra-
ther 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 model 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 oc-
taves 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 "min-
imax" ("minimize the maximum error" or "equal-ripple") IIR digital ap-
proximation to the curves provided by the Orban 622B analog parametric
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.
Equalizer Controls
Group
Bass Shelf
Low
Mid
High
HF Enhancer
DJ Bass (5B)
Highpass Filter
Lowpass Filter
Phase Rotate
Name
Bass Frequency
Bass Gain
Bass Slope
Low Frequency
Low Gain
Low Width
Mid Frequency
Mid Gain
Mid Width
High Frequency
High Gain
High Width
High Frequency En-
hancer
DJ Bass Boost
Highpass Filter
Lowpass Filter
Phase Rotate
Table 3-4: Equalizer Controls
Range
80, 85, 90, 95, 100, 105, 110, 115, 120, 125,
130, 135, 140, 145, 150, 160, 170, 180, 190,
200, 210, 220, 230, 240, 250, 270, 290, 310,
330, 350, 380, 410, 440, 470, 500Hz
0 ... 12 dB
6,12,18 dB/Oct
20 ... 500 Hz
–10.0 ... +10.0 dB
0.8 ... 4 octaves
250 ... 6000 Hz
–10.0 ... +10.0 dB
0.8 ... 4 octaves
1.0 ... 15.0 kHz
–10.0 ... +10.0 dB
0.8 ... 4 octaves
0 ... 15
Off, 1... +10 dB
Off, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110,
120, 130, 140, 150, 170, 200 Hz
10, 11 ,12, 13, 14, 15, 20 kHz
In / Out
3-37
OPERATION
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