OPTIMOD-FM OPERATION
3-27
midrange bands (by turning the MB Drive (Multiband Drive) control up), the
Mid Gain control will have progressively less audible effect. The compressor
for the midrange bands will tend to reduce the effect of the Mid frequency
boost (in an attempt to keep the gain constant) to prevent excessive stridency
in program material that already has a great deal of presence power. There-
fore, with large amounts of gain reduction, the density of presence region
energy will be increased more than will the level of energy in that region.
Because the 3.7 kHz band compressor is partially coupled to the gain reduc-
tion in the 6.2 kHz band in most presets, tuning
Mid Freq to 2-4 kHz and
turning up the
Mid Gain control will decrease energy in the 6.2 kHz band—
you will be increasing the gain reduction in both the 3.7 kHz and 6.2 kHz
bands. You may wish to compensate for this effect by turning up the
Bril-
liance
control.
Use the mid frequency equalizer with caution. Excessive presence boost
tends to be audibly strident and fatiguing. Moreover, the sound quality, al-
though loud, can be very irritating. We suggest a maximum of 3 dB boost,
although 10 dB is achievable. In some of our factory presets, we use 3 dB
boost at 2.6 kHz to bring vocals more up-front.
High Frequency Parametric Equalizer is a parametric equalizer whose boost and cut
curves closely emulate those of an analog parametric equalizer with conventional bell-
shaped curves.
High Frequency
determines the center frequency of the equalization, in Hertz.
The range is 1-15 kHz
High Gain
determines the amount of peak boost or cut over a ±10 dB range.
High 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 equal-
izer, one octave is a good starting point.
Excessive high frequency boost can exaggerate tape hiss and distortion in
program material that is less than perfectly clean. We suggest no more than
4 dB boost as a practical maximum, unless source material is primarily from
compact discs of recently recorded material. In several of our presets, we use
this equalizer to boost the upper presence band (4.4 kHz) slightly, leaving
broadband HF boost to the
Brilliance and/or HF Enhance controls.
Brilliance controls the drive to Band 5. The high frequency limiter and Band 5 clipper
dynamically control these boosts, protecting the final clipper from excessive HF drive.
We recommend a maximum of 4 dB of
Brilliance boost, and most people will prefer sub-
stantially less.
DJ Bass
control determines the amount of bass boost produced on some male voices. In
its default
Off position, it causes the gain reduction of the lowest frequency band to move
quickly to the same gain reduction as its nearest neighbor when gated. This fights any
tendency of the lowest frequency band to develop significantly more gain than its
neighbor when processing voice because voice will activate the gate frequently. Each
time it does so, it will reset the gain of the lowest frequency band so that the gains of the
two bottom bands are equal and the response in this frequency range is flat. The result is
natural-sounding bass on male voice.
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