Orban OPTIMOD-AM 9300, Руководство по эксплуатации

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3-20
OPERATION ORBAN MODEL 9300
stant) to prevent excessive stridency in program material that already has a great
deal of presence power. Therefore, with large amounts of gain reduction, the den-
sity of presence region energy will be increased more than will the level of energy in
that region.
We advise using this control conservatively, because excessive midrange boost can
sound strident and fatiguing. Further, bear in mind that any equalization that af-
fects frequencies above about 3kHz will affect wideband and narrowband radios
very differently; the narrowband radios will reproduce very little of the above-3kHz
equalization. So, if there are wideband radios in the hands of your audience, be sure
to double-check your sound on both wideband and narrowband radios before set-
tling on a setting for the midrange equalization.
A 1 kHz boost is particularly effective in increasing the loudness of the low-quality
radios that are down about 3dB at 2kHz with steep-slope rolloff thereafter (the
third group of radios described in
Reference Radios for the Processing on page 3-7).
If you are going to do this, set the equalizer's
B
ANDWIDTH to approximately two oc-
taves.
We do not recommend this 1 kHz equalization if you want a sound that is competi-
tive with FM, because it will produce the old-fashioned AM honk. We do not believe
that type of sound is appropriate for the tastes of today's audiences. The 1kHz boost
should be used only as a last resort - the resulting sound will be louder, but it will
also be far less competitive with FM.
High Frequency Parametric Equalizer is a parametric equalizer whose boost and
cut curves closely emulate those of an analog parametric equalizer with conven-
tional bell-shaped curves.
HIGH FREQ 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
equalizer, one octave is a good starting point.
Excessive high frequency boost can exaggerate hiss and distortion in program mate-
rial that is less than perfectly clean. We suggest no more than 4 dB boost as a practi-
cal maximum, unless source material is primarily from compact discs of recently re-
corded 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
B
RILLIANCE
and/or
HF E
NHANCE
controls.
HF Gain (“High Frequency Shelf Gain”) determines the amount of high frequency
boost provided by the 9300’s receiver equalizer.
HF Curve (“High Frequency Shelf Curve”) determines the shape of the high fre-
quency shelving curves curve produced by the 9300’s receiver equalizer. (See Figure
3-1.)