OPTIMOD-AM DIGITAL OPERATION
3-35
sponse in this frequency range is flat. The result is natural-sounding bass on male
voice.
If you like a larger-than-life, “chesty” sound on male voice, set this control away
from O
FF. Then, gating causes the gain reduction of the lowest frequency band to
move to the same gain reduction (minus a gain offset equal to the numerical setting
of the control) as its nearest neighbor when gated. You can therefore set the maxi-
mum gain difference between the two low frequency bands, producing consider-
able dynamic bass boost on voice.
The difference will never exceed the difference that would have otherwise occurred
if the lowest frequency band were independently gated. If you are familiar with
older Orban processors, this is the maximum amount of boost that would have oc-
curred if you had set their
DJ BASS BOOST controls to ON.
The amount of bass boost will be highly dependent on the fundamental frequency
of a given voice. If the fundamental frequency is far above 100Hz, there will be little
voice energy in the bottom band and little or no audio bass boost can occur even if
the gain of the bottom band is higher than the gain of its neighbor. As the funda-
mental frequency moves lower, more of this energy leaks into the bottom band,
producing more bass boost. If the fundamental frequency is very low (a rarity), there
will be enough energy in the bottom band to force significant gain reduction, and
you will hear less bass boost than if the fundamental frequency were a bit higher.
If the MB G
ATE THRESH (Gate Threshold) control is turned OFF, the DJ BASS boost set-
ting is disabled.
BRILLIANCE
sets the drive level into the Band 5 compressor in the digital radio
channel only. Because band 4 gain reduction determines band 5 gain reduction, this
control has the same effect as the B
AND 5 OUTPUT MIX control. It is included only for
compatibility with Orban’s 8400 and 8500 HD processors so that you can duplicate
the sound of these processors’ presets by copying their control settings to the 9400.
HF ENH
(“High Frequency Enhancer”) is a program-adaptive 6 dB/octave shelving
equalizer with a 4 kHz turnover frequency. It constantly monitors the ratio between
high frequency and broadband energy and adjusts the amount of equalization in an
attempt to make this ratio constant as the program material changes. It can there-
fore create a bright, present sound without over-equalizing material that is already
bright.
LOWPASS
("Lowpass Filter Cutoff Frequency") allows you to decrease (but not in-
crease) the low-pass cutoff frequency compared to its setting in active transmission
preset. See (7.B) on page 2-26.
LPF SHAPE
("Lowpass Filter Shape") allows you to decrease (but not increase) the
low-pass filter's shape compared to its setting in active transmission preset. See step
(7.C) on page 2-27.
HIGHP
ASS
("Highpass Filter Cutoff Frequency") allows you to increase (but not de-
crease) the highpass cutoff frequency compared to its setting in active transmission
preset. See step( 7.D) on page 2-28.
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