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OPERATION ORBAN Model 8400
when the gate first turns on. This prevents obvious midrange coloration under gated con-
ditions, because bands 2 and 3 have the same gain.
The gate also independently freezes the gain of the two highest frequency bands (forcing
the gain of the highest frequency band to be identical to its lower neighbor), and inde-
pendently sets the gain of the lowest frequency band according to the setting of the
DJ
Bass
boost control (in the Equalization screen). Thus, without introducing obvious col-
oration, the gating smoothly preserves the average overall frequency response “tilt” of the
multiband compressor, broadly maintaining the “automatic equalization” curve it gener-
ates for a given piece of program material.
Note: If the MB Gate Thresh (Gate Threshold) control is turned Off, the DJ
Bass
control (in the Equalization screen) is disabled.
MB Clipping sets the drive level to the multiband distortion controlling processing that
precedes the final clipping section. The distortion-controlling section uses a combination
of distortion-cancelled clipping and look-ahead processing to anticipate and prevent ex-
cessive clipping distortion in the final clipper.
Like any other dynamics processing, the distortion-controlling section can produce arti-
facts of its own when overdriven. These artifacts can include loss of definition, smeared
high frequencies, a sound similar to excessive compression, and, when operated at ex-
treme settings, audible intermodulation distortion. You can adjust the
MB Clipping control
to prevent such artifacts or to use them for coloration in “highly processed” formats.
MB Down Expander (Multiband Downward Expander Threshold)
determines the
level below which the single-ended noise reduction system’s downward expander begins
to decrease system gain, and below which the high frequencies begin to become low-pass
filtered to reduce perceived noise. Activate the single-ended dynamic noise reduction by
setting the
MB Down Expander control to a setting other than Off.
The single-ended noise reduction system combines a broadband downward expander with
a program-dependent low-pass filter. These functions are achieved by causing extra gain
reduction in the multiband compressor. You can see the effect of this extra gain reduction
on the gain reduction meters.
Ordinarily, the gating on the AGC and multiband limiter will prevent objectionable build-
up of noise, and you will want to use the single-ended noise reduction only on unusually
noisy program material. Modern commercial recordings will almost never need it. We
expect that its main use will be in talk-oriented programming, including sports.
Please note that it is impossible to design such a system to handle all program material
without audible side effects. You will get best results if you set the
MB Down Expander
control of the noise reduction system to complement the program material you are proc-
essing. The
MB Down Expander should be set higher when the input is noisy and lower
when the input is relatively quiet. The best way to adjust the
MB Down Expander control
is to start with the control set very high. Reduce the control setting while watching the
gain reduction meters. Eventually, you will see the gain increase in sync with the pro-
gram. Go further until you begin to hear noise modulation—a puffing or breathing sound
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