Orban OPTIMOD 6200, Руководство по эксплуатации

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OPERATION ORBAN Model 6200
Some 6200 users feel that the bass clipper unnecessarily reduces bass punch at its factory
settings. To accommodate these users, the threshold of the bass clipper is user-
adjustable. The range (with reference to the look-ahead limiter threshold) is 0 to –6dB.
As you raise the threshold of the clipper you will get more bass but also more distortion
and pumping. Be careful when setting this control; do not adjust it casually. Listen to
program material with heavy bass combined with spectrally sparse midrange material
(like a singer accompanied by a bass guitar) and listen for IM distortion induced by the
bass’ pushing the midrange into the look-ahead limiter. In general, unless you have a
very good reason to set the control elsewhere, we recommend leaving it at the factory
settings, which were determined as a result of extensive listening tests with many types
of critical program material.
GATE THR (Gate Threshold) control determines the lowest input level that will be
recognized as program by OPTIMOD-DAB; lower levels are considered to be noise or
background sounds, and cause the AGC to gate, effectively freezing gain to prevent
noise breathing.
The gate causes the gain reduction in bands 2 and 3 of the multi-band compressor to
quickly move to the average gain reduction occurring in those bands when the gate first
turns on. This prevents obvious midrange coloration under gated conditions, 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 blatant col-
oration, the gating smoothly preserves the average overall frequency response “tilt” of
the multi-band compressor, broadly maintaining the “automatic equalization” curve it
generates for a given piece of program material.
Note: If the
GATE THR (Gate Threshold) control is turned off, the DJ
BASS
control (in the Equalization screen) is disabled.
MB DRIVE (Multi-Band Drive) control adjusts the signal level going into the multi-
band compressor, and therefore determines the average amount of gain reduction in the
multi-band compressor. Range is 25dB.
Adjust the
MB DRIVE
control to your taste and format requirements. Used lightly with a
slow
or
mslow
(medium-slow) multi-band release time, the multi-band compressor pro-
duces an open, re-equalized sound. The multi-band compressor can increase audio den-
sity when operated at
fast
or
mfast
(medium-fast) release times because it acts more and
more like a fast limiter (not a compressor) as the release time is shortened. With fast and
mfast
(medium-fast) release times, density also increases when you increase the drive
level into the multi-band compressor because these faster release times produce more
limiting action. Increasing density can make sounds seem louder, but can also result in
an unattractive busier, flatter, or denser sound. It is very important to be aware of the
many negative subjective side effects of excessive density when setting controls that af-
fect the density of the processed sound.