Orban OPTIMOD 6300, Руководство по эксплуатации

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OPTIMOD 6300 DIGITAL OPERATION
3-67
See Protection and AGC Presets on page 3-17 for a description of these
presets.
C) If you have started with one of the
S
OFT
K
NEE
presets, the AGC will already be
O
FF
.
If you need a very large amount of compression for an application like
processing material intended for in-flight entertainment systems, you can ei-
ther edit the preset to turn the AGC on or start with a preset other than
S
OFT
K
NEE
.
You can turn the AGC off globally for all presets, which is convenient if
you don’t expect to use it in the future. (See step 2 on page 2-21.)
D) The purpose of the MB gate is to prevent background noise from being
sucked up when the program material is very quiet. (See page 3-50.) Unless
you will be using more than approximately 6dB of compression for special ap-
plications, set the
MB G
ATE
T
HRESHOLD
to
O
FF
.
In the
S
OFT
K
NEE
and
L
OOK
-A
HEAD
L
IMITER
presets, this is already done.
The multiband gate only works appropriately when the
K
NEE
and
R
ATIO
controls of all bands are set identically, which is typically true in broad-
cast applications. We recommend turning off the multiband gate if the
individual
K
NEE
and R
ATIO
settings are unequal.
E) If you are using the 5-band structure, choose the crossover frequency between
bands 1 and 2 via the
B1/B2 C
ROSSOVER
control. The available settings are 100
Hz and 200 Hz.
The crossover frequency significantly affects the bass texture and the best
way to understand the differences between the two crossover frequen-
cies is to listen. We prefer 100 Hz for most mastering applications be-
cause it puts most of low instrumental bass energy (typically kick drum
and bass) in band 1 and most vocal fundamentals in band 2, allowing
these crucial mix elements to be adjusted more independently.
F) Adjust the 2
B
D
RIVE
control (2-band) or M
B
D
RIVE
control (5-band) to achieve
the desired amount of multiband gain reduction.
G) Adjust the release time control (
2
B
R
ELEASE
or
M
B
R
ELEASE
) to achieve the de-
sired compression density.
If you are using the 5-band structure, you can use the
D
ELTA
R
ELEASE
con-
trols to fine-tune the release time of each band independently.
The release characteristic is always “automatic” (i.e., multiple time con-
stant), and the
R
ELEASE
control simply scales this process. This, combined
with multiband operation, makes the compression remarkably resistant
to the usual compressor pumping and squashing.
H) Adjust the A
TTACK
T
IME
controls on the individual compressors to trade off
overshoot control against transient punch.
I) Adjust the R
ATIO
and K
NEE
controls in each band to taste.
The R
ATIO
control sets the compression ratio at the threshold of compres-
sion. To achieve a classic soft knee characteristic, set the R
ATIO
to 1:1 and
adjust the softness of the knee with the K
NEE
control.