Orban OPTIMOD-FM 5700i, Руководство по эксплуатации

Страница: 202 / 335

3-38
OPERATION ORBAN MODEL 5700i
cause the Five-Band structure uses phase-rotating crossovers in the five-
band compressor / limiter, there is little or nothing to be gained by using
a phase-linear crossover in the Five-Band structure’s AGC.
L
I
N
O
D
LY
(Linear-Phase; no delay) is a phase-linear crossover whose upper band is de-
rived by subtracting its lower band from the crossover’s input. When the upper and
lower bands have the same gain, their sum is perfectly flat with no phase rotation.
However, when the upper and lower bands have different gains, peaks and dips ap-
pear in the frequency response close to the crossover frequency.
L
I
N
O
D
LY
is useful if you need a crossover with low delay and no phase
distortion when flat. Its downside is the possibility of coloration when
the gains of the two bands are widely disparate.
L
INEAR
is a phase-linear crossover whose upper band is derived by subtracting its
lower band from the crossover’s input, as passed through a delay equal to the group
delay of the lowpass crossover filter. The overall frequency response remains smooth
as the two bands take different degrees of gain reduction—the response is a smooth
shelf without extra peaks or dips around the crossover frequency. The two bands are
each down 6 dB at the crossover frequency. This crossover has constant delay even
when the two bands have unequal gains.
While L
INEAR
has the ideal combination of no phase distortion (even
when non-flat) and smooth shelving behavior, it adds about 4 ms to the
overall delay (compared to
A
LLPASS
and
L
I
N
O
D
LY
), so it is not a good
choice if you need to drive talent headphones.
Peak Limiter Controls
The clipper controls are common to the Two-Band and Five-Band structures, except
as noted in the control descriptions on the following pages.
Bass Clip Mode sets the operation of the bass clipper to H
ARD
, LL H
ARD
, M
EDIUM
, or
S
OFT
.
•
H
ARD
operates the clipper like the clipper in the 8200. It produces the most har-
monic distortion.
This can be useful if you want maximum bass punch, because this setting
Clipper Controls
Full Modify Name Advanced Name Range
--- Overshoot Compensator
Drive
–2.0 … +2.0
BASS CLIP Bass Clip Threshold –6.0 … 0.00
Bass Clip Shape 0 … 10
FINAL CLIP Final Clip Drive –3.0 … +5.0
COMP DRV Composite Limiter Drive Off, 0 ... 3 dB
Speech Bass Clip –6.0 … 0.00
MPX LIMIT MODE MPX Limiter Mode Hard, HalfCos
Table 3-5: Clipper Controls