Orban OPTIMOD-FM 8600S, Operating Manual

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3-78
OPERATION ORBAN MODEL 8600S
dependent. The
FM  HD
mode causes almost all HD controls to track the settings of
their FM counterparts. Only the controls in the
HD L
IMITING page are adjustable sepa-
rately. The
I
NDEPENDENT mode allows you to set the HD equalizer and HD multiband
compressor/limiter audio controls independently of their FM counterparts.
I
NDEPENDENT mode exposes HD controls that are hidden in
FM  HD
mode.
If a given preset has certain HD and FM controls set differently, setting the
FM  HD
C
ONTROL
C
OUPLING to
C
OUPLED will immediately cause the HD controls to take the
same settings as their FM analog counterparts.
On 8600S PC Remote, there are buttons available on the button bar to toggle the
FM  HD
mode. When the
FM  HD
mode is
I
NDEPENDENT , a button on the toolbar
toggles between corresponding FM and HD tabs (for example, between
C
OMPRESSORS and
HD C
OMPRESSORS ).
HD EQ Gain determines the depth of high frequency shelving equalization pro-
duced by the parametric HF shelving equalizer, which will be placed either before or
after the digital-channel look-ahead limiter (depending on the setting of the
HD HF
S
HELF
EQ
control in the
I
NPUT
/ O
UTPUT
HD D
IGITAL
R
ADIO screen).
When placed before the look-ahead limiter, this equalizer is sometimes
useful for reducing the audible disparity between the FM and digital-
channel outputs (although the
HD B
AND
M
IX
controls are probably more
appropriate for this task). The digital-channel output receives no high
frequency limiting or clipping and may therefore be as much as 6 dB
brighter than the FM output. If you wish to reduce this difference to
smooth out the audible difference between the two channels during a
receiver crossfade, you can apply HF rolloff to the digital-channel channel
by ear. Another reason you might want to do this is if the digital-channel
channel sounds excessively bright after you have optimized the 8600S’s
tuning for FM. Of course, you can also use the
HD MB B
AND
M
IX controls
for this purpose, or use these controls in conjunction with the HF shelving
equalizer.
Yet another reason to use HF rolloff in the digital-channel channel is to
reduce codec artifacts at the high frequencies—the familiar “watery”
sound.
When placed after the look-ahead limiter, the shelving EQ can reduce
the effects of codec overshoot.
The parametric HF shelving equalizer can only produce HF rolloff. It can-
not boost.
Function Control Name Values
HF Shelving Filter
HD EQ Gain 0…–6 dB; 0.5 dB steps
HD EQ Freq 2…– 20 kHz; 1/6-octave steps
Look-Ahead Limiter HD Limiter Drive 0…+12 dB; 1.0 dB steps
HD De-Esser HD De-Ess Off, –23.5…0
FM  HD Control Coupling
FM  HD Control
Coupling
FM  HD; Independent
Table 3-14: Unique HD Audio Controls (in HD Distortion page in PC Remote)