Orban OPTIMOD 8685, Operating Manual

Page: 247 / 357

OPTIMOD SURROUND PROCESSOR TROUBLESHOOTING
5-3
•
If the Loudness Controller is active but, based on its gain reduction meter, you do
not believe it is working hard enough, set its threshold lower using the
L
OUDNESS
C
ONTROLLER
T
HRESH
control.
Note that the Loudness Controller controls subjective loudness to an ab-
solute threshold and does not understand the context of the program.
Therefore, if a commercial follows a piece of very quiet program mate-
rial, the commercial may still seem loud even though the Loudness Con-
troller is working properly.
See Loudness Control on page 3-14.
LFE channel is unbalanced with respect to the rest of the audio spectrum
•
Adjust the LFE C
OMPRESSION
T
HRESHOLD
control.
•
Adjust the B1>LFE C
OUPLING
control.
•
Adjust the LC B
ASS
C
OUPLING
control.
Dialog is buried by music and/or effects
•
In the surround processing, set the B
X
M
AIN
>C
ENTER
M
AX
–D
ELTA
GR controls to a
higher value. This will allow the center channel compressor to have more gain
with respect to the other channels.
Dialog is muffled
•
Use the five-band structure and set the
B3>B4 C
OUPLING
and
B4>B5
COUPLING
controls to a higher value. This will allow the processing to apply more dynamic
high frequency boost. In the surround processing, adjust these controls in the
center channel compressor.
•
Set the B4 C
OMPRESSOR
T
HRESHOLD
control to a higher value (i.e., closer to 0 dB).
This will produce less gain reduction in the presence region.
•
Try using the 8685’s HF Enhancer. To do so, L
OCATE
to the E
QUALIZER
screen and
set the
HF E
NHANCE
control to taste. For most TV programming, very low settings
(like 0.25) are appropriate because they minimize the possibility of increasing
noise.
Shrill, harsh sound
•
This problem can be caused by excessive HF boost in the HF Equalizer and HF En-
hancer. It could also be caused by an excessively high setting of the band 4 or
band 5 compression threshold control (if you are using the Five-Band Structure),
or by excessively high settings of the
B
AND
4 M
IX
and B
AND
5 M
IX
controls (located
in Full and Advanced Modify).
Dull sound
•
If you are using the Two-Band structure, dull-sounding source material will
sound dull on the air. The Five-Band Structure will automatically re-equalize such
dull-sounding program material to make its spectral balance more consistent
with other program material.