Optimod-Surround 8685 V1.0 Operating Manual - Orban

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 LOUDNESS
CONTROLLER THRESH control.
Note that the Loudness Controller controls subjective loudness to an absolute
threshold and does not understand the context of the program.
Therefore, if a commercial follows a piece of very quiet program material,
the commercial may still seem loud even though the Loudness Controller
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 COMPRESSION THRESHOLD control.
• Adjust the B1>LFE COUPLING control.
• Adjust the LC BASS COUPLING control.
Dialog is buried by music and/or effects
• In the surround processing, set the BX MAIN>CENTER MAX –DELTA 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 COUPLING 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 COMPRESSOR THRESHOLD 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, LOCATE to the EQUALIZER screen and
set the HF ENHANCE 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 Enhancer.
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 BAND 4 MIX and BAND 5 MIX 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.