5-2
TROUBLESHOOTING ORBAN MODEL 8685
• Once D
IALNORM is correct, be sure that your active preset is causing the 8685’s
L
OUDNESS GAIN REDUCTION meter to indicate approximately 3 dB of gain reduction
on normal dialog. Adjust its MB
LIMIT DRIVE control if it does not. When the loud-
ness controller is operating normally, the 8685’s L
OUDNESS LEVEL meter should be
peaking around 0 dB on dialog. If it is not and you are using a custom preset,
you might get better loudness control by slightly tweaking the L
OUDNESS
THRESHOLD control to make the LOUDNESS LEVEL meter peak around 0, bearing in
mind that the correct setting is –10 dB for typical sound-for-picture processing. A
maximum variation of ±1 dB will typically suffice.
If the 8685’s active DIALNORM setting is not the same as the DIALNORM set-
ting you are transmitting to your audience, the 8685’s Loudness Level
meter will be calibrated incorrectly, so even if the meter is peaking at 0
dB, loudness at the consumer’s receiver will not be correct.
Note that because the 8685’s Loudness Level meter shares the loudness
controller’s filterbank, the meter does not show the effect of the
L
OUDNESS ATTACK control, which shapes the loudness controller’s gain re-
duction signal outside the loudness controller’s feedback loop. Therefore,
if you are using values of L
OUDNESS ATTACK below about 50%, the loud-
ness of transient events may be significantly higher than the Loudness
Level meter indicates.
Loudness Controller reduces transient punch of programming
• Reduce the amount of fast gain reduction in the loudness controller by setting
the L
OUDNESS ATTACK control closer to 0 %. This will allow more short loudness
peaks to pass through without attenuation by the loudness controller. We be-
lieve that the range from 50% to 70% offers the most useful tradeoffs between
reducing punch and allowing irritating short-term loudness bursts to pass
through uncontrolled.
Transient loudness events (like esses in speech) sound obtrusively loud
• Set the LOUDNESS ATTACK control closer to 100%. This will allow the loudness
controller to do more de-essing but may decrease transient impact as a side ef-
fect.
• Set the T
RANSIENT ENHANCE control to 0 ms.
• If “ess” sounds in speech (particularly with women’s voices) seem too pro-
nounced, one solution is to use the five-band structure and tune it for de-essing
(which we have done already in the TVxxx preets). Set the S
PEECH B5 THRESHOLD
control (for 2.0 processing) or C
ENTER B5 THRESHOLD control more negative. For
surround processing, make sure that the B5
MAIN>CENTER MAX +DELTA GR is set to
10 dB or more. This will allow the center band 5 compressor to produce as much
extra gain reduction as needed to control “esses.”
Commercials too loud in sound for picture applications
• Make sure that the Loudness Controller is activated on the preset that you are
using—the L
OUDNESS CONTROLLER THRESH control must not be set OFF (see page
3-52) and is normally set to –10 dB.
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