JBL AV1 - Manual (Page 134)

Mode Adjust
JBL Performance
5-36
SURR ROLLOFF 500Hz to 20.0kHz, OFF
Applies high-frequency attenuation control to the audio output
connectors labeled Side L/R and Rear L/R. This filter is only applied
to output signals generated by the AV1.
SURROUND DLY 0ms to 15ms
Increases the perceived depth of the listening space by delaying the
arrival time of signals from the side and rear speakers. It is recom-
mended that you increase the setting when a greater sense of
depth is desired in the listening space.
SURROUND EX AUTO, ON, OFF
Controls the THX Surround EX decoding feature, which can be
used to extract a rear channel from 5.1-channel Dolby Digital
sources.
• When set to ON, THX Surround EX decoding is engaged for
all 5.1-channel Dolby Digital sources.
• When set to OFF, THX Surround EX decoding is not engaged
for all 5.1-channel Dolby Digital sources.
• When set to AUTO, THX Surround EX decoding is engaged
when a flagged 5.1-channel Dolby Digital source with THX
Surround EX encoding is detected. THX Surround EX decod-
ing is not engaged when a non-flagged 5.1-channel Dolby
Digital source with or without THX Surround EX encoding is
detected.
• The AV1 cannot automatically detect THX Surround EX
encoding in non-flagged 5.1-channel Dolby Digital sources. A
non-flagged source does not include information in the input
signal that identifies THX Surround EX encoding.
The THX SurEX listening mode is available when THX Surround EX
decoding is engaged. The THX and THX ULTRA2 listening modes
are available when THX Surround EX decoding is not engaged.
THX Surround EX decoding cannot be engaged unless both side
and rear speakers are present. See “Speaker Setup” on page 3-24
for more information.
When the Shift command bank is activated, pressing the remote con-
trol THX button while a 5.1-channel Dolby Digital input source is
present activates the THX, THX ULTRA2 or THX SurEX listening mode.
Note:
Toggling the SURROUND EX parameter setting produces low-
level clicks in the front speakers.
SURROUND MIX -5dB to +5dB
Controls the relative level of surround channel information sent to
the audio output connectors labeled Front L/R. It is recommended
that you set this parameter to +2dB or +3dB for all input sources.
VOCAL ENHANCE +6.0dB, +3.0dB, +0.0dB
Controls the level of dialog boost in the audio output connector
labeled Center. Increase this setting to improve dialog intelligibility,
particularly at lower volume levels.