Lexicon RV-8 - Manual (Page 160)

Mode Adjust Lexicon
6-18
THX, THX UL2Cin & THX SurEX
These modes are designed for 7-channel playback of 5.1-channel Dolby
Digital film sources that do not have THX Surround EX encoding. They
apply THX re-equalization to simulate high-frequency rolloffs that occur
in movie theaters. Most films are mixed for movie theaters, and might
sound too bright when played back in home theaters without re-equal-
ization. THX timbre matching is applied to minimize timbre differences
between the front and surround channels, which results in smoother
sound movements between them. These modes are recommended for
home theaters with THX-certified speakers.
The listening mode name differs, depending on the encoding present
in the input source, the SURROUND EX parameter setting and the
speaker setup.
The table at the bottom of the page shows the conditions for the
behavior of the THX Ultra2 and THX Surround EX modes when
activated:
• The THX UL2Cin listening mode is available when both the side
and rear speakers are present and THX ULTRA2 decoding is
engaged. THX Ultra2 decoding is engaged when the SURROUND
EX parameter is set to OFF or AUTO and a non-flagged
5.1-channel Dolby Digital source with or without THX Surround
EX encoding is detected.
• The THX SurEX listening mode is available when both the side and
rear speakers are present and THX Surround EX decoding is
engaged. THX Surround EX decoding is engaged when the
SURROUND EX parameter is set to ON or AUTO and a flagged
5.1-channel Dolby Digital source with THX Surround EX encoding
is detected.
• The THX listening mode is available when both Ultra2 and THX
Surround EX decoding are deactivated.
Note:
Some EX-encoded sources are not flagged, and require manually
setting the SURROUND EX parameter to ON for EX decoding.
When THX Ultra2 decoding is active:
• Adaptive de-correlation is applied to increase the perceived
width of the listening space. De-correlation of the mono
surround channel increases the perceived width of the surround
field in home theaters.
MODE ADJUST OR OR SurEX UL2Cin
Input Source
Parameter Setting 5.1-Channel Dolby Digital
5.1-Channel THX Surround EX
Dolby Digital (Flagged)
5.1-Channel THX Surround EX
Dolby Digital (Non-Flagged)
SURROUND EX: AUTO THX ULTRA2 THX SurEX THX ULTRA2
SURROUND EX: ON THX SurEX THX SurEX THX SurEX
SURROUND EX: OFF THX ULTRA2 THX ULTRA2 THX ULTRA2