Lexicon Digital Controller MC-12 - Manual (Page 144)

Mode Adjust Lexicon
5-18
, UL2Cin & SurEX
These modes are designed for 7-channel playback of 5.1-channel
Dolby Digital film sources that do not have THX Surround EX
e n c o d i n g . T h e y a p p l y T H X r e -e q u a l i z a t i o n t o s i m u l a t e
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-equalization. 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 ULTRA2 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