Lexicon Part #070-13234 사용자 설명서

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AC-3 Effects and Parameters
SURROUND EX (available as of software version 4) extracts and repro-
duces the additional rear channel mixed into SURROUND EX encoded
soundtracks. This parameter is automatically set to ON when both SIDE
and  REAR speakers are  selected in  the SPEAKER CONFIGURATION
menu, and will not operate unless SIDE and REAR speakers are selected.
SURROUND EX decoding can be engaged during playback of non-SUR-
ROUND EX encoded 5.1 material, however, the information delivered to
the rear channels may not be pleasing.
SURROUND MIX allows independent adjustment of the level of the sur-
round channels. Many  AC-3  encoded soundtracks sound  better when
down-mixed to two channels with the surround level increased by approxi-
mately 2-3dB.
VOCAL ENHANCE boosts dialog in the  center channel. By targeting
specific frequencies, it can boost only dialog, without raising the entire
center channel level (which would alter the output balance achieved during
calibration).