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DC-1 Theory
and Design
Lexicon
5.1 Logic 7 combines the re-equalization, subwoofer crossover, and adap-
tive de-correlation features of 5.1 THX Cinema with Lexicon's Logic 7
matrix technology. 5.1 Logic 7 differentiates between the side and rear
speakers with a combination of delay and directional steering. For
soundtracks with music or effects such as wind noise or applause, this
creates a more spacious and enveloping soundfield and has a large effective
listening area. For sound effects that pan to the side and rear of the listener,
the result moves more convincingly through the sides and into the rear
speakers. 5.1 Logic 7 produces the most exciting, and at the same time the
most natural reproduction of 5.1 channel encoded material.
5.1 Logic 7 includes a parameter for surround level which has a default
setting of +3dB. As of this writing, extensive listening to available 5.1 laser
discs has convinced us that they sound better balanced (and closer to their
2-channel versions) with a surround boost of 3dB.
5.1 Two Channel provides a means for mixing the 5.1 channels of an AC-3
film into two stereo channels while preserving all the original directional
effects when the mix is decoded through Logic 7 or TV Matrix. 5.1 Two
Channel includes a parameter for surround level. Like the surround level
parameter in Logic 7, the optimum setting in our experience is +3dB. The
default setting is 0dB. There is also a parameter for reducing the level of the
LFE channel.
Lexicon 5.1 Enhancements
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