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Pro Logic 7 : Differing significantly from the discrete 5.1 surroundsound formats, Logic 7 is a matrixsurround format with fullbandwidth channels. Logic 7 uses a proprietary decoder to combine data from a discrete fivechannel digital mix into two channels, thus Logic 7 is known as a 525 matrix. Additionally, the matrix can decode to seven channels instead of five, in which case the matrix creates two side loudspeaker channels, moving the rear channels completely to the rear. Logic 7encoded material can be played through conventional twochannel systems, as well as ProLogic and Dolby Surroundencoded systems, although the encoded material will sound best when replayed through a Logic 7 decoder.


