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I see a lot of people getting confused between Dolby Pro Logic, Dolby Surround, and Dolby 5.1 Dolby Pro Logic is the way it decides to send audio to the rear speakers, depending on what it has coming in the mains. Dolby Surround is a "sound format", that is truly only 2 channel, but is designed to be split and sent to the rears, similar to PL. Dolby 5.1 is the only "true" surround sound out of the group, because the format is actually carrying 6 individual channels of sound. 5 speakers and 1 subwoofer. because the subwoofer isnt full range, thats why they call it .1
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