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5.1

Shorthand notation for a movie that has five full-range channels of sound and one channel of subwoofer effects. The number to the left of the dot is the number of full range channels and the number to the right of the dot signifies the presence of the dedicated subwoofer channel (also known as LFE.) A movie in 5.0 sound has five full range channels and no subwoofer track; a movie in 2.0 sound can be encoded in Dolby Surround or can just be stereo.

7.1

Shorthand notation for a movie that has seven full-range channels of sound and one channel of subwoofer effects. The number to the left of the dot is the number of full range channels and the number to the right of the dot signifies the presence of the dedicated subwoofer channel (also known as LFE.)