Differing significantly from the discrete 5.1 surround-sound formats, Logic 7 is a matrix-surround format with full-bandwidth channels. Logic 7 uses a proprietary decoder to combine data from a discrete five-channel digital mix into two channels, thus Logic 7 is known as a 5-2-5 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 7-encoded material can be played through conventional two-channel systems, as well as ProLogic- and Dolby Surround-encoded systems, although the encoded material will sound best when replayed through a Logic 7 decoder.