5.1-, 6.1-, 7.1-Channels
A surround processor, or receiver, may produce 6, 7, or 8 channels of output, depending on the source and type of surround processing. The basic surround format (“5.1” surround) includes three full-range front channels (left, right and center), two full-range surround channels (left surround and right surround), and a low-frequency, or subwoofer channel. Because the subwoofer channel carries only the lowest octaves compared to the five full-range speakers, it is called the “.1” channel. A “6.1-channel setup” adds a separate full-range “center back” speaker to the 5.1 array. A “7.1”-channel system includes two “back” channels in addition to the surround channels.
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