It is the common name for an eight-channel surround audio system used in home theater configurations. A multichannel sound technology that features 7 channels of sound in the left, right, center, left surround, right surround, left rear, right rear positions. 7.1 systems also have 1 channel for LFE (low-frequency effects) which is usually sent to a subwoofer. With miniDSP's products you can perfect this system with room acoustic measurements (UMIK-1), or optimizing your bass management (2x4 HD) and even perfect your sound with our room correction product line: Dirac Series (DDRC-88A), nanoAVR HD/HDA/DL products and the 10x10 HD.
(Source: wikipedia.org)