5.1 surround sound

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(Pronounced “five-point-one”) (n.)The digital audio multichannel format used to encode digital soundtracks for film, DVD, and HDTV. It refers to five discrete, full bandwidth (20-20 kHz) channels. These five are left front, right front, center front, left surround, and right surround. The “.1” usually refers to a limited bandwidth (20–120 Hz) subwoofer channel, but it may also refer to a special effects channel. The term is used by Dolby Digital and also by DTS Zeta Digital to describe the home version of their Coherent Acoustics system for theaters.