Note, however, that encoders and decoders support numerous channel combinations, and stereo, four-channel, and four-channel+LFE soundtracks have been released commercially on DVD, CD, and Laserdisc. The basic and most common version of the format is a 5.1-channel system, similar to a Dolby Digital setup, which encodes the audio as five primary (full-range) channels plus a special LFE (low-frequency effects) channel for the subwoofer. Work on the format started in 1991, four years after Dolby Labs started work on its new codec, Dolby Digital. It was known as The Digital Experience until 1995. (NASDAQ: DTSI, formerly known as Digital Theater Systems, Inc.), an American company specializing in digital surround sound formats used for both commercial/theatrical and consumer grade applications. DTS is a series of multichannel audio technologies owned by DTS, Inc.
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