Quadraphonic (or quadrophonic) sound – the most-widely-used early term for what is now called 4.0 stereo – uses four channels in which speakers are positioned at the four corners of the listening space, reproducing signals that are (wholly or in part) independent of one another. Quadraphonic audio was one of the earliest consumer offerings in surround sound. It was a commercial failure due to many technical problems, which were solved too late to save the technology from disaster. The format was more expensive than standard two-channel stereo. It also required extra speakers, and suffered from lack of a standard format for LP records. The rise of home theatre products in the late 1980s and early 1990s brought multi-channel recording formats back to the forefront, although in a completely different form. Quite a few quadraphonic recordings were made before its demise, and some of these recordings were later reissued on CD in Dolby Surround.

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