Ambisonics
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Ambisonics is a full-sphere surround sound format: in addition to the horizontal plane, it covers sound sources above and below the listener.
The array designed and made by Dr Jonathan Halliday of Nimbus Records
Quadraphonic sound
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Quadraphonic sound – equivalent to what is now called 4.0 surround sound – uses four audio channels in which speakers are positioned at the four corners of a listening space. The system allows for the reproduction of sound signals that are independent of one another.
Sansui QS sound decoder
An RCA Quadradisc record
A four-channel reel-to-reel tape unit from the 1970s, one of the few ways to achieve discrete four-channel sound at home
Ambisonic mixing equipment