Quadraphonic Formats

Quadraphonic formatsQuadraphonic was an early attempt at surround sound using four speakers in the very late 1960s and 1970s. Thousands of recordings were made in quadraphonic, but it was not a commercial success, partly due to the number of competing formats.

Quadraphonic open reel tape (Q4) (1969 – mid 1970s)

Quadraphonic 8-Track (Q8) (1970 – 1978)

EV Stereo-4 (1970 – 1975)

SQ Quadraphonic (1971 – 1979)

Quadraphonic Sound (QS) (1972 – 1978)

CD-4 (Compatible Discrete 4) / Quadradisc (1972 – 1979)