Phase 4 Stereo

Phase 4 Stereo was a recording process created by the U.K. Decca Records label in 1961. The process was used on U.K. Decca recordings and also those of its American subsidiary London Records during the 1960s.

Phase 4 Stereo recordings were created with an innovative 10-channel, and later 20-channel, "recording console".

Approximately two hundred albums were released with the process, including popular music, "gimmick" records engineered to make the sound travel from speaker to speaker, records featuring percussion effects, and historical sound effect records. In 1964, a light classical Phase 4 "Concert Series" was produced. The label was a major financial success for Decca.