Quadraphonic open reel tape
Discrete 4-channel quadraphonic sound system / From Wikipedia, the free encyclopedia
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Quadraphonic open reel tape or Q4 was the first consumer format for quadraphonic sound recording and playback. Pre-recorded tapes in this format were introduced in the United States by the Vanguard Recording Society in June 1969.[1] Specialized machines to play these tapes were introduced by electronics manufacturers such as TEAC Corporation at about the same time.