You could win a bar bet by knowing that Quadraphonic sound (surround-sound as we call it now) first became available in 1969. In 1970, RCA Records released Quad-8 tapes which were 8-Track tapes that played discrete quadraphonic sound. If you played them on a standard stereo 8-Track you would only get half the sound, so this lack of backward compatibility meant you had to buy a specific Quad-8 player. Again, expensive with not a lot of demand. Quad-8 tapes were available until 1978, but demand was never strong.

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