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Quadraphonic audio was one of the earliest consumer offerings in surround sound. It was a commercial failure due to many technical problems, which were solved too late to save the technology from disaster. The format was more expensive than standard two-channel stereo. — “Quadraphonic sound - Wikipedia, the free encyclopedia”, en.wikipedia.org
After the failure of quadraphonic audio in the 1970s, multichannel music has slowly been fully discrete and rotating quadraphonic sounds generated with industrial electronic. — “Surround sound - Wikipedia, the free encyclopedia”, en.wikipedia.org
Who was buying quadraphonic equipment, and why weren't the rest of the populace? The first is Quadraphonic sound#Discrete formats, where the systems that use a needle state how the extra channels are super. — “Talk:Quadraphonic sound - Wikipedia, the free encyclopedia”, en.wikipedia.org