Matches in DBpedia 2015-10 for { ?s ?p "Stereo-4, also known as EV (from Electro-Voice) or EV-4, was a matrix 4-channel quadraphonic sound system developed in 1970 by Leonard Feldman and Jon Fixler.The system was heavily promoted by RadioShack stores in the USA, and there were quite a few companies that released albums encoded in this format. It is said it was the first commercial quadraphonic matrix system in the market."@en }
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- Stereo-4 comment "Stereo-4, also known as EV (from Electro-Voice) or EV-4, was a matrix 4-channel quadraphonic sound system developed in 1970 by Leonard Feldman and Jon Fixler.The system was heavily promoted by RadioShack stores in the USA, and there were quite a few companies that released albums encoded in this format. It is said it was the first commercial quadraphonic matrix system in the market.".