This page is devoted to the various "quad" systems that were developed in the 1970s. Consumer quadraphonic recordings were released on three primary formats - vinyl records, 8-track tapes, and reel-to-reel tapes. There was also some attempt to develop quadraphonic fm broadcasts, and some audio equipment companies released receivers and tuners that were "quad-ready", but quadraphonic radio never really happened.
Here is a page with tons of information on quadraphonic systems.
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Last Updated 27 January 2008