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Quadraphonic sound
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===Derived (2β2β4) formats=== Derived (2β2β4) formats are simple and inexpensive electronic solutions that add or extract rear ''ambience'' or ''reverberation'' sound channels from stereo records i.e., studio reverb, audience applause, etc. There is no precise placement of individual instruments in the rear channels.<ref name="books.google.pt">{{Google books |id=PQEAAAAAMBAJ |page=86 |title=Popular Science |date=Nov 1971 }}</ref> *[[Dynaquad|DY / Dynaquad]] (1969) *[[Hafler circuit]] (1969) *ΡΠΈΡΡΠ΅ΠΌΡ ABC (Quadra ABC β briefly used only in the Soviet Union) (1981)
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