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• a  of or relating to quadraphony
  his quadraphonic sound system

• The widely heralded quadraphonic sound, which feeds four channels through separate speakers, is now a commercial reality, both in terms of recording techniques and home playing .
• But he probably couldn't persuade a Boy Scout troop to make a right turn, even if you gave him quadraphonic sound.
• Sales peaked in 1974; in 1977, after a dispute with banks, the company was placed in bankruptcy and Earth Shoes went the way of quadraphonic Helen Reddy albums -- though the former .

• quadriphonic
• quadrasonic
• quadrisonic