quad‧ra‧phon‧ic ,
quadrophonic /ˌkwɒdrəˈfɒnɪk◂ $ ˌkwɑːdrəˈfɑː-/
adjective using a system of sound recording, broadcasting etc in which sound comes from four different
speakers at the same time ⇒
mono,
stereo [TahlilGaran] Dictionary of Contemporary English ▲