quadraphonic
adjective (UK also quadrophonic) uk/ˌkwɒd.rəˈfɒn.ɪk/ us/ˌkwɑː.drəˈfɑː.nɪk/
（电子录放、接收装置）四声道的
(of an electronic system of recording, playing, or receiving sound) having sound coming from four different directions
Compare: mono noun (SOUND)stereo noun