Gramophone PA PA system Victrola audio sound system audiophile binaural system bitch box bullhorn cartridge ceramic pickup changer cinema cinematograph crystal pickup derived four-channel system discrete four-channel system drive-in four-channel stereo system hi-fi hi-fi fan high-fidelity intercom intercommunication system jukebox kinematograph magnetic pickup monaural system mono movie theater moving-picture theater needle phonograph photoelectric pickup pickup picture house picture palace public-address system quadraphonic sound system radio-phonograph combination record changer record player sound reproduction system sound truck squawk box stereo stylus system tape deck tape recorder tone arm transcription turntable turntable