Gramophone PA PA system Victrola articulate audible audio sound system audiophile binaural system bitch box bullhorn cartridge ceramic pickup changer clear contrastive crystal pickup definite derived four-channel system discrete four-channel system distinct distinctive four-channel stereo system hearable hi-fi fan high-fidelity intercom intercommunication system jukebox magnetic pickup monaural system mono needle nickelodeon phonograph photoelectric pickup pickup plain 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