Gramophone PA PA system Victrola audio sound system audiophile backing ball cartridge bibliofilm binaural system bipack bitch box black-and-white film blank cartridge bullhorn cartouche cassette ceramic pickup changer color film color negative film crystal pickup derived four-channel system disc discrete four-channel system dope dry plate electrical transcription emulsion film four-channel stereo system frame hi-fi hi-fi fan high-fidelity intercom intercommunication system jukebox magnetic pickup microfilm monaural system mono monochromatic film motion-picture film needle negative nickelodeon orthochromatic film pack panchromatic film phonograph phonograph record photoelectric pickup photographic paper pickup plate printing paper public-address system quadraphonic sound system radio-phonograph combination record record changer record player recording roll shell sound film sound reproduction system sound track sound truck sound-on-film soundstripe squawk box stereo stylus system tape tape cartridge tape cassette tape deck tape recorder tape recording tone arm transcription transcription turntable tripack turntable vehicle wax wire recording