monaural system (?.)

• Gramophone
• PA
• PA system
• Victrola
• audio sound system
• audiophile
• binaural system
• bitch box
• bullhorn
• cartridge
• ceramic pickup
• changer
• crystal pickup
• derived four-channel system
• discrete four-channel system
• four-channel stereo system
• hi-fi
• hi-fi fan
• high-fidelity
• intercom
• intercommunication system
• jukebox
• magnetic pickup
• mono
• needle
• nickelodeon
• phonograph
• photoelectric pickup
• pickup
• 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