Earphones; Headphones; Loudspeakers; Microphones; Radios; Subwoofers; Acoustic conduits; Audio-receivers and video-receivers; Audio mixers; Cabinets for loudspeakers; Computer hardware; Data processing equipment, namely, couplers; Ear pads for headphones; Electrical pickups for use with musical instruments; Equalizers being audio apparatus; Horns for loudspeakers; Portable media players; Portable radios; Recording and playing devices for sound and image carriers; Semiconductor devices; Sonar ...