Amplifiers; Audio-receivers and video-receivers; Audio equalizer apparatus; Audio interfaces; Audio mixers; Audio speakers for automobiles; Cabinets for loudspeakers; Compact disc players; Electric cables and wires; Headphones; Horns for loudspeakers; Loudspeakers; Megaphones; Microphones; MP3 players; Personal stereos; Picture projectors; Portable media players; Sound recording apparatus; Sound reproduction apparatus; Sound transmitting apparatus; Telephone headsets