Headphone amplifiers; Headphone consoles; Headphone-microphone combinations; Headphones; Headphones for audio apparatus; Headphones for microphones; Plug adaptors for headphones; Stereo headphones; Stereo headphones for personal entertainment use; Stereophonic apparatus incorporating headphones for personal use; Stereophonic headphones; Audio speakers; Audio speakers for automobiles; Audio speakers for home; Car speaker components; Car speakers; Personal stereo speaker apparatus; Public address speaker systems; Signal processors for audio speakers; Speaker switches; Speakers (audio equipment); Speakers for compact disc players; Speakers for computers; Speakers for record players; Cassette tape recorders for audio systems; Audio cable; Audio cable connectors; Audio cassette players; Audio equipment; Audio players; Car audio apparatus; Car audio instruments