Amplifiers; Amplifiers being audio apparatus; Amplifiers for use in cars for entertainment purposes; Amplifiers for use with gramophones; Amplifying apparatus; Amplifying tubes; Analogue converters; Analogue to digital data converters; Audio amplifiers; Audio and video receivers; Audio apparatus; Audio cable; Audio cable connectors; Audio cassette players; Audio digital discs; Audio digitisers; Audio equipment; Audio frequency apparatus; Audio players; Audio processing apparatus; Audio speakers; Circuit boards; Converters for analogue signals; Converters for digital signals; Digital amplifiers; Digital audio players; Digital audio signal processors; Digital data transmission apparatus; Headphone amplifiers; Headphones; Headphones for audio apparatus; Headphones for microphones; High fidelity audio apparatus; Horns for loudspeakers; Mobile phones; MP3 players; Optical fibre cables; Speakers (audio equipment); Stereophonic amplifiers; Stereos