Apparatus and instruments for recording, transmission, reproduction, receiving, downloading, storage and/or editing of sound or images, namely, personal stereos; stereo amplifiers; stereo receivers, stereo tuners; audio and video receivers; television receivers; optical disc players and recorders; audio and video cassette players and recorders; portable digital music players; record players; car stereos; audio speakers; audio and video boards; hard disk players and recorders; video projectors; video projector screens; video display apparatus; loudspeakers; cabinets for loudspeakers; headphones; horns for loudspeakers; speaker systems; digital audio and video signal processors; digital audio and video network receivers; digital audio and video network servers; computers; personal digital assistants - PDA; hard disk drives; computer software for recording, transmission, reproduction, receiving, downloading, storage and/or editing of sound or images; storage media having computer software recorded thereon; blank memory carriers for recording; blank memory devices in the form of cards, discs or tapes; computer software recorded carriers; cables for use with audio and video apparatus and computers; racks for use with audio and video apparatus and computers; cabinets for use with audio and video apparatus and computers; speaker mounting brackets; speaker mounting stands; remote controllers and remote control apparatus; electric power supply for use with audio and video apparatus and computers