Apparatus and instruments for transmitting, receiving, recording, streaming or reproducing sound or images; audio-visual and multimedia apparatus; audio-visual processors; loudspeakers; passive loudspeakers; active loudspeakers; subwoofers; electric cables; electric connections; headphones; earphones; earbuds; media content; media players; amplifiers; tuners; cassette players; compact disc players and readers; televisions; digital video disc players, MP3 players and MP4 players; hi-fi equipment; record player turntables; record players; mixing consoles; audio mixers; sound mixers; video mixers; digital to analogue converters; loudspeaker enclosures; loudspeaker stands; loudspeakers and loudspeaker enclosures for professional users; microphones; audio-visual streaming devices; digital streamers; lighting control apparatus; all-in-one music players; home cinema audio systems; application software for apparatus and instruments for transmitting, receiving, recording, streaming or reproducing sound or images; parts and fittings for all the aforesaid goods.