Apparatus for recording, transmission or reproduction of sound, images and data; magnetic data media; phonograph records; compact discs; dvds; digital recording media; recorded and re-recordable data carriers, in particular optical and magnetic storage media; computer software; mobile apps; musical sound recordings; downloadable musical sound recordings; digital music [downloadable] provided from a computer database or the internet; electric cables and wires; electric conductor bars; electrical cabling; electronic cables; insulated electrical cables; cables for optical signal transmission; cables for electrical signal transmission; audio cables; audio cable testers; audio expanders; audio noise reducers; high fidelity audio apparatus; equalizers [audio apparatus]; wearable audio equipment; audio electronic apparatus; audio mixers; car audio apparatus; parts and fittings for audio apparatus; signal cables for it, av and telecommunication; routers for routing audio, video, and digital signals; information technology and audio-visual, multimedia and photographic devices; electronic units for transmitting audio signals; audio dynamic characteristic modifiers; electric terminal lugs; heat resistant electric wires; male connectors for electrical cables; electric cables for the transmission of sounds and images; electrical cables in assembled and non-assembled form; parts of assembled cables, namely, hi-fi cables, speaker cables, low frequency audio cables, digital audio and video cables; digital cables; antenna cables; digital audio / video transmission interface cables, namely, electric cables for the transmission of sound and images; display ports [electronic connectors]; scart leads; light cables; high frequency cables; electrical cable connectors; cable connectors; cable lugs; ring terminal ends; rca connectors; ducts and cable ducts for electrical and light installation; point-of-sale [POS] terminals; subfrequency and shock absorbers, namely, frequency stabilizers and surface wave filters; measuring devices for optimizing the basic electrical quantities; car hi-fi accessories, namely, car speaker cables and cinch cables in assembled and non-assembled form for signal currents, battery and ground cables, y-cinch adapters; fuses; fuse holders; fuse blocks for multiple cable protection; cable distribution blocks; battery terminals; cable plugs, lugs and ring terminal ends; audio crossovers; speakers for car hi-fi systems; headphones; loudspeakers; audio mixing consoles; microphones; sound transducers for installation in walls and furniture of all kinds; devices for controlling light; digital music [downloadable] provided from the internet