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Amplifiers; loudspeakers; radios; audio receivers; radio receivers; speaker enclosures; stereo receivers; electronic controllers for audio systems; electric line-out converters; interfaces for audio systems; illuminated speaker rings being component parts and fittings of audio speakers; power wire being electrical wire; electric speaker wire; speaker grilles being component parts and fittings of audio speakers; electrical signal cables; passive radiators being speaker enclosures; remote controls for sound systems; audio cables; equalizers being audio apparatus; sound crossovers; loudspeaker kits comprising loudspeakers, amplifier, audio receiver, speaker enclosure, mounting bracket adapted for audio speakers, radio antenna, electric wiring harness for vehicles, and signal wire being cables for electrical or optical signal transmission; headphones; earbuds