Apparatus for storing, recording, transmitting and reproducing sound and/or images, cabinets for loudspeakers; horns for loudspeakers; loudspeakers; radios; headphones; DVD players; vehicle radios; computer peripheral devices; acoustic couplers; record players; personal stereos; acoustic conduits; audio and video receivers; video telephones; microphones; amplifiers; amusement apparatus adapted for use with an external display screen or monitor; tape recorders; radiotelegraphy sets; cassette players