Acoustic apparatus for reproducing sound; analogue sound modifiers; apparatus for amplifying sound; apparatus for carrying sound; apparatus for reproduction of sound; apparatus for sound reproduction; apparatus for sound transmission; apparatus for the amplification of sound or images; apparatus for the reproduction of sound; apparatus for the reproduction of sound or images; apparatus for the transmission of sound; apparatus for the transmission of sound or images; instruments for the reproduction of sound; instruments for the transmission of sound; pick-ups for sound amplification; portable sound reproducing apparatus; sound amplifiers; sound amplifying apparatus; sound carriers; sound consoles; sound generation apparatus; sound players; sound receiving head sets; sound reproducing apparatus; sound reproducing apparatus for use in automobiles; sound reproducing apparatus for use in cars; sound reproducing instruments; sound reproduction apparatus; sound transmitting apparatus; stereophonic sound units