Apparatus for recording, transmission or reproduction of sound; loudspeakers and loudspeaker units; sound and video recording and reproducing apparatus; display monitors, sound processors and mixers, electrical control devices for audio systems including surround, Hi-fi and digital audio systems; remote controls for radios; apparatus and instruments for the reproduction of aural signals, namely, loudspeakers; high fidelity apparatus, sound recording apparatus for use in reproducing sound with little distortion; replacement parts and fittings therefor for all the aforesaid goods; accessories for the aforesaid goods, namely, multi-channel loudspeaker, loudspeakers, loudspeaker cabinets, sound recording and sound reproduction apparatus; cabinets specially adapted for multi-channel loudspeakers.;