Subwoofers; Acoustic couplers; Audio-receivers and video-receivers; Cabinets for loudspeakers; Downloadable DVR sideloading software application for downloading DVR-recorded content for viewing on smartphones; Downloadable music files; Electric and electronic effects units for musical instruments; Electronic advertisement and messaging display unit with multi-networking (TCP/IP) capabilities and remote connectivity; Electronic switchers for audio and video signals; Equalisers being audio apparatus; Guitar amplifiers; Horns for loudspeakers; Laptop computers; Portable media players; Sound transmitting apparatus; Wireless speakers; Digital media streaming devices; Downloadable computer software for controlling the operation of audio and video devices