Amplifiers; Earphones; Headphones; Megaphones; Acoustic conduits; Acoustic couplers; Acoustic membranes; Acoustic separation units; Cabinets for loudspeakers; Computer hardware and recorded computer software programs sold as a unit for the integration of text, audio, graphics, still images and moving pictures into an interactive delivery for multimedia applications; Horns for loudspeakers; Downloadable computer software for controlling the operation of audio and video devices; Downloadable co...