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Computer peripheral devices; guitar amplifiers; portable wireless speakers; acoustic membranes; car stereos; automotive audio speaker; megaphones; audio speaker housings for vehicles; sound transmitting apparatus; audio mixers; surround audio speaker; digital sound processors; microphones; audio equaliser apparatus; audio amplifiers; subwoofer; signal processors for loudspeakers; loudspeakers; horns for loudspeakers; cabinets for loudspeakers; acoustic couplers; audio transmitters being radio transmitters; portable media players; subwoofers; audiovisual teaching apparatus, namely, audio speakers; amplifiers