Audio and infrasonic transducers; planar magnetic transducers; loudspeakers; audio speakers; tweeters; ribbon tweeters; woofers; subwoofers; apparatus for transmission of sound; amplifiers; loudspeakers with built-in amplifiers; telecommunication drivers being parts of telecommunication equipment; audio headphone drivers being parts of headphones; compression drivers being parts of audio equipment; headphones; earphones; portable audio systems comprised of transducers, speakers, tweeters, woofers, subwoofers, apparatus for transmission of sound or amplifiers; wireless audio systems comprised of transducers, speakers, tweeters, woofers, subwoofers, apparatus for transmission of sound or amplifiers; wireless audio system, namely, apparatus for wireless transmission of acoustic information; wireless audio speakers; audio speakers for computers; sound bars; wireless loudspeakers; wireless audio equipment, namely, stereos, speakers, amplifiers, equalizers, crossovers and speaker housings; public address (pa) systems and instruments; line array systems composed of loudspeakers, amplifiers and audio drivers; sound systems composed of remote controls, amplifiers, loudspeakers and components therefor; cabinets for audio equipment and loudspeakers; distribution system consisting of acoustic waveguides; horns for loudspeakers; electro-mechanical actuators; acoustic couplers; acoustic lenses for loudspeaker horns; loudspeaker modules comprised of acoustic enclosures for projecting sound, audio waveguides, loudspeakers, and electronic cables and connectors for use in audio systems that consist of loudspeakers, tweeters, woofers, subwoofers, or apparatus for transmission of sound