Audio equaliser apparatus; Apparatus for recording, transmission or reproduction of sound; Wireless transmitters and receivers; Audio transmitter units; Loudspeakers; Tweeters; Sub-woofers; 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; Loudspeaker systems; Horns for loudspeakers; Headphones; Electroacoustic transducers; Soundbar speakers; Amplifiers; loudspeakers with built in amplifiers; Acoustic couplers; Receivers for amplifying sound; Wireless distribution system comprising waveguides; Monitor signal amplifiers; audio speakers in the nature of music studio monitors; Diode arrays; public address systems; software drivers for recognizing loudspeaker angles and positions; computer peripheral devices; Time recording apparatus; Phototelegraphy apparatus; automatic measuring machines, namely, antenna parameter measuring apparatus; Micrometers; Electronic notice boards; Branch boxes, namely, electrical junction boxes; Electro-dynamic apparatus for the remote control of signals; Sound projectors and amplifiers; Electrical inductors; Optical apparatus and instruments, namely, optical mirrors, optical reflectors, optical lenses, reflectors, video screens, and video projectors; Electric wires and cables; Silicon wafers; Commutators; Electrolysis apparatus for electroplating purposes; X-ray apparatus, not for medical purposes; Anti-glare glasses; Electric buzzers; cabinets for loudspeakers; Battery boxes