Wireless receivers and headsets; wireless transmitters; record players; record player turntables; phono cartridges for record players; record stabilizers for use with record player turntables; phono equalizers; pick-up arms for record players; tone arms for record players; headshells for phono cartridges; microphones; microphones for mobile phones; apparatus for recording, transmission and reproduction of sound and images; earphones; amplifiers, namely, audio amplifiers, sound amplifiers, stereo amplifiers, headphone amplifiers; audio and video receivers; audio headsets for use with mobile phones, computers, laptops, tablet computers, portable music players, portable radios, stationary music players, vehicle sound systems, televisions, set-top boxes, digital video recorders, cable television boxes, video monitors, communication radios, intercom systems, audio tour systems and streamed internet audio; audio mixers; electro-acoustic transducers; hands-free kits for mobile phones; mobile phone straps; loudspeakers; speakers for mobile phones; earphone cables; headphone cables; telecommunication machines and apparatus, namely, wireless transmitters and receivers and their parts and fittings, wired telecommunications transmitters and receivers and their parts and fittings and optical wireless communication transmitters and receivers; computer software to control and monitor the function of audio equipment; computer software for digital signal processing; audio signal processing software; computer software for digital feedback reduction; network interface systems, namely, interface modules, software for monitoring and control of wireless receivers and cables for wireless audio systems; computer hardware and software systems for teleconferencing and video conferencing