Audio equipment, namely, audio mixers, speakers, amplifiers, equalizers, crossovers and speaker housings; audio apparatus, namely, audio speakers and audio equalizer apparatus; audio electronic apparatus, namely, audio stereo systems comprised of personal stereos, stereo receivers, audio amplifiers and loudspeakers, audio mixers, electronic sound mixing, processing and synthesizing apparatus; audio processing apparatus, namely, audio signal processors, audio processing computers, audio processing stereos, audio processing converters, audio processing receivers and audio processing amplifiers; audio frequency apparatus, namely, audio frequency receivers, audio frequency amplifiers, audio frequency recorders, audio frequency transformers and audio frequency converters; frequency meters; optical frequency metrology devices; audio amplifiers; audio speaker enclosures; loudspeakers; loudspeaker systems; digital audio players; electronic audio/video signal distribution systems, namely, distribution amplifiers for audio and visual signals; portable sound reproducing apparatus; amplifiers; apparatus for the reproduction of sound; apparatus for recording sound; equalisers being audio apparatus; sound level meters; high fidelity apparatus, namely, loudspeakers and sub-woofers; high fidelity audio apparatus, namely, audio speakers; hi-fi sound systems comprising remote controls, amplifiers, loudspeakers and components therefor; testing and quality control devices, namely, computer-controlled apparatus for testing and measuring audio signals; calibrators, namely, calibration devices for calibrating audio equipment; calibrating apparatus, namely, calibration devices for calibrating loudspeakers and loudspeaker systems; amplifiers, namely, control amplifiers; automatic control apparatus for controlling sound levels; network controlling apparatus, namely, programmable electronic sound controllers for use in connection with loudspeakers; electronic control systems for loudspeakers; voice processing systems being digital voice signal processors; audio cables being loudspeaker cables; audio cables; coaxial cables; audio cables being communications cables; ethernet cables; audio cable connectors; audio interfaces; headphones; remote controls for loudspeakers; downloadable computer software for use in controlling sound levels of audio equipment; downloadable mobile application software for mobile phones, namely, software for use in controlling audio equalizers, loudspeakers and high fidelity apparatus; downloadable computer software and application for mobile devices for use in controlling and improving audio equipment sound quality; downloadable testing software, namely, calculation and calibration software used for calibrating and optimizing sound for headphones; computer programmes, recorded, for calibrating sound; downloadable computer programs for modeling head and upper torso features for the purpose of optimizing sound; computer software applications, downloadable, for modeling head and upper torso features for the purpose of optimizing sound; downloadable computer platform software for use in controlling and improving audio equipment sound quality; downloadable audio editing software; downloadable computer software for controlling the operation of audio and video devices; downloadable computer software which enables users to control and improve audio equipment sound quality