Apparatus for use in controlling electricity, namely, electrical conductors, switches, transformers, accumulators, and voltage regulators, and electronic controllers for use in reducing power consumption; apparatus for recording, transmission or reproduction of sound; pre-recorded magnetic data carriers featuring music; pre-recorded sound recording discs featuring music; data processors and computers; loudspeakers and loudspeaker systems; microphones; amplifiers; sound and video receivers; sound and video recording and reproducing apparatus and instruments; headphones; radio and television receivers and transmitters; gramophones, radiograms being combination radios and record players, playing decks being record players, and pick-ups; compact disc players, video disc players; music center, namely, stereo loudspeakers incorporating radio and television receivers; sound and video recording and reproducing apparatus; audio electronic components, namely, surround sound systems; sound mixers; sing along apparatus, namely, karaoke machines; monitoring, synchronizing and controlling devices, namely, monitors for reproduction of sound, digital music system that synchronizes digital music files stored on a home unit and a car unit, and remote controls for radios; cabinets specially adapted for multi-channel loudspeakers; electronic signal processors, audio equalizer apparatus, electronic crossover circuit networks for audio apparatus, digital to analog converters and digital signal processors; digital signal processing apparatus; computer hardware and computer software for digital signal processing; high fidelity apparatus, namely, sound recording apparatus for use in reproducing sound with little distortion; stands specially adapted for amplifiers, sound mixers and processors, and stereo and audio speakers; replacement parts and fittings for all the aforesaid goods; accessories for all the aforesaid goods, namely, multi-channel loudspeakers