Electrical and electronic apparatus and instruments for use in connection with recording, transmission, reproduction, reception and amplification of sound or images, including loudspeakers, tuners, amplifiers, analogue and digital converters, DVD and CD players and recorders, microphones, and sound mixers; parts and accessories, (not included in other classes) for the aforementioned goods, including headphones, subwoofers, remote controls, antennas, converters, decoders; hardware and software for use in connection with recording transmission, reproduction, reception, correction and amplification of sounds or images, including loudspeakers, tuners, amplifiers, analogue and digital converters, DVD and CD players and recorders, microphones and sound mixers; electrical and electronic apparatus and instruments for correction of sound, including apparatus and instruments which correct the interplay between loudspeaker and the surroundings with a view to optimizing the sound quality