Electrical and electronic apparatus and instruments for use in connection with [ recording, ] [ transmission, ] reproduction, [ reception ] and amplification of sound [ or images, ] namely, [ loudspeakers, ] stereo and multi channel [ tuners, ] amplifiers, [ analogue and digital converters, DVD and CD players and recorders, ] surround sound decoders, [ microphones ] [ and sound mixers, ] and replacement parts therefor and accessories not included in other classes for the aforementioned goods, namely, [ headphones, subwoofers, antennas, converters, infrared and radio frequency remote controls for loudspeakers, stereo and multi channel tuners, amplifiers, analogue and digital converters, DVD and CD players and recorders, ] surround sound decoders, [ microphones ] [ and sound mixers ] ; [ computer and ] digital signal processing (DSP) hardware and computer software for use in connection with [ recording, ] [ transmission, ] reproduction, [ reception, ] correction and amplification of sound [ or images ], namely, [ loudspeakers, stereo tuners, ] amplifiers; [ and digital converters, DVD and CP players and recorders, ] [ microphones ] [ and sound mixers; ] electrical and electronic apparatus and instruments for correction of sound, namely, apparatus and instruments which correct the interplay between loudspeaker and the surroundings with a view to optimizing the sound quality