Apparatus for recording, transmitting and reproducing sound and images; acoustic meters; electroacoustic sound transducers; cabinets for loudspeakers and loudspeaker systems, amplifiers, controllers and processors therefor, namely electrical controllers and audio processors

Planning and design of electroacoustic sound transducers and loudspeaker systems and conducting of technical feasibility project studies relating to electroacoustic sound transducers and loudspeaker systems