Amplifiers; Headphones; Microphones; Audio amplifiers; Audio mixers; Audio speakers; Signal processors for audio speakers; Sound mixers; Soundbar speakers; Wireless transmitters and receivers

MEGAPHONES, EARPHONES, CABINETS FOR LOUDSPEAKERS, [ VIDEO PLAYERS, ] LOUDSPEAKERS, [ TELEPHONES, ELECTRIC SOCKETS, ELECTRIC PLUGS, GALVANIC CELLS, ] SPEAKING-TUBES, [ BATTERY CHARGERS AND ] TIME-DELAY REVERBERATION UNITS