OPQRST

Loudspeakers; Megaphones; Microphones; Radios; Transponders; Acoustic membranes; Audio interfaces; Audio mixers; Audio- and video-receivers; Cabinets for loudspeakers; Compact discs featuring music; DVD players; Earphones and headphones; Equalisers being audio apparatus; Horns for loudspeakers; Pickups for telecommunication apparatus; Sound recording apparatus; Sound transmitting apparatus; Video recorders