Megaphones; Metronomes; Microphones; Radios; Subwoofers; Acoustic membranes; Audio mixers; Audio- and video-receivers; Cabinets for loudspeakers; Effects pedals for guitars; Electric and electronic effects units for musical instruments; Horns for loudspeakers; Loud speakers; Loudspeaker cabinets; Masts for wireless aerials; Portable vibration speakers; Sound transmitting apparatus; Wah-wah pedals; Wireless indoor and outdoor speakers; Wireless microphones with integrated speakers