Acoustic devices; Apparatus for processing audio signals; Audio apparatus; Audio equipment; Audio installations; Audio processing apparatus; Audio racks adapted for use with audio equipment; Audio signal processing apparatus; Audio switching apparatus; Audio signal level controlling apparatus; Crossover networks for audio apparatus; Digital audio players; Digital audio signal processors; Electric amplifiers (signal); Electric leads for amplifiers; Electrical amplifiers for use with musical instruments; Electroacoustic amplifiers; Audio electronic apparatus; Electronic amplifiers; Electronic audio apparatus; Electronic units for transmitting audio signals; High fidelity audio apparatus; Integrated audio amplifiers; Cabinets for loudspeakers; Free standing loudspeakers incorporating boxes; Hi-fidelity loudspeakers; Horns for loudspeakers; Housing specifically adapted for loudspeakers; Loudspeaker apparatus; Loudspeaker boxes; Loudspeaker cabinets; Loudspeaker chassis; Loudspeaker enclosures; Loudspeaker housings; Loudspeaker installations; Loudspeaker stands (adapted for); Loudspeaker systems; Loudspeaker units; Loudspeakers; Loudspeakers for mounting on walls; Loudspeakers for use in cinemas; Loudspeakers for use in theatres; Mounting apparatus adapted for use with loudspeakers; Power output amplifiers; Public address amplifying apparatus; Racks and mountings specifically adapted for use with audio, visual, computer and telecommunications equipment; Acoustic apparatus for reproducing sound; Apparatus for amplifying sound; Electric amplifiers (sound); Electrical amplifiers for sound signals; Electronic audio signal processors for compensating sound distortion; Power amplifiers for use in sound reproduction; Sound amplifying apparatus; Sound and vibration absorbing and damping fittings and feet, especially adapted for use with audio equipment; Audio speakers; Audio speakers for home; Electric leads for speakers; Monitor speakers; Portable speakers; Public address speaker systems; Speaker switches; Speakers (audio equipment); Personal stereos; Stereo amplifiers; Stereo hi-fidelity apparatus; Stereos