Loudspeaker cabinets; loudspeaker cables; loudspeaker drive units; loudspeaker housings; loudspeaker installations; loudspeaker stands; loudspeaker stands [adapted for]; loudspeaker systems; loudspeaker units; loudspeakers; audio loudspeaker systems; cabinets for loudspeakers; cases for loudspeakers; horns for loudspeakers; racks for loudspeakers; studio monitor loudspeakers; amplifier tuners; amplifiers; audio amplifiers; audio frequency amplifiers; computer software for controlling amplifiers; control amplifiers; digital amplifiers; electrical amplifiers for sound signals; electroacoustic amplifiers; headphone amplifiers; integrated audio amplifiers; loudspeakers with built in amplifiers; power amplifiers; pre amplifiers; racks for amplifiers; signal amplifiers; sound amplifiers; sound amplifiers for musical instruments; sound mixers with integrated amplifiers; stereo amplifiers; tube amplifiers; valve amplifiers; audio mixers; microphone mixers; power mixers [audio apparatus]; sound mixers; digital signal processing apparatus; computer software for controlling the operation of audio and video devices; software to control and improve audio equipment sound quality; audiovisual apparatus and instruments; speaker docks; speaker enclosures; speaker mounting brackets; speaker switches; speakers; speakers for computers; speakers for portable media players; speakers for record players; audio speaker enclosures; audio speakers; audio speakers for home; auxiliary speakers for mobile phones; loud speakers; mobile phone speakers; monitor speakers; portable speaker docks; portable speakers; portable vibration speakers; public address speaker systems; signal processors for audio speakers; smart speakers; soundbar speakers; wireless audio speakers; wireless speakers; audio equipment; speakers [audio equipment]; vibration dampeners for electronic audio equipment; audio apparatus; audio electronic apparatus; audio frequency apparatus; audio mixing apparatus; audio processing apparatus; audio switching apparatus; audiovisual apparatus; control apparatus for audio signals; digital audio interface apparatus; equalisers [audio apparatus]; equalisers being audio apparatus; high fidelity audio apparatus; parts and fittings for audio apparatus; racks adapted to house audio apparatus; apparatus and instruments for processing sound; apparatus and instruments for reproducing of sound; apparatus and instruments for transmitting sound; apparatus for amplifying sound; apparatus for the processing of sound; apparatus for the reproduction of sound; apparatus for the transmission of sound; apparatus for transmitting sound; portable sound reproducing apparatus; sound amplifying apparatus; sound generation apparatus; sound measuring apparatus; sound mixing apparatus; sound reinforcement apparatus; sound reproducing apparatus; sound reproduction apparatus; sound transmitting apparatus; electronic audio signal processors for compensating sound distortion in speakers; signal processing apparatus; computer hardware for signal processing of audio and video; apparatus for wireless transmission of acoustic information