Audio apparatus; apparatus for the reproduction of sound; apparatus for the processing of sound; amplifiers; signal processors for audio speakers; loudspeakers; loudspeaker systems; loudspeakers for vehicles; in-vehicle infotainment systems; headphones; parts and fittings for all the aforesaid goods; software for signal processing; software for processing sound signals; software for controlling apparatus for the reproduction of sound; software applications for mobile personal electronic devices for signal processing; software applications for mobile personal electronic devices for processing sound signals; software applications for mobile personal electronic devices for controlling audio apparatus; software for controlling apparatus for the reproduction of sound; software for in-vehicle infotainment systems.