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Two loudspeakers can create sounds that appear to exist in thin air between them. For immersive systems, three loudspeakers combine to create sound images in the triangular area spanned by the three loudspeakers. In both cases the sound images are described as ‘virtual’, because they only exist when the loudspeakers are working together to create the illusion of their existence. The virtual sound images span a sound stage, the area typically between the loudspeakers, where all the sound seems to exist and where we also hear depth and dimension.