An audiospotlight (a special speaker which produces a very pointed soundbeam (the equivalent of a laser beamer for sound) is fixed on the ceiling. The soundbeam coming from above reflects on two plates beneath the speaker in a height of around 1,50 meter from the ground.
The plate is installed at an angle of about 45 degrees and the audience is allowed to rotate it. The extreme bundled sound beam reflects from the obliqued plate to the walls. The reflecting
sound can be moved through the whole room. Because of the reflections it seems that on the walls are hundreds of speaker, because of the reflecting sound source.