Tonstrahlen is installed at the porch of parochial church, an equipment of parabolic bowls. Every bowl has a high frequency source (piezo element) at its focal point which is emitting sound waves into the bowl. These waves will be bundled by the parabolic curvature and beamed into the room as a ray of sound. Tonstrahlen are crossing the porch like straight lines and appear on the walls and at the ceiling. The sounds act ghostly, one locates them where no sources are (no loudspeakers).

A multi channel composition of Bernhard Leitner, basing upon voice particles and speech sounds, combines these acoustic "pictures" to moving and gesturing shapes overlaying the architecture. The central nave of parochial church once got a mightful dome which was destroyed in World War II. Nowadays one looks directly into the frames of the open truss. With his installation Tonkuppel Bernhard Leitner wants to evoke acoustically the vault of the impressive hall.

A cylindrical object will be centered at the floor of the central nave and emit trombone sounds going up vertically to the truss, where they widen and swell and generate a virtual dome. First the "substance" of this dome is anchored to the ground but soon will detach from its seeming gravity and is unfolding to full volume by gaining height. That is creating the impression of a vaulted dome. The rigid geometry of the truss will be counterpointed by the dynamics of the acoustic shape. The reverberations move up and down and sort of measure the hall's vertical dimension. Making it a sculptural experience embedded into the surrounding architecture.