“Antiphon Stein” is a site-specific sound installation in the nave and choir of Minoritenkirche in Krems/Stein that engages with the architecture and sound of this church space. The material used are hanging and lying flat objects of glass and metal that are played with sound pressure transducers. These objects thus become membranes that resonate in their entire surface and mass, exuding sound to the surrounding space. The initial sounds for the installation are largely generated using a special four-channel recording technique; after the digital editing, they are left in their special four-channel arrangement, since capturing the sound from various spatial perspectives and distances allows an acoustic image of the existing space to emerge. The sound of the specific space thus plays a central role in the overall acoustic image.