In this short chapter, Supper introduces three types of sound installations: those that possess what he calls closed systems, open systems and closed systems that can be react to outside influences. He exemplifies all three types.
Technische Systeme von Klanginstallationen (Technical Systems related to Sound Installations)
Klangkunst: Tönende Objekte und klingende Räume. Laaber: Laaber Verlag, 119-134.