Wikipedia
Acousmonium
The Acousmonium is the sound diffusion system designed in 1974 by Francois Bayle and used originally by the Groupe de Recherches Musicales at the Maison de Radio France. It consists of 80 loudspeakers of differing size and shape, and was designed for tape playback. As Bayle wrote in a CD sleeve note in 1993, it was
The Acousmonium is still in use today – it was used for a series of concerts of electroacoustic music held at the Institute of Contemporary Arts, London in May, 2006.