 In taking the lead on work that began in the early 1950s, with Jacques Poullin's potentiomètre d'espace, a system designed to move monophonic sound sources across four speakers, Bayle and the engineer Jean-Claude Lallemand created an orchestra of loudspeakers ("un orchestre de haut-parleurs") known as the Acousmonium in 1974 .An inaugural concert took place on 14 February 1974 at the Espace Pierre Cardin in Paris with a presentation of Bayle's "Expérience acoustique" .The Acousmonium is a specialised sound reinforcement system consisting of between 50 and 100 loudspeakers, depending on the character of the concert, of varying shape and size.