 Kloss had a loft in Cambridge, Massachusetts where he was making loudspeaker cabinets, and the two men became business partners in Acoustic Research, Inc. (AR) in 1954.The partnership lasted until 1957, when Kloss left to form KLH, manufacturing loudspeakers using Villchur's acoustic suspension principle, under license from AR.Over the next two decades, almost all major loudspeaker manufacturers gradually changed from mechanical to acoustic suspension.