It should also be mentioned that after giving the audio world the AR series of loudspeakers and turntables, Edgar Villchur went on to invent multichannel wide dynamic range compression for hearing aids. Characteristically, Mr. Villchur chose to openly publish the results of his R&D and make it available to anyone who wanted to use it rather than patent it, and today it is the technology on which virtually every hearing aid in the world is based.