Hi John, Not I. Are you familiar with the sursound site: https://mail.music.vt.edu/mailman/listinfo/sursound They have lots of technical info on surround sound topics. However, in order to read the archives, you must subscribe --- or so it appears to me. Personally I have not have good luck with surround sound, so I avoid it. I see it as a Rich Man's Approximation to physical modelling. Regards, Dave.