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I was gonna use foam carpet underlay.. its rubberized on one side.. and not too thick... its not like i will be sleepingin it during winter months.. unless the women kicks me out...
J.C. Whitney, and others (try a heating/AC shop) sells self adhesive rubber sheeting that really cuts down on the drumming noise the sheet metal panels can make. Fancy stuf like Dyna-Mat is not required unless you are getting very serious with your audio system.
I looked at several options and I think I'm just going to use indoor/outdoor carpet. It should sound proof as well as insulate. I can choose a color to match.