Here's a spreesheet you can look at. Notice the desired sabins and then the material types and their total surface areas. This won't get you into diffusion, angles or other insteresting variables. It's just for a simple cube. It might even be the last room we built. I don't recall. There's a book titled How To Build a Budget Home Recording Studio. I can't recall the author name or publisher. It's not Micheal Shea. I'll remember it within a day. It's an old book that's out of publication...Kennedy, O'Toole, crap, apparently I need more coffee. I suspect my partners and I will publish some realtime impulse and response tools that we've developed for another project. Room analysis and filtering is one of our interests. It could be a couple months before we get around to it. ron --- Noah Roberts <roberts.noah(a)gmail.com> wrote: http://www.acoustics-noise.com/RoomModesCalculator.shtml __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com