Just want to keep the ball rolling...My only experience with room treatment was a silly disaster! Way back when, I had maggies and someone suggested eggs cartons (you know, the cardboard type). I don't even remember what I was trying to correct. Anyway I glued about 100 of them to the cieling of a rented house/room (it was doomed to demolition anyway). Looked awful, did nothing for the sound and they kept falling off. One day one landed on my turntable and destroyed a rather pricey cart. Needless to say they all came down instantly. Other than that I've been lucky having acoustically friendly rooms. I'm pretty good at dialing in my speakers wherever I live. My present space is a medium size one in a 18th cent. cottage: stone walls 2foot thick, rough rendering (inside) no parallel surfaces, concrete/tiles floor poured on bedrock, heavy wood board flooring on big oak beams. Nothing moves, nothing resonates and there are no audible nodes to worry about. If and when I move I may have to learn some tricks (egg cartons not being one of them).