I had he same problem as you for years, room is a converted loft over a bungalow. 20' x 20' with no hard surfaces. Sound insulated, thick rubber backed carpet tiles, lots of soft surfaces and no brick walls. It was a really dead space. It all changed for me when I bought my Kef Ref 5 speakers. I think the way the UniQ tweeter distributes a wide dispersion has definitely improved the sound. That forced an upgrade on other equipment and now the quality of the system really does benefit from a dead quiet room. I wouldn't change it. My friends have the opposite problem, trying to dampen down rooms that are far too lively. This is a bigger problem I think. Persevere with your room, when you get it right you will love it. Check out the pics of my room if you like, I don't know how to post an image here - Audiogon don't make that easy!