Room Size and Loudness

I'm at the room tuning stage with my addiction and one of the various room problems I want to address is a loudness issue which plays out this way: To really get the best out of my speakers I need to run them at a level that makes them too loud for my room -- every once-in-a-while I can handle a Who concert, but I don't want to do it every time I fire up the system. I knew this could be a problem for me when I picked up the speakers I'm using (in April) but I like the speakers and the way they fit in with my system. Can I use acoustic treatments to solve this problem (I'm sure that might raise other problems -- but I need to know the options before I can identify points of compromise). For example, would lining a wall(s) with absorption foam, etc. be a solution? Any thoughts/comments would be greatly appreciated. Thanks!