Here is a link to an article by Steve Deckert that you might find interesting on his efforts to get a room slightly larger than yours to work well as a dedicated listening room. (His room was 13x15.) His experience might at least help you identify some of the challenges and possible solutions, even if you don't pursue all of the room treatment options.
http://www.decware.com/achowto.htm
http://www.decware.com/achowto.htm