my room is 16 x 14 with ceilings 9' 7". my watt puppy's sound very, very good. i have no treatments with the exceptions of three floor to ceiling drapes and a painting on canvas that covers most of one side wall. i am sure some bass treatments would help out but it sounds great. a close friend who sold wilson for 15 years also thinks it sounds great.
good luck whatever you decide.
good luck whatever you decide.