Ckoffend's comments are excellent, I think. You can do an a lot in a room with ordinary furnishings thoughtfully placed. IMHO you should resort to acoustic materiels only when you have a very specific goal and a resolution specific to that goal.
BTW, there are a lot of questions in this forum about 'room tuning', they are, however often embodied in other thread's about problems with frequency response, i.e. too bright, no bass, etc.
BTW, there are a lot of questions in this forum about 'room tuning', they are, however often embodied in other thread's about problems with frequency response, i.e. too bright, no bass, etc.