One of the general concepts I've heard for room treatment is to treat one each of the opposing walls. Making the wall opposite the speakers less reflective seems like a good way to start. Rugs are awesome too, + and + to above comments.Are your speakers on the long wall or the short wall?
Speakers or room
I have a very lively room. Tile floors, large window and open area. If you clap there is a loud echo. Furniture is limited. I set up Kef LS50w and the sound is recessed not forward. The room is 26 x13 and even up close it doesn't sound good. Is it the room? What should I do ? Wife acceptance factor comes into play.