There was another post about Rooms today:
There is no room that is acoustically correct without treatments. Rugs and drapes are not very good and could actually make your room to dead. You need a mix of absorption and diffusion. All corners will accumulate bass, this can be wall corners, soffit corners. Then there are 1st reflection points: in front of speakers on the floor, ceiling, side and the 1st reflection point for the opposite speaker.
The room is 1 of the most important pieces of an audio system