I found that a few hundred $ in acoustical panels for 1st and 2nd reflection points made a huge difference in my room. I currently have six panels in a small room (4 on the side walls and two in the rear). I am no good at describing sound changes; however, it was a greater (or more noticable) improvement than any change in components that I have made over the years.

I hope this helps.

--------- NEC 42" Plasma Axiom M60s(x3)/QS4s/M22s Denon 3805/3910 Outlaw 7700 SVS PC-Ultra