I notice a nice "clarifying" effect (I really can't describe the exact change, but it was definitely better) when I added a 12x9 area rug to my room. It also seems to have made the M60s image much better.

Prior to that, it was bare hardwood between the speakers and I...

M- M60s/VP150/QS8s/SVS PC-Ultra/HK630 Sit down. Shut up. Listen.