I just purchased the M60's, and have been listening to them for the past 2 days. I noticed some brightness only when pushed to levels far greater than I usually listen to music, I had to push them hard, kinda like getting a new car, and wanting to lay some rubber. I noticed that the speakers just seemed to play better as I pushed them harder, only when I pushed them to wall vibrating levels did I notice the harshness. My room is fully carpeted, with a huge sectional, plus a few side chairs. I believe this helps keep the speakers from sounding harsh.
