When I first received my m60's I too was afraid that they sounded "bright" or "harsh" occasionally. I think the truth was that my expectations were so high that for the first time in my life I was listening to the music with a critical ear.
After listening for awhile, I identified a few passages on a few CD's that especially exhibited the bright characteristic, and then listened to those same passages with some other equipment like my car, a pair of headphones hooked directly to the CD player, and through my computer speakers. I found that those CD's sounded crappy no matter where I played them. I couldn't believe that I hadn't noticed it before, but once I realized that it was the source material and not the speakers, I started enjoying the m60's even more.
I still love how great they sound, regardless of how hard I push them.
