usp... We're not trying to give you a hard time, but we are all VERY confused here.
In reply to:

My only lingering complaint is that I felt the voices were still slightly "closed" (as if the singer had his hands cupped around the mic and his mouth),


I have NEVER seen or heard anyone describe the sound of any model of Axiom speaker like that. It goes completely against everything we know about Axiom speakers. Something just doesn't seem right. The suggestions that you have been getting are from people VERY familiar with how M80s (as well as the rest of the Axiom line) sound, and we know that what you are describing indicates a problem somewhere. I'm beginning to wonder if yours have a wire disconnected inside of them. Are all of the drivers firing?


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