Actaully, he's the third one to state such a thing. Me, someone else I don't remember and Nimzerz.
Whether we are talking about the same thing.. I'm not sure. I'm just talking about what I hear as a slight edge in the upper mids, mainly heard on vocals and instruments for me. But I'm going off memory here.
Presently, I am using velours for both my 5le and 500.