Just to add to the suspense, KR, I'll tell you...
...that I know what it is as well.
And Vertigo-1, you've confirmed what I've been saying all this time and nobody wants to believe! That's why I love my MS Pro so much -- and with my newest tube amp (which I won't say what it is, and which is the same as what Flumpus has
), the sound is absolutely divine. Perhaps the treble is laid back compared to the SR-325 or MS II, but I find there's almost enough of it for me (sometimes I still wish I could hear Isaac Stern's violin go a bit further on his recording of Brahms chamber music). I'll just have to wait to do a much longer audition of the Stax Omega2 to see if there is a headphone that can beat my MS Pro's treble. I already know the Orpheus can, but I'll never be able to afford that.