I am very convinced that the first run of these were totally broken (which isn't out of the question. These marked AKG's transfer to fully outsourced manufacturing.). I bought mine less than two weeks ago, and I find them molasses dark with some of the best treble I've ever heard. They honestly remind me a bit of the LCD2 rev2.
Edit:
Nevermind. Now I hear it. All my preferred music just coincidentally had a valley at 7k that cancelled it out. It isn't awfully obtrusive, but it's definitely there.
