I just got my Bifrost 2 today too and let it warm up a few hours before listening with Asgard 3 & Verite open. Which gain setting do you prefer for HD800? Do you have SDR mod in? On only a few tracks I detected some slight treble unpleasantness but only on high gain, I noticed it before with Modi 3 and assumed it was the DS stuff, but now think it is Asgard 3. Edit: I just needed to leave the Asgard on for a few minutes prior to listening. Now beautifully smooth with no treble nasties.