No. I changed my post to show Headroom's plot, but the HD800 is in the current issue of Stereophile, so it's not online yet. It's on p. 89 of the orange-framed issue with a Boulder device on the cover. The phase is really mild -- I don't think it strays more than 15 degrees. I can attempt to describe the impedance plot verbally: there's a peak at 100 Hz, but the peak is at 310, the minimums appear to be at 210 (starting at 10 Hz, and another swale around 1.1kHz-1.4kHz), and then slowly going up again, to about 300 @ 50kHz. You can look around the Stereophile site, or check Audio Asylum -- I think he posts there, there might be some discussion, I don't know.