I don't remember what Tyll wrote exactly, but I did get the sense that some people (you know, the type that tend to be really keen on minor stuff, like many of us here) who heard the HD800S early on thought the bass gave us a warmer and more fuzzy feeling than the HD800. For most listeners, the differences in the bass are insignficant. But when people like me are splitting hairs on DACs, such a change may not necessarily be welcome*. SBAF being SBAF, or Tyll being Tyll, probably wanted to peak into the measurements to see what was going that might explain what we were hearing. How this became a measurement war, or a measurements-for-the-sake-of-measurements thing, I scratch my head. My question to Jude is what does he hear? * My position remains that if one is willing the mod the HD800, then the HD800 is preferable to the HD800S, especially given the price premium of the HD800S over the HD800.