First what you really want to know. Is the HD800S the HD800 with the hot peaky treble fixed? Yes. Sennheiser had the testing equipment and the engineers to take the “6 khz mod” and optimize it until they could really address the treble problems so well described by reviewers on Head-Fi and other sites. I am very sensitive to harsh sounding headphones and other gear, so I was on pins and needles waiting for the HD800S to arrive, wondering if I had blown two grand on a pair of headphones I would not enjoy listening to. After 50 hours or so of burn in...