Does the burn in time apply separately to the headphones section than to the DAC direct mode? My loan DAVE would have had much less burn in time in headphone mode, but I assumed both modes were much the same, other than a different socket and a digital volume control. BTW, I think I now understand at least partly why I didn't get on with the HD800S in my comparison review: I've since seen Tyll's frequency response graphs, which show the 800S to have a slight dip at 1khz and a big peak at 6khz. This could explain why I found female vocals to sound thin and lacking in body with these headphones, which the neutral DAVE would have had no impact on. I had also briefly tried my trusty old HD600's and they didn't have this particular issue, but of course they weren't as good as the HD800S in other ways. I think it was Jazz who advocates using an equalizer - this seems like one situation where an equalizer would help a lot. I don't think this frequency response issue was any way near the whole story to my comparison, but it would have been a contributing factor.