Different measurements are going to have different compensations, HRTFs, etc just as it's going to vary per person. I used headphones.com's data. Tyll's data shows a 9khz spike as well, as well as one around 13Khz(which is back down to neutral once compensated). I wouldn't worry about the 13kHz spike as much though, as there's not a whole lot going on around there.
Edited by chewy4 - 12/11/12 at 12:15pm