Here is a link to measurements done by Rin Choi: http://rinchoi.blogspot.com/2013/05/beyerdynamic-dt-1350.html
Although distortion is bit high, I still love my DT1350.
Actually that bass distortion isn't bad, as the midrange is clean. My biggest issue is the 10k spike/ringing, but most supra aurals have that issue by design.still the best supra aural design IME
Edited by Inks - 5/14/13 at 6:15pm