DenonFanboyI'm not sure, but I'd assume something along the lines of the post-2012 revision drivers with a stronger magnet, maybe?
They're definitely noticeably different from the older D5000s.
FR seems similar to post-2012 D5000s, but with more bass, impedence and phase response also look alike.
30 square wave graphing looks more like the TH-600s though, so perhaps it's post-2012 D5000 drivers with TH-600 magnet strength?
(Interesting to note, though: the Teaks seem to measure best out of the three regarding THD, so that's cool to see.)
(Note: just checking through Tyll's measurements here and drawing my own conclusions.)
http://www.innerfidelity.com/images/DenonAHD5000B2012.pdf
http://www.innerfidelity.com/images/EMuTeak2016.pdf
http://www.innerfidelity.com/images/FostexTH600.pdf