Bought a Audeze 1/4in to 1/8 in adaptor...plugged the D7k into the humble Fiio E18...
and boy, that sound is so engaging...almost the best i have heard out of the D7k amongst all my possible setups.
( did the same to my fren's Fostex TH900...similar effect..v engaging, i think my D7k with Jmoneypads is airier. :P )
The Fostex is slightly more resolving...but for a whole lot more $$ )