I use C5D from jds labs. Works perfectly without any setup (dac function). Sound great too, clear, with no coloration. And when you need to have fun, you can always turn on the bass boost on c5d.  

   Sony Walkman A15 > Fiio L5 > C5D > ER-4PT

If you looking for super cheap then you might want to see this http://www.amazon.com/gp/product/B00QIEZ9CQ/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1   I already ordered but it will take 2 more weeks so cant say about the quality etc.

Anyone using C5D with er4PT? How's that sound to you?

Hi Everyone!   Happy user of Dt 770 Pro 80 Ohm + C5D + Xiaomi Mi3 Here!