Thank you SpiderNhan and ClieOS.  Disabling USB charge appears to have done the trick.  This DAC is a lot better than any Ive owned before.  Looking forward to when the ATH-M50s get here

So I apologize if this is a bit of a n00b question but this is my first USB DAC so I want to make sure I got this right...   I ordered a new e17 and a set of ATH-M50s on the recommendation of a friend who has a e7 paired with the same headphones.  I have a Fiio E10 and wanted something...