Here is the DAC and amp combo I am running with Volumio on Cubox:
head-fi.org/t/258967/headamp … der-thread
I have had this unit for about 6 months and the sound quality is extraordinary, even with AAC files on an iPod. Looking forward to getting the last issues with the Volumio install on the Cubox resolved so I can have my entire flac music library in a handy portable form. Planning to use it as my camper sound system.