I haven't even thought about using phones to drive the DACs. What connections are they using, i.e., what kind of cable? Would I need an app? I currently don't use my phone for audio at all, because the headphone out sounded bad with all of my IEMs. I don't even remember what app I used for music when I tried it almost a year ago (I think I just tapped the file and noise came out... and when I say noise, I mean noise).
I will soon have a Fiio X3 with line out capabilities that I could try with the DACs. However... the focus of this test is sound comparisons using my computer's USB or Optical outputs. If I have time to try the phone or the X3 I will, but recognize that I might have as many as 14 DACs to test over a few weeks, and time is going to be very tight. Please don't be disappointed if I can't get to the phone test.
Hilo supports iPhone, iPad via usb cable
Check the manual and you will see.
Not sure about android devices.
Edited by yfei - 12/1/13 at 10:10am