hey guys, I'm new here and I just got the FA-003 :) anyways, I'm looking for an amp for this headphone. I'm currently using Xonar DX and I feel that I need a little more oomph.   Thing is, i'm thinking of having this route, Xonar DX -> optical out -> amp/dac (suggest one for me) -> FA-003 Or should I just get a usb dac amp? i.e Audinst