New to this world and just bought a pair of HD58X's. Main use will be at home hooked up to my PC however, if I could find something for weekend use in the car that would be ideal. I have a aux port and usb port in the arm rest. I can play audio files off of thumb drive so I'm guessing it is possible to plug the DAC/AMP in there. Or run RCA to AUX cord perhaps? So far I've looked at the FiiO E10 and the massdrop 02 combo. Any suggestions are welcome!