External portable DAC for Arkamys car audio system

[alladinkachirag]

I am at a loss to understand which DAC will output a digital file back to connect to the system through USB!!

DAC = Digital to Analog Converter

True - all those experiments were useless if we consider the concept itself. There is no two way communication, since the DAC input from USD is kind of "slave", and so inability to pass back the information.