Quote: Originally Posted by
durwood 
I would have to agree with DP, however you need to indentify what this "interference" is. Please be more descriptive. Is it a constant noise, does it change with speed, is it only there when the car is on, etc etc...
It is a kind of quiet hissing which sounds like its picking up the sound from inside the PC. This is logical since the audio cable runs right next to the case. My install makes it near impossible to run it anywhere else which is why I was thinking I could move the DAC to the boot (trunk) and then run a very short signal cable to the crossover. This would mean the USB cable would run where the audio currently does, hopefully without picking up the same interference.