I don't think its a ground loop because whenever I unplug my DAC from my PC all noise ceases. If I plug my Note 3 or my iPod 5th into the DAC there is no noise either. I dunno. I bought ferrite chokes for my USB cable in hopes to eliminate the interference. Maybe I should pick up a USB ground loop isolator as well.
*shrugs*
One post was deleted by the mods I presume...
1. Nope, rear USB.
2. I ordered snap on ferrite chokes for the cable and will see if they help when they arrive.
3. I have zero experience with circuits and soldering... so yeah, I'd just rather buy something.