I recently emailed JDS Labs that I had a Schiit Cthulhu lying around and if it was compatible with a JDS Atom DAC/Amp stack. I was told yes, but may be slightly limited at high gain due to the 500mA limitation for the amp. Does anyone have experience with what kind of limitation this would be? Headphones I'd be using with this are the HD6XX and AKG K7XX. Would this cause distortion trying to drive the HD6XX?