I have a Cambridge Audio DAC Magic Plus playing high-res files from my MacBook Pro. What connection will give me the best quality (24/192) out of the Mac into the DAC; USB 2.0, S/P DIF co-axial or TOSLINK optical? I don't think USB (even 2.0) will go above 24/96. I have a great system, will I even hear a difference between 24/96 and 24/192? Thanks for your help!