I don't know about the Oppo Sonica. It uses a switching power supply and from my own experiments that is a big no-no in analog stages. I have also tried iFi audiophile power adapters that uses noise cancelling technology and my $40 linear power supply decimated it. I measured the noise on a Tektronix 150Mhz analog scope and the switching supply had more noise although both were quite low and I was getting to the limits of my scope.
