[looks like you got this] what about one Topping AIO which had horribad output impedance, which Amir conveniently did not test and did not mention. Had this been a PS Audio or Schiit product, he would have had a field day. What about Amir excusing AC mains noise on preferred vendors, while calling them out on vendors he did not like. @julian67: Yes, I take this personally because people like you, who don't have the time or inclination to study complex measurements from TOTL insanely good instrumentation, end up bedazzled and befuddled. What ASR doing isn't science.