NFB-10 sounds better on good power cables and the difference is fairly clear, although I have not blind tested. However, I did repeated blind tests with my previous DAC (Lavry) and never made a mistake between stock and audio-dedicated (AudioNova). On stock cables Lavry sounds awful, sharp and dirty. It seems to be a common assessment among Lavry users since two more people from Audiogon confirmed this.
I am not sure about the physics and science behind. It may depend on the quality of your voltage, maybe also EMI / RFI -- I live in a noisy area downtown. Maybe the quality of DAC's internal power filtering, because the effect was lesser on NFB-10 -- its psu section is definitely way better than Lavry's.
http://www.auricles.com/new_page_41.htm + http://www.hifiwigwam.com/showthread.php?654-The-Great-Cable-Debate
results (be interesting to see the same 'study' with multiple tries per person
I'd also like to see RMAA tests with different power cables showing up as a measurable difference .
Don't know what your testing procedure is (most likely some flaw cluing you into what cable is what?), but you must have mega-golden-ears
Edited by svyr - 4/6/11 at 9:51am