@carlsbad2 Jerry, intuitively it makes sense that the low power requirements of DAC's & Streamers wouldn't benefit by upgraded power cables, but my experience proved otherwise. I had my Shunyata dealer send me 3 Shunyata power cables, including the lower priced Alpha v2 NR, the medium-priced Sigma v2 NR and the higher priced Omega QR-s. All 3 power cables were burned in for a minimum of 250 hours. Of all of my equipment that includes a Gryphon Antileon EVO amp, Gryphon Pandora pre-amp and dCS Rossini Apex DAC / Streamer, I heard noticeable SQ improvements with the highest-end Omega QR-s power cable connected to my dCS DAC / Streamer, which I wasn't expecting. Furthermore, you would think that the massive Class A Gryphon Antileon EVO amp would also benefit by the QR-s cable, but I heard no noticeable difference between the highest end Omega QR-s cable vs. the medium-priced Sigma v2 NR power cable.
This seems to suggest that you need to ignore any assumptions and field test various options to find the best overall system synergies.