Blazer, I have some excellent PC's but the best ones are my two Purist Dominus (Domini ?) anyway, I definitely use one on my amp (into my EP15) and I was going to use the other on my Wadia 27 DAC (a popular app for a big cord) but I called Jim Aud at Purist and asked him. He said if I only had two, to put one on the amp and the other on the EP. Of course I asked 'why?' and he said, "Energy transfer" (Jim's a man of few words ;--) But I pressed on and he explained that you want to have the biggest (AWG) and best PC's where you need the best energy transfer (ie where you are pulling the most power.) So (especially) if you have an amp plugged into you EP as I do, you need to feed the EP with a cord at least as big and high quality as the one on the amp.
.
.