My older Pass Aleph 3 manual states that an aftermarket PC would do little to improve the sound, due to the highly regulated PS he uses. I suppose Nelson is still of this opinion with his latest amps.
I used a Oyaide Tunami Cryo GPX with Furutech terminations and heard a nice difference over the stock cord. Clearly more dynamic and sound that was more open and deeper tighter bass... I would think any truly good PC that is worth is metal is going to do better. But like everything else, Its critical to get a good system match..you must try different cords and hear the difference for yourself as to which suits your preference.
I used a Oyaide Tunami Cryo GPX with Furutech terminations and heard a nice difference over the stock cord. Clearly more dynamic and sound that was more open and deeper tighter bass... I would think any truly good PC that is worth is metal is going to do better. But like everything else, Its critical to get a good system match..you must try different cords and hear the difference for yourself as to which suits your preference.