Tvad,
I am using Audience powerChord on the amp. It's been resident on it for a while now, about a year or so.
Volex works good on the Pass amp, but Audience and Shunyata Taipan are better, although I moved the Taipan Helix to my preamp because there it sounds best in my system with the current combination of cables I have. Although the difference between Volex, SHunyata Taipan Helix Alpha and Audience powerChord on the amp isn't all that big at all, still, the Audience and Shunyata sound just a tad better, more natural I'd say, especially in the upper mids and treble. But as I mentioned before, the diff isn't probably worth the money. I already had all the cords, so I was able to find the optimum place for each, but yes, on the Pass Labs amplifier, the cord isn't that major of a deal. If the Volex works for you, keep using it, because the improvement you will get with a cord costing 100 times as much as the Volex will be a questionable improvement, in terms of whether or not you'll get your money's worth in sonic gains. Not so much credit to the Volex for being a great power cord, as to the amplifier design. Pass Labs did a good job. Now finally we don't have to spend a fortune on a power cord for a component in order for it to sound the way it's supposed to. I am happy with the Audience powerChord on the amp, that I purchased used right here on Audiogon, although if I didn't have these power cords on hand at the time, I'd probably be happy with the Volex on the amp as well.
