What is the best power cord for pass labs xa100.5?

There is no doubt in my mind Nelson Pass selects the best power cord for his products. Maybe you need to look elsewhere if you are not satisfied with the sound.

There is no definitive "best" of anything. There are way too many variables involved. The "best" you can hope for is to find something that works well in your system. You can then say it's the "best" for you until you find something you think is better !!!!

Actually I didn't try to use the original power cords 'coz it doesn't look fancy so I used the cords I bought from ebay . . . thinking that it will sound better. Thanks to Rrog, the original sounds great. Nelson Pass can't go wrong.

My amp is 5 feet from the wall outlet, therefore, I found a 6 foot PC to work best.

Ahhh powercords. The interesting things folks say about powercords.
I am a Pangea nutcase.
Prior to Pangea, I was convinced all powercords sounded the same.
Then along came a Pangea AC9. I stuck it on my amp and instantly could hear more bass. I was like wow...

So now i just bought a Pangea AC9SE, the upgrade verssion.
I stuck it on my Furman REF20i power conditioner JUST to break it in. I was amazed. It really made my system sound better. Clearly improved tonal balance.

Tried in on the other Powerconditioner,(PS AUdio P600 used just for digital components) and NOTHING, just more etched upper freq. Jeesh, not for that spot!
Wow. So i bought a second for the amp. a little better.
Tried the amp one on the preamp. WOW bass like never before. I have to buy a third four meter Pangea AC9SE to keep at the preamp for when I want to rock out. (I cannot keep it on all the time as my apt dwelling precludes makinga lot of noise/ heavy bass)

The two meter one I tried on DAC, not great, Rudistor RPX33mk2 good, could buy one for it later on. Though I could use the spare one for the preamp on the headamp when not using it for the preamp.
SO yeah, damn right power cords CAN possibly change your life.
Just depends which ones, where.
This is MY experience with powercords.
Your experience may vary considerably!!!!!!!!!!!!!!!!!!!!