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

Different preferences?

I think its a bit of both, I've heard power cables make bigger differences on some amps than others. If the power supply in the amp is properly designed then pc's should make less difference. Some of the top ss amps now have power factor correction built in as well. IME a lot of the boutique power cables are detrimental to sound due to poor design, they seem to be built by marketeers rather than engineers. This is really what audiophiles deserve though - look at some of the recent post/questions - power cables that will speed my power amp up, power cables that will give me more bottom end. The number of posters here looking for cables to fix a system issue is unbelievable.
The amp that reacted least to pc changes was my Rowland monos and some Airtight ATM3 monos.

The original pc's work well, for now. I have read other set-up that transparent premium power link is a good combination with pass amps. I then look at the technical specs of transparent and it seems I will gain substantial improvement. Maybe in the weeks to come I might be able to try one. I will let you guys, thanks!

No matter what Powercord will be used, all of them have upgrade plugs. The Plugs have in general an improved contact area and I think, this is one of the real advantages. You can try those with the existing Power Cord and I think, you will get an improvement, too. I bought those from Oyaide, internally they are really good. I use some of their Tunami cords, they are a real serious solution (technically and from the material inside), shielded and safe.

I agree with increasing the contact area, the main issue I see on 15amp iec sockets is they are loose, even the audiophile types. I always replace these with either 20amp with their increased contact area and much tighter fit or hardwire straight into the equipment. The Tsunami in my system sounded very beautiful tonally, but the sound was very slow and slugged when trialled on both source and amps compared to the MIT I use.