I have Acrolink/Esoteric power cables: (DIY:) 7N 4030's with Oyaide plugs, these took a while to burn in but very satisfying once they did
Acrolink 7N PC-6500, Acrolink/Esoteric 8N PC-8100 ( also PAD Dominus original and Rev. B )
Interconnects: Acrolink 8N-A2080III Evo XLR's, 8N-2080 ( earlier ) RCA's and Acrotec 8N 2080 ( ancient ) RCA's and XLR's; same company, different name
The gear: Solid state ( DC ) Preamp and Phono stage; a Tube power amp
The biggest single change was adding the PC-8100 power cable to the power Amp; speed + detail increased without becoming "dark" sounding, if I was going to make one upgrade only, this would be it
The 8N interconnects are take-no -prisoners, ice-in-their-veins detailed; there is no "warmth" of any kind but no coloration either; the later renditions have better connectors than the early ones
I suspect the 8N interconnects are the icing on the cake for the pinnacle of high end systems, whereas the 8N power cable will extract the very best from a power Amp is any system ( except one with a switching power supply, perhaps )
The Acrolink 7N 2090 interconnects have a touch of warmth and I suspect using these from source-Preamp, in my system at least, might be an attractive compromise