Think this will depend on your system also. There have been advances in technology for sure, the question is can your system maximize these upgrades. It could be like putting Pirelli T-Zeros on a 1978 F-150.
Older Power Cables
In my current system, I have three older moderately expensive power cables: 2 from PS Audio purchased about 24 years ago for $600 used and one MIT Zip Cord II purchased new. I was just wondering what will differences will I likely be able to "hear" by replacing them with some of the newer power cords that is currently being market.