For my ARC/magnepan system, the uef black power cables sound incredible. my CD player and pre have the 12 gauge, and the poweramp has the 10 gauge. Im sure as you go up the line into the atmosphere line, improvements are there, but those power cords are out of my budget. I am verry happy with them. I too got them because I was so impressed with the black fuses. I know I could go back to not having them.