Today I got a PS Audio Prelude power cord to replace my existing stock power cable on my integrated amp (specifically, the cord from my integrated to my power conditioner).
I've been critically listening for hours, and I'm certain there's a clear improvement. Music is more resolving, low registers are fuller, and there's more overall tonal enjoyment. I'm sold!
Well, I guess this means I'll be upgrading all my power cords...great. This f*&cking hobby is ridiculous!