My experience with power cords is very limited, but my working theory is that there's a lot more involved than just the power cords and equipment. In my case, a W Audio power cord improved my system on my integrated amplifier but didn't seem to make much difference on any of the other components. In all, I have three W Audio power cords. I think that cords are a hit or miss adventure, which is why I opted for the $50 power cords to see how my system responded. The results were great.