So then if I understand you correctly the only improvement we can expect from changing power cords is a decrease in hum and noise assuming that at least some hum and noise was the result of the power cord in the first place and not all due to other causes. Of course there are some people who would argue that even noise and hum from power cords below the threshold of human hearing will affect what we can hear by introducing some sort of audible distortion which cannot be measured. That is their perpetual arguement. They know what they hear and there is nothing anyone can say to prove otherwise. Of course they will not submit to a DBT or cite one to prove their assertion. In fact, at Cable Asylum where some of the money which funds that site is supplied by people who make and sell cables, the topic is not open for discussion and if you persist in trying, you will be thrown out. Their owner Rod proposed a mission statement which said "only positive experiences" with cables would be open for discussion. Now why would anyone want to go to a place like that? For Jon Risch, it's paradise. This self appointed tin pot god is mad with power. Mad I tell you, MAD, MAD, MAD!!!!!! Hey Phil, do you still go there? Do they still ignore you?