powercords

lostinseattle,
I suspect you've read about this before since you've hit pretty much every "deniers" reason why it will not make a difference in your very first audiogon post. Give a couple aftermarket power cords a try & let us know what you think. 

What exactly is being changed?

Good luck getting an answer to that question.

Here’s the deal, if you hear it, then it is obviously doing something. What that is some feel hasn’t been explained, I’ve seen explanations from different manufacturers that claim different solutions in their products. Is that true? I can’t say. Are there ways to measure this? Again, I don’t know this either. Rather than say something isn’t happening because you cannot measure it, believe your ears, and develope ways to determine what is happening, if it interests you that much. I’d love to delve into that, but real life Dosnt present me with the time to do that, and I’d have to make some connections with the proper type of engineers who were open minded enough to help with that. So flor now, I’ll just enjoy what I hear. Much like I know cars have improved in horsepower, gas mileage, reliability, etc, over the years, but I don’t need to know the technical aspects of each things done to enjoy the benefits. I tend to look at the big picture and delve into details if needed, or there’s some desire to. My brother who teaches science is the opposite. For him to understand something, he has to see it built from the ground up, and understand each detail. Not that he doubts something until he does, but he does like to see it proven to him. I believe we went to the moon, was there to watch it on tv, but not in person, I didn’t develope the rockets or technology, but I understand the ideas used and believe we were actually there. There are some who don’t believe we were and it was all done on a studio set. 

@boxer1. Interestingly, I haven’t really read about power cords before, though I have read a lot of threads about interconnects and speaker cables. I’m not trying to be a denier per se. If people hear a difference, they hear a difference.  But I would like to be clear that I did not say, or if I did then I misspoke, that it cannot make a difference. But I believe I said was, I don’t understand how it would make a difference.
However, I do encourage people to think critically about what they think they hear. There is massive evidence that confirmation bias is a powerful Influence on what the mind thinks it perceives.  That’s why I asked the question of how many people who heard a difference actually did a blind listening test. I think it’s frankly intellectually dishonest to assert that you don’t need to do one because “I heard what I heard “.  If you do a blind listening test with, say, 10 tries, and you correctly identify two cables nine or 10 times that is powerful evidence that you are hearing a difference.  But on the other hand, if you can’t do better than five out of 10, which is no better than simply flipping a coin and guessing, then you do need to ask yourself whether you were actually hearing a difference.

So that is my reply to speedbump. Yes all that matters is whether you hear a difference but to know that definitively you must ascertain whether you are actually hearing a difference as opposed to just thinking you hear a difference.  At the end of the day it’s your money and you can do what you want with it and that’s fine.  
Oh that said, I have no objection to trying it for myself, And I will as soon as I get my listening room finished. and I will as soon as I get my listening room finished.  Though I don’t have well trained ears and so I don’t know whether I would hear a difference from a lot of things.  

I like where this is going, and look forward to @lostinseattle follow up on his testing...I credit the dedication to do and share this