powercords

@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 am curious where people found fault with the video that Paul77e posted.  It seemed to me to be a reasoned argument, based on science, amplifier design, and hands on experience.

I am not an audio designer, electrician or physicist, but I did work in electrical manufacturing of power regulating equipment for some years, and I am hard pressed to imagine how a power cable upgrade could make a difference to sound, so long as it is capable of carrying sufficient current.  And even if you were pushing enough current through it to create resistance, isn't the worst result just a (very) slight voltage drop?

The whole thing about DIY cables using silver wire and hospital grade plugs seems silly.  Hospital grade plugs are simply more robust to handle greater physical force from pulling, and have a little more insulation to prevent contact shock.  And what possible difference could four feet of silver wire between the outlet and the component make when everything else from the generation source to the outlet is copper?  It's not as though the electricity magically starts at the wall.

If folks hear a difference, great.  That's all that really matters.  But honestly, how many who heard a difference did a real double blind test?

I would suggest that power quality is a much bigger issue for all electrical equipment, including audio.  Most PQ problems are voltage related, and most of those are sags.  Even a very short duration sag can mess with electrical equipment, especially digital switches and power supplies.  Installing a real voltage regulator (very expensive) or a UPS that puts out perfect sine wave power would be a good investment.

One question that I posed actually has not been answered in this thread, which is how would a power cord make a difference? I mean theoretically speaking. Would it not have to change the characteristic of electricity between the outlet itself and the component, and if so what characteristic is it changing? 
Running a cable the entire distance between the source and the recipient, such as from the CD player to a preamp, or an amplifier and speakers is one thing. But claiming that a small bit of cable tacked on the end of miles of a different cable can change-profoundly- electricity is something else.  What exactly is being changed?