Let's talk power cords

Yes they do. Unbeliveable, huge difference.
I did not believe it myself until I tried to make a cheap DIY power cable.
it improved the sound a lot compared to the standard 2$ power cable.
That was 4-5 years ago. Since then, I built more than 20 of them.
The last cables were made with expensive materials, gold or silver plated OCC copper and Neotech plugs. They sound amazing.
It is definitely worth the money and it has brought a huge upgrade to my system.
Everyone should try for themselves and listen.

There are those who have tried high quality power cords and those who have not. Those who are the proponents of high quality power cords have tried them. Those who have not tried them, somehow, do not want them to exist. 

Before I tried a high quality cord in my system I was deeply skeptical. 
Still, and this is the most important fact, it cannot be determined that a cord will or will not produce a positive impact to the sound of your system until you actually try one in your system. 

Any cable must be put into your system and the system must be played to make any determination. Otherwise only speculation can be applied. Proof is useful, speculation is not.

Suggest: go to the lending library at  THECABLECOMPANY.COM

Also see JPSLABS.COM

" Those who have not tried them, somehow, do not want them to exist"
+1 / Well stated sc4a

I think power cables can make a difference, but it depends on the component. For example, I've heard no difference with power cables on my Sanders Magtech but heard big differences on my brother's McCormack amp.

Perhaps more then 15 years ago I bought Harman Kardon receiver for my home theater. It was humming with sensitive speakers, and problem was acknowledged by company as a design issue. They sent 2 chokers to put on power cord and it somehow helped, albeit later they replaced power supply anyway.
Since then I never heard in my system any effect of power cords on any of my systems. I never tried 20K ones - but I tried PS audio, Shiniata, Pangea and Signal Cables. None of them to my ears caused any change. Now I use Signal Cables around as they are well made and inexpensive -but honestly I could not hear any difference.
Same with speaker cables - blessed with friend as neighbor who was constantly experimenting I tried several. Nada, regardless of amp and speaker. My last change probably an exception, from "borrowed for free" Nordost (not the most expensive one) to Canare 4S11 (I moved and had to return Nordost), which I bought on Amazon for less then 50 backs each (good looking and terminated) was the only one I could heard some difference, with Canare getting an upper hand. Probably.
Interconnects I could hear the difference, slight, but audible. With sound getting less pleasing with price going up - one silver cable was especially brutal. I left with inexpensive MIT cables as the most neutral and later changed them to bluejeans - without any audible effect to my ears.
At the same time I can easily hear the difference between speakers (of course), amps, preamps, dacs and even digital transports (I was shocked for example how much better Auralic Aries Femto sound was compared to OPPO 105 digital output using the same media server and DAC).

Is it possible that some of us "cable sensitive" and others are "cable deaf"? I clearly in the second group.