Let's talk power cords

It does make a difference although not perhaps in the way cable companies may advertise.  Generally a heavier gauge power cable will provide a better perceived response than a smaller gauge in a power amplifier with a higher power demand. You can buy 12ga power cords at Home Depot and terminate the amplifier side with a proper three prong socket- if you know what you're doing, and wind up with satisfactory results. I have and I did.

Almost all new amplifiers use solid state rectifiers that allow electricity through in bursts so even if your power consumption is 400 watts as a steady state, in the moments power is pulled to charge the power supply caps it may be drawing much more.  A heavier wire will deal with this better than a lower gauge wire which is why appliances spec an amperage rating, as do power cables.

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.