powercords

Agree with proof of concept. Personally, I have found premium cables to provide blacker backgrounds and quieter quiet parts between the notes. Overall as improvement. But I also feel that there are economies of scale. I started out my power cord journey from stock cables to Shunyata Venoms. Then I upgraded to Deltas. I think that is going to be it for me. The incremental benefit of a further upgrade combined with my hearing, components and room make me feel like I have hit the sweet spot already. Ad in there my PS Audio power regenerators and dedicated 20amp lines from my breaker box and I am good. My systems are quiet, black with good resolution. I noticed the difference initially going from stock to Venoms. I feel that it is real. 

Zappa it too.

Following advice in this forum, I ventured into my first aftermarket cable being the Synergistic Research Master Coupler X2. There was a noticeable improvement, much the same as kingbarbuda describes that he perceived in his system.

I have just paid for a Grover Huffman Pharaoh power cable, and I'm waiting to take delivery. It comes with a trial and money back offer as well.

my experience with power cords has been ok. I bought the 12 + from Triode audio lab for my Conus Magnum integrated. This are not the top of the line. the difference was some what noticeable in terms of energy from voices and other instruments. just like if you gain a few more watts to your system. The issue I have with after markets inter connects and power cables is that they have an initial impression and when you get aclamaited to them you  don't notice or forget them. Don't get me wrong I still believe we should continue to strive for that perfect nirvana sound we all want. Its just that spending thousands of dollars in cables is not the way to go. its the pre amp, amp, cartridge speakers that has the most noticeable and lasting improvement to your ear. Just my 2 budget conscious 2 cents. but I agree experiment and let your ears make the  decision.

I can say that I upgraded my whole system in Nordost Frey2 power cables along with a QX4 and QBase8 and it has made a significant difference in my sound. No question. 
I started with stock, went to Red Dawn and then graduated to Frey2. I don’t understand the argument against improving the power cables. If you don’t want to spend the money that is one thing. But trying to convince anyone that better power cables don’t work is a real losing argument. The balance between improvement and cost is an individuals choice. They work!