Can a better power cable make a difference if NOT plugged directly into an outlet?

I’m impressed with those with the ears, discrimination, money and time to test each component comparing various power cords. My approach was to stay with the latest technology from a major power equipment manufacturer. I bought into the idea that conditioner/PCs were designed as a system. I wanted all components, except turntable motor to be within the system. I also wanted the conditioner to be able to provide large amounts of current for short periods of time. I went with Shunyata. I did play with various cables within their line, but all cables plugged into conditioner were NR. I have no idea as to the validity of my approach, but it made sense to me. I purchased everything with a no questions ask return policy, and I did use returns to upgrade my cable. My attention to power was one of the largest improvements that I’ve made to date on my system.

Given the major improvement that resulted from the full system, single manufacturer approach, I have concluded that many people that have tried cables, but found little success have failed because of their lack of attention to each aspect from wall to the power supply of each and every component. Based upon my experience, as I went up the Shunyata line of cables, I believe that another aspect that has resulted in many people failing to find improvement from cable selection is their unwillingness to spend large amounts of money on electrical cables and conditioners, so when they test they do so with lower level components.

Years ago I bought JPS  Labs pcs for my components that were plugged into a power conditioner just hoping they would do something positive. They did make for a quieter background. Then a few years ago I upgraded to TWL on the digital components. The preamp doesn't change no matter what cord is used.But boy the amp responds significantly to changes in pcs.IMO they do make a positive difference

@gladmo You misspelled "common sense".

@lalitk You must be a dream customer for a saleman.

To explain my comment, the pangea has everything I look for in a power cable, but it can usually be found for less.   

You want to expain what features you look for in a power cord that are so obviously superior?

All good purity cables, if properly insulated and wound, will enhance the sound quality no matter where you are in the chain.  They help to properly align and pace the electrons passing through.  At least I think that's what Henry Kloss said.