I was blown away. I have heard a difference form a stock cord to just one very high end power cord. On an highly optimized system and the difference was substantial.
In addition my power cord theory was at least supported by the same author
" From the perspective of your audio components, the AC cord isn’t the last few feet of a transmission system, but the first few feet. The AC cord is directly connected to the primary windings in the power transformer of your audio component"
That’s the only thing that could make sense to me is that the power cord is an extension of the component not simply an "extension cord".
Also mentioned in the chapter was replacing all the cords as every component adds its own interference and you might not get the affect with only changing one.
My experience with replacing cords was positive but I only have two components an integrated amp and a DAC. The other side of that is I I’m really cheap (I mean really cheap). I purchased two Chinese power cords that were cheaper than buying the plugs and building them myself. What was important to me was wire gauge. The cords are rated at 10AWG. If I’d seen the 8AWG cables prior to that I probably would paid more for the extra conductivity.
Again my thoughts on cables were supported by the author for better plugs and increased wire gauge.
" Good AC power-cord design minimizes the noise coupling between components described earlier, and ensures maximum instantaneous current delivery."
The cheapo 10AWG Amazon cables seem to make playback quieter and increased bass response. I’m not able to rewire my house but I’m currently using my sons power conditioner which may or may not have improved the sound but it gave me more plugs for all the other stuff and didn’t degrade the sound.
The cheapo that I am I trying to find a used medical grade power conditioner with enough amps to support my equipment. It’s out there in my price range hunting is the fun part.
I agree with your concept of sound per dollar. Is my system perfect? Nope never will be. For the money I have invested (not counting the myriad of amps, speakers and stuff to get here) is there another system that can touch it? I really don’t know don’t care. By doing a lot of research, listening to a lot of stuff doing a huge amount of comparison, for the first time in the 40 odd years I’ve been working with stereo I’m happy with the sound. With that foundation I can now work on tweaks.
I apologize for the novel but hopefully ... what was your question again?