@holmz-
Bear with me a minute, in my folly, far as a possibility on why a power cord might make a difference.
Based on some of the theories on how electricity works, simplified:
The conductor acts as a waveguide for the signal/voltage.
Within the conductor: when excited by an AC current, electrons oscillate, generating photons/electromagnetic waves that travel, always from the source, to the load.
Keep in mind: all signals (ie: music, AC) are sinusoidal waves
Those photons/electromagnetic waves travel through and outside the dielectric, which (according to it's permittivity/Poynting vectors) will have various effects on those waves. One of the most obvious, is the dielectric's effect on the speed of the signal.
The better designers of printed circuit boards, even take the above into account, when choosing materials for their products.
I posted a link on the first page, that included data on the manufacture of semiconductor chips and what was observed when materials were cryo'd, during process. Short version: better contact/lowered resistance between layers.
Under the scanning microscope: much smoother surfaces observed.
I would hope, by now, it's a given that various cable constructions, twists, braids, etc, can make for a cleaner transmission of signals (ie: Litz, etc).
Just seems to me (a hypothesis): given the above (some theories and some things established/measured/proven), it's not a big stretch to believe a power cord, built of the best conductor (Ohno CC silver), wrapped in a very low dielectric coefficient dielectric (ie: Teflon), cryo'd for the smoothest transfer of those photons/magnetic waves and twisted in some crazy way, might not smooth out some of preturbations/noise, from the crap an AC waveform had to go through, back to it's generator. (run-on, much?)
I haven't tested this, actually comparing two circuits, but: it wouldn't surprise me, if a power supply that used a choke, would be less affected by a better power cord, as the former can eliminate a lot of the high freq garbage, etc, that's either created by, or makes it through all the big converting/filtering stuff, before.
Never thought about PCs before the good stuff hit the market, but: the Physics/QED made sense.
I tried 'em, I like 'em and the science makes my head feel better.
Don't care WHAT it does to anyone else's!
