In my experience anyone even blind could tell when I move the AC from my UPS to the regular mains ... Not a scientific study mind you... In term of measurements my AC was extremely pure, more so than any mains from any country one would care to think. Simply because it was re-generated a solution which I mentioned in my post.
We share this view on the effect of power supply - but in my system every one could also listen to the difference between direct connection on the original ARC power cords and the system connected with all Shunyata Andromeda power cables with an Hydra8 distributor. And it is not small.
But my question still remains - if we both see that mains quality affects sound reproduction, why thousands of talented equipment designers can not built a power supply immune to power supply "impurity"?