@schubert
Of course the last few feet can filter power and improve performance of SOTA equipment - no flat earth or right wing nuts deny that. However, so can the power cord and power supply in the SOTA equipment. It is reasonable to expect an improvement with a power filter for cheap crap gear but why is it unreasonable to expect SOTA equipment designers to build an adequately filtered power supply to begin with?
What is is wrong with the knowledge of SOTA designers? Do they ALL only know how to build amplifier sections of electronics and were ALL asleep during the power supply design training course?
I will not resort to personal attacks like you, Geoff, nonoise and Rodman as it kind of looks very much like a right wing nut would behave when you attack people rather than address the point.
Why are SOTA designers so bad at designing power supplies?