Also from the above cited Stereophile article: "At AudioQuest, we reverse-engineered every premium-audiophile power receptacle we could find. Some were substantially better than average (a few [were] actually worse), but what I saw too often was cryogenic freezing, or rhodium plating over a mostly stock design that simply wasn't up to par. I decided to not only use beryllium copper base metal for its high spring strength, but all metal parts are up to 40% thicker than a typical NEMA or hospital grade AC receptacle. The only plating is thick, direct silver using what's called the 'hanging' plating process. This assures that induced radio-frequency noise has a low-impedance path back to the electrical panel and Earth ground. Further, it's low-impedance at radio frequencies. The plating covers all modes: Line, Neutral, and Ground. Many premium power receptacles do not. For audio-video performance, details count. Noise-dissipation is a drainage system, and we do not want a power receptacle to interfere with the drain path back to earth. Additionally, a typical power amplifier can require instantaneous transient current as high as 70 amps peak. The lower the impedance of the wall connection, the better the delivery of the transient current. [There's] less current compression."
I am a mechanical engineer, not an EE. But this entire paragraph seems to transcend nonsense and approach gibberish. My favorite was his assertion that "a few" of the premium audiophile power receptacles are "actually worse" than average. I would expect about half of them to be worse than average.