from that link
Every audiophile who has experimented with better power cables has heard the performance advantage they offer. Indeed, the amount of improvement can be astounding, often transforming a system from good to amazing. As audiophiles, we trust our ears but it’s hard to understand how replacing just one short link in a long chain of the power delivery system can have such a dramatic impact. The following article is intended to answer those questions
Note the bits in bold.
Now here is an ABX test where they had to try to distinguish between Nordost power cables and some standard leads supplied with some Parasound amps.
https://hometheaterhifi.com/volume_1...s-12-2004.html
No-one scored better than random chance.
It is clear from the above analysis that no matter what background or experience a participant brought to the test, it did not help him or her score better than anyone else. 49% accuracy is 49% accuracy.
But the amount of improvement can be astounding!
Unless you don't know if the fancy power cord is in use or not. Then it doesn't sound any different.
Now it is an ABX test so it is not a 'normal' listening environment. But even so you'd expect an 'astonishing improvement' to be fairly easy to spot in pretty much any circumstances.
But no-one seems to be capable of doing it.
There was also a home test done on Hi-fi Wigwam back in about 2004 where the cables were sent to peoples' homes so they could swap about at their leisure. The cables were disguised so that it was not possible to tell the fancy leads from the standard ones.
Unsurprisingly people claimed to hear clear differences even between identical power leads. Sadly the pages documenting this have been deleted from the site. I don't know why this would be, except perhaps because the site hosts many adverts for fancy power cables.
if the people making the fancy power cables really have made amazing new discoveries in electrical theory how come they are not stepping forward for their Nobel prizes?
There is an enormous credibility gap here people, and I for one am not going to attempt to jump it.