I really don’t understand.
Big manufacturers build and sell very expensive power cables.
No government supervision? No one check ?
Correct. Many of these companies are just selling overpriced cr@p by preying on the insecurity of people that think they can get that last 1% of better sound quality. Companies like Nordost, Fraudioquest, PS Audio, ...my god there are simply way too many to list...
And yes... if you look, they are not signed off by UL or any other agency.
Go read some reviews on ASR. They had a product from PS Audio that almost electrocuted Amir! He took it apart to inspect and found the ground wire was LIVE and carrying current!
Like I said, most of this is absolute bunk. Quantum Tunneling and battery packs on cables and directional cables...
It's all made up to justify a false narrative.
Electrons just need a good conductor. They don't need to be massaged by vestal virgins with rare whiskeys, fed fioe gras, or have some cosmic pixie dust taped up in little ziploc baggies and stuck to the cable to work properly.
I think it's time to drop some Roger Russell. He was the director of research for quite a while... at McIntosh Labs. Please read and digest.