From what I understood from Jays utube video was when the power correction switch was engaged that he heard the buzzing from his speakers ...
Jay used to have a thread here and a few users and myself figured out he had some pretty big problems with his AC lines. He couldn't imagine that his electrician got it wrong and left A'gon got in quite a huff.
I actually think Jay is probably a pretty good guy. But, like a lot of these YT "influencers," he thinks he's beyond reproach. They're just not a reliable source of information - consider that their whole premise is built on lossy audio. That makes no sense, but I guess they provide drama and "excitement" of the vicarious sort.