I'm not sure if this guy even realizes what a clown he sounds like. He keeps saying to not kill the messenger, he's ONLY the messenger.... Then he says crap like "I'm SURE these cables will improve the sound!" - That's no longer being the messenger. He's a cable pimp. He prostitutes out disease ridden high dollar cables and claims he's just the middleman in the transaction.
Nope, he's the sucker with multi-hundred thousand dollar speakers who is hocking his BS to the masses without a single piece of test equipment in sight. Yeah, just some basic metering would be a basic starting point. This is why I like channels like Linus Tech Tips where they start by saying "This sounds ridiculous..." and then they actually test things and typically prove that ridiculous is exactly the case, then TELL people their money is better spent elsewhere. Wish this guy had the guts to do the same.