I’m 100% sure that people who perceive a difference with PPT products, esoteric power cables, fuse orientation etc are human.
They are not robots typing in the forum.
As humans they are susceptible to placebo effect, and can not possibly prove causation for how they feel or what they hear. It’s real to them, and regardless of whether it’s logical, silly or breaking the rules of physics, you can’t deny their perception.
This DOES NOT mean that the audio tweeks are the reason they feel or hear a difference.
If you guys enjoy the mental masturbation of discussing whether it’s placebo or not, have at it. But that is essentially the discussion. You can not possibly prove either way, so it’s ultimately silly to insist the difference you hear is “real”, just as it’s silly for someone to say there can’t be a difference. There can be a difference for reasons independent of the tweek, and it’s real to the person who perceived it.