Instead of looking for somebody's else's proof on how power cables work or not. Create your own proof. Best way to know for sure? At it would be really cool if others were there to check out you findings? Get multiple posts from other head-fiers. That would be cool!
If you tried to "create your own proof" about the moon illusion not being an illusion, because you believed it truly looks bigger near the horizon, and asked fellow "creators of their own proofs" to share with you the results of said own proofs, how do you think that will turn out? How much closer to the truth do you think you'll get that way?
Obviously, you are not getting it.
Believing that the "best way to know for sure" is to check for yourself, just listening, with your own sensory and cognitive machinery and their limitations and biases, and with no proper methodology, and to check with fellow uncritical believers, is at the very core of the problem.
You will not be proving absolutely anything that way. You are just proceeding in a way to make it easy for your biases and beliefs to be confirmed, to keep believing whatever you already believe, or to validate what you want to believe. It's not a way to truly test a claim in an objective and unattached, unbiased manner.
What you suggest is actually the worst possible way to truly test the matter at stake.