It's out there ,search for it.But even with a Doctor you get different results or opinions all the time.Just look at the justice system....you gave Doctors for or against a Client and then 12 people who are not qualified to make the judgment...
Scientists studying how current really moves through wires and other objects.
Not directly related to a specific piece of equipment, but I see potential in the research for the Audiophile World if some of their theories pan out!
https://phys.org/news/2020-07-diamonds-hidden-currents-graphene.html
https://phys.org/news/2020-07-diamonds-hidden-currents-graphene.html