There's always the argument that scientific knowledge isn't fixed and that we don't know everything and that therefore it is possible that there are types of distortion, or complex wave interactions that cannot be measured with current equipment, but that show up as artifacts to the human ear.

Which is why people buy into various products that either make unsubstantiated claims, or claims based on pseudoscience or just plain bull shiitake.

Kind of like trying to argue with someone over whether aliens have visited earth. You can make the arguments about theory of relativity and how mass can't even begin to approach speed of light, let alone go faster, but the believer will always come back with, "yeah, but how do you know that there isn't some phenomenon or technology that will allow us to do that, but that we haven't discovered yet?"

Anyhow, my point is that it's very difficult to disprove that which is beyond knowledge...which a lot of these types of claims are.