At least i want to believe ear drums being flesh vibrate differently than non organic materials, cells squeeze and contract. The shape of the ear drum is different and the electric signal in the human body is different than electronic devices. It’s just a tiny tiny amount in a human. higher voltages like outside the body change and shape the sound a bit or cause distortions of certain wavelengths of the sound. Just my general idea. I had an ex girlfriend who had a wind up shortwave radio and if using it wound up instead of plugged in to AC or battery she could hold a signal on to a weak station. And no matter the power of the other stations there was less static and distortions on easy to get broadcast or hard to get broadcast. This was just a pocket radio. The flow of electricity is different between those method ac vs dc. Was the kind that winded down as you use it. Power is more stable during wind up or something. I could be a little bit wrong on the radio part because i would have to have my ex girlfriend show me again and no way am i going to go talk to her after over 15 years.