The electrical hum isn't from the electricity at all.

One explanation for the hum heard near transformers is that at low frequencies, like 60 Hz, the transformer core undergoes magnetetostriction. Magnetetostriction is the slight change in a ...

I just got the latest Hifi News magazine and, as usual, the same ridiculously expensive mains cables etc are being pimped. I usually just skim over that crap, after admiring how pretty it is, but this ...