Hum Elimnator
The Hum Eliminator™ is designed to eliminate 60 cycle hum (60Hz AC signal) caused by Ground Loops. It is also designed to convert unbalanced lines to true balanced lines (and vice versa). Why? Unbalanced lines are more susceptible to picking up electrical noise and RF interference.
If you've ever seen an electric guitar, you'll have noticed that most of them have thin, solid bodies often made out of plastic. Resonance isn't at work here: electric guitars produce their sound through an entirely different process. In fact, even though acoustic and electric guitars look similar, and you play them in a broadly similar way, they are quite different instruments. Electric guitars actually have more in common with bicycles than with acoustic guitars!