it's copper, physics of copper doesn't change with the small current that runs through cables. It's your ears, your brain, that gets tailored to the sound...Pure BS! And a 3-foot piece of copper or silver isn't going to provide better current to your equipment either...That is just ridiculous to think one foot of anything at the end of a 100 foot run of romax is going to improve your electic supply somehow...but spend away..