dopplermhz80
Member
I have read a few different things about isolated ground systems and was looking for someone with real knowledge to set me straight. I recently installed a subwoofer and amplifier for my home theater. I have a terrible hum from the speakers when there is nothing on except for the amplifier. So I have read about the ground isolation. I have plastic boxes in my house. So I cannot ground the recept. box to the breaker ground bar. I could only run a 14/2 NM. The copper went straight back to the breaker ground. I still had a hum. I guess my question is... Do I have to have a metal receptacle box and 14/3 wire in order to lose the hum? Is an earth grounding rod a good idea? Any suggestions would be greatly appreciated.