I live in a old ( ca. 1942) duplex whose power is supplied by a 60amp fuse box. I was poking around the fuse box the other day and noticed that it wasn't grounded, but my neighbors was. Being the dummy I am, I decided to ground the fuse box. I bought a few grounding clamps and attached a 12gauge copper wire from the rod the white wires are attached to a metal pipe (the neighbor's fuse box is grounded the same way, and a satelite cable is also grounded to the same metal pipe). The wiring in my house is all two wire copper wire. There is no ground cable in the house's electrical wiring... I turned the electricty back on, everythings good, but now I have a very slight hum from my speakers. A few weeks ago I was running more speaker wire under the house for my new 7.1 set-up and I also grounded the outlet that feeds my HT. I crawled under the house and ran a copper wire from the power outlet and attached it to a grounding clamp that I attached to a water pipe. What should I do to eliminate the ground loop? Disconnect the ground to the power outlet feeding the HT, or disconnect the gound at the fuse box? Does grounding the outlet but not the fuse box actually do anything?