Hi, I have a sony str-db930 and I think it needs to be grounded, However i'm not sure on the best way. I have heard a few things but want to know for sure before I do it. Can I connect it to the earth on a mains plug or not ?? The manual says to earth from the am loop and not the signal ground as it is for a turntable earth. See link for a piccy of amp connectios noting the eart signal and earl sighn on the antenna loop connector. http://www.homecinemachoice.com/testbench/Amplifiers/Sony/SonySTR-DB930.shtml Click on piccy of rear to get large one Thanks in advance Kevin.