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i think its kinda related to what i learned back in my car stereo days about using multiple grounding points and the noise they can cause . a single common grounding point (star ground) was the prefered method . many guys that kept grounding here and there and everywhere created a lot of problems (ground loop) before they finally got a good/real ground but all the crap grounds left in place added noise . the moral of the story back then was if you had one good solid ground point that you didnt need the others . ground is ground , either you have it or you dont .


heres some info on ground loops thats focused on rf/radio gear and not car stereo stuff .

http://www.k0bg.com/loops.html

http://www.eham.net/articles/16830