Humn is a common symptom with home theater systems, usually cuased by multiple grounds. The first thing to try is to "cheat" the ground on the sub. Get a three-prong to two-prong ac power plug adapter, which is commonly available at any hardware store of Rat Shacks. If that eliminates the humn, great. if not, it may be the Cable TV feed that is causing the problem. In that case, you have to find a "dc-blocker" or "ground isolater", which is a little device that connects in line with your cable feed. If neither of these solve the problem, then we are in trouble. Lastly, the reason the humn is coming from the surrounds is because of the Dolby processing, which is assuming that the humn is part of the rear channel. (the rear channel is decoded as the left minus the right main channels, thus any random noise will decoded at rear channel info). GOOD LUCK.
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