I just built a new computer system and all is well except my speaker system.<BR><BR>The subwoofer of the Altec Lansing AVS300 system has a loud hum. The subwoofer is not shielded so I set it 3 feet ...

I have two seperate power amplifiers with 3 prong chords. When I connect the amp to the speakers I hear a noticable hum/buzz that comes through although when I play music at low volumes, its not ...