I get a loud “hum” through my Audiosource powered subwoofer. What could be the problem?
In most cases, if you hear audio program along with the “hum” through the subwoofer, there is probably a “ground loop” problem in your system. This can usually be remedied with one of the following solutions: Make certain that both the receiver and subwoofer are plugged into outlets that share a common circuit breaker. Temporarily disconnect the coaxial cable (Cable TV, Satellite connection) that is coming in from the outside. In many cases there is a weak ground present which can cause noise. If the noise is gone when the cable is disconnected, your cable service is probably not equipped with a grounding block. A coaxial grounding block can be purchased from a local electronics store. Temporarily run a small wire between the chassis metal of your source unit to the chassis metal on the rear panel of the subwoofer. If this alleviates the noise, you can run a permanent wire between the receiver and the subwoofer amplifier, connected to a chassis screw on each unit. Many receivers have a
