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There are three main ground problems that cause problems in an audio / video system. These are ground loops, improper grounding and lack of a ground altogether. The other possible culprits that can cause noise are bad cables, a faulty piece of equipment or electrical noise from a lighting dimmer or electric motor. If the noise stops, connect them back to the receiver or processor on at a time until the noise returns.

If the noise is caused by a cable box, the noise is likely caused by the cable TV ground. If the noise is eliminated by disconnecting the TV cable, the problem is the cable TV ground. You can electrically decouple the cable TV feed from your system with a ground breaking transformer. A difference in resistance to ground from one ground point to another can cause the dreaded ground loop. If you get a ground loop, current flows between the two components. If the current flows through the components internal audio signal ground, you will get a hum.

Sometimes power conditioners will stop noise problems by placing equipment on different, electrically isolated outlets.

You can solve most noise problems in your home theater or multi room audio/video system by taking the systematic, step-by-step approach. If you have nothing connected to your speakers except the speaker wiring, and they still hum, the problem is noise induced into the speaker wiring from adjacent power cables.

Eliminating that Terrible Hum From Your Home Theater Speakers

Noise sensors are also a great device to own. A Lowe’s home security system is a great choice for any home’s protection.