Subwoofer hum is a low-level noise that is present whenever the subwoofer is turned on, regardless if it is playing. It is usually a 60Hz or 60-cycle hum that is simple to correct by changing the way the subwoofer is connected to the AC wall outlet. Try the two methods below to diagnose and eliminate subwoofer hum.
Difficulty: Easy
Time Required: 15 minutes
Here's How:
- Change the polarity of the subwoofer's connection to the wall outlet by reversing the plug. If the subwoofer plug has one prong that is wider than the other, try reversing the polarity by using an AC ground adapter, available at any home improvement store.
- Sometimes the hum is caused by a ground loop, which can be eliminated by plugging in the subwoofer to another AC circuit in the room. If necessary, use an extension cord and plug the subwoofer into a wall outlet that is separate from the rest of the stereo system.
What You Need
- AC Ground Adapter
- Extension Cord