Hello,

This sounds like you are experiencing the dreaded ground loop. A quick way to try to eliminate the hum without any troubleshooting is simply by attaching a 3-2 prong adapter also known as a cheater plug to the end of subwoofer power cable. Just remember this is usually against electrical code and is not meant to be used as a permanent solution. The article below describes the steps needed in order to solve what component is causing the hum and how to get rid of the hum completely. The key to solving ground loops is being patient and methodical in the process.

http://www.axiomaudio.com/tips_eliminate_hum.html

I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne