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This is the bane of all home theater installations and its called the "60 Hertz Hum" Most likely coming from your cable company.. Simple test... Disconnect any Coax cables from the outside going into your cable box or tv. Hum disappears. Most likely this is caused by a "ground loop" problem.
The solutions are far and varied. Google "ground loop hum" to find different things to try
Replace the plug, they most likely had a ground loop where it was plugged in and cut the common to get rid of noise. Replacement ends are easy to find at Home Depot, Lowes, ACE, etc. Try that first, if you still have an issue, post a comment and I can help you further. Hope this helps
There is actually some good news. I had this problem with my PB10s (1 have 2 PB10s and 2 PB12s) It is one of 2 things, the first is that it could be a capacitor and resister combination on the amplifier board (which was the fix for our PB10 with the same problem), or 2nd, the AMP IC, which is not available for the PB12. hmmm