Jensen makes a nice little product that can remove 60Hz ground loop hum from cable systems. This will not work with satellite systems. http://www.jensen-transformers.com/datashts/vrd1ff.pdf
Here is an interesting product that can eliminate ground loops without lifting the electrical ground. http://www.ebtechaudio.com/humxdes.html Note: this product has a 6 amp capacity limit. This is another product that can be used in the line from your preamp or receiver to a subwoofer to solve the problem. DTI Ground Loop Eliminator
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