Klipsch SW-10 FM station bleeding through-Help

 When my Sub is powered on with the cable running to my Denon 3808ci and also happened with old receiver, I can hear a local FM (105.5) bleeding through on my sub. It is very noticable on quite tracks while watching TV or Movies. Even if I unplug the cable at the amp it is still there. If I unplug it at the sub it goes away. I have managed to reduce it somewht by attaching a couple of capacitors to various positions on the sub. Any Ideas to eliminate this would be greatly appreciated.


Thanks