Are ferrites effective for cabling?

Thanks for the more appropriate answer, but kudos to tooblue's sense of humor ;-)  I have a Tice Signature III(b) so I have the noise from the house eliminated, but I'm wondering about what may creep in through the unavoidable tangle of cords that I have unfortunately amassed behind the entertainment center.  I have a couple different sizes and have a couple on cables like the coax coming from the satellite and and an interconnect or two, but wonder if they help with or detract from from the signalling?

Thanks everyone for your comments so far, at least the germane ones.  As I suspected is the case with this topic (and most of the others) there is a whirlwind of opinions, both good and bad.  What I am gathering is that there is at least a possibility that they can help a little with noise.  I have a very minute amount of hiss coming from the speakers (I have to put my ear almost literally on the speaker grills to hear it) but the AC hum has been eliminated with the Tice.  I have no problem with a little experimentation, shoot, I did it throughout high school and college, so why not, right? ;-)

Alright, geoff, that begs the question is there a way to eliminate hiss from the signal path?  I probably should have started with that question, my apologies.