I have a new pair of Polk Dipole surrounds that are very nice and I'd like to use them in my new home, however, they are black and would really take away from the appearance of my new home's walls. I was wondering whether it would be a terrible idea to paint them? I realize that most of the problem would be with the felt covers because it would interfere with the design and function of the speakers. But how bad would it be? I am afraid it'd be like hearing the speakers behind a paper bag... Is there any way to have the felt replaced? Thanks for any advice or help.