I have been told that due to sub-woofers non directional sound they can be placed almost anywhere. I have have even heard of people placing them in sub-floors under their house and in their attic. I also know that at the movie theater, often times that subwoofers are placed behind the wall under where the screen is located. I am considering placing my sub-woofer (a self-powered 12" Infinity) in a closet that is about 3 ft from where my components, center speaker and TV are located. It would be completely hidden and still very close to my system. It would also be separated by one wall. Has anyone set up their system similar to this, or have knowledge of this type setup.