I sorta inherited some Bose Accoustimass speakers. I have 3 of the cube speakers, and I ordered a forth. I set them up as Right F, Left F, Right R, left R. The fronts work fine, but I'm not getting anything out of the rears. When received the forth cube, it they should be connected to the Accoustimass box, and Not my AVR. Could this be my problem with my rears? I dont have the Accoustimast base box. Long story short, my dad was storing these in his garage, he gave me the cubes, the base box was in his garage and Katrina wiped out his garage... Any advice or suggestions would be greatly appreciated. Thanks!