I just purchased the Swan R3 bi-di-pole surround speaker for my home theater. How does a bi-di-pole differ from a dipole or bipole speaker? Now I'm worried if I bought the wrong speakers, because they will have to be placed on the wall directly above my couch, which is against the wall. Should I cancel my order and buy different surrounds? Or can I just aim the speakers downward to fix the problem? Help!