I am new to the world of home theater. I am looking for a decent not high end not low end system. I NEED the back speakers to be wireless. I have read that the Samsung HT-Z520 is wireless but I have also read that people say Be aware that you still need to run wires from the rear speakers to the wireless module, and that module requires power. What does this mean? I desperately need wireless rear speakers and something under $400. Thanks!