My Setup is as follows:
My center is hardwired to my Yamaha receiver. My fronts and surrounds are powered wirelessly by the Rocketfish Wireless Audio HD kit from Best Buy. Blasphemous I know, but I have my A/V equipment on a corner fireplace and don't want speaker wire running down my wall.
I recently acquired a PSW350 subwoofer that I want to incorporate that I will have to cross/over with either one of my front or rear speakers. My front's already have 6.5" powered subs so I didn't know if that would be redundant, but I also don't know if rear speakers carry a lot of LFE that would make use of a powered sub....