Logic 7 and DLPIIx are similar but different. Yes, both will get information to come from the rear speakers, but the Logic 7, as I understand it, plays more like Neo 6 from DTS. (Please feel free to correct me if I'm worong on this - I'm not a Logic 7 user). That is, it plays a mono rear surround. The DLPIIx plays a stereo rear surround and can do so with a 2 channel or a 5.1 or 4.0 signal.