I can't get anyone to respond at AVS! I cannot tell if their is something wrong with my Panny XR50. I called Panasonic and they do not have a clue. The receiver is in DTS NEO 6 mode and using an optical signal from dish (PCM). If I set the speakers to large then there is no sound from the subwoofer. I set the mains to large and the sub still works. When i change the center and/or the surrounds to large--no sub. In NEO 6 i can only run the mains on large and use the sub. Is this normal? In the same config. (all large) I can use PLII and hear the sub. In Neo 6, no sub with any speaker config, except the mains, set to large. I don't plan on running all the speakers on large, but if there is a problem i would exchange the receiver.