Does anyone know where I can change the crossover for this receiver? I've searched and searched but found nothing. I have the YHT-270 HTIB setup, and while the bass has awesome "rumbling", I seem to be missing the mid-bass range. Granted with these small speakers that is to be expected some, but I'm wondering if I can change the crossover anywhere to send more of the mid-bass to the sub. And yes, I do have the speakers set to "small", and the bass set to "swfr" and not "both". Any help would be greatly appreciated.