Bridgman,
The 5790 definitly distinguishes between small and large. I've just never examined what frequencies it does not send to small and whether that is determined by the crossover point that defines LFE. It definitely allows you to send low frequency signal (as defined by the specified crossover) to the sub, fronts, or both. So if It only gives me one, then I have to use the subs X-over as well. Any thoughts about speaker selection?