whoops, what I meant is that it sure seemed like there was more bass with large and LFE+main than just small and LFE (with a crossover).
I think I will do a little experiment.
I'll put my receiver on large and LFE+main, with a 80 hz crossover.
I will unplug the sub (or turn it all the way down) and play some low test tones (35 or 40 hz) and see if I hear anything.
If I hear something out of the mains then the sounds are obviously not being cut off.
I suspect I will hear something with the setting on large and lfe+main, but nothing on small and lfe.
I am not saying I am correct- I just really can't imagine the lfe+main setting being available for no reason.