For the life of me, I can't figure this out, and Yamaha's owners manual is pretty vague. So here goes. If I have the option of changing the crossover point, whether my speakers are set to small or large, then what's the point of setting them to small or large? For example, if I set the crossover to 80hz, then won't all the bass that's sent to the 5 main channels that is below 80hz get sent to the sub along with the LFE? What exactly does changing the setting do? It's somewhat confusing.