If you ask Cinematic-systems, he'd tell ya you not only need separate 1000 watt Bolder mono's for each driver in your speaker system, but would likely asume you to be an idiot for not agreeing...just incase you were curious.
Other than that, I find multi-channel amps to do quite well for most peoples home theater applications. Only the rarest of high end applications do I feel need to do that radical.
Infact, probably 90% who do go that route end up selling the "excess" baggage, and go liquid...buying a less ambitious setup. But, depends of course.
Also for most any tipical passive home speakers, I'm going to recommend a high crossover, like 80hz, yes. Control is an issue with passive speakers mostly, except the very high sensitivity designs like horns have some advantage. Otherwise, bass is much better with an active woofer, therefore making the speakers only play above 80hz. Good luck
