Speaker and Sub Crossover help

[Kali157]

I have read the sticky on crossover, but the tech talk kinda still confuses me. I need help setting the crossover for my new speakers. My speakers are Polk CS20 center, Polki TSi200 fronts, Klipsch S-2 surrounds, Polk PSW110 sub. My receiver is Onkyo SR607. Now I ran the receiver Audessey mic setup for my speakers and the receiver came back with this: Center 40hz, fronts 40hz, surrounds 90hz, and 90hz for the sub. Does that seem right? I am trying to avoid frequency holes. Should I increase the fronts and center so more of the bass will be handled by the sub? Is there any advantage to move the lower frequencies to the sub?

My other question is if if the sub is set at 90hz and the center and fronts at 40hz, does that mean that any signal btwn 90hz and 40 hz will be sent to BOTH speaker and sub? That is, if a sound comes through for the front channel at 60Hz, does that sound play at the center ONLY or does it play in the center AND the sub?

I tried to look for answers in the threads but couldn't find it. Thanks everyone for the help. I just want to make sure I setup my new speakers correctly.