You are referring to 2 entirely different crossovers. The 350 hz is internal to the speaker itself, cannot be changed (unless you change its components;)) and determines the point where sound rolls over from the woofer to the mid-range driver, and the mid-range cone to the tweeter.
The crossover in the receiver, is a setting in the receiver which determines the point where bass frequencies are sent to the sub vs the main speakers. That's a simplified but incomplete explanation but it'll do for now
Neither one is a hard point but the pt where freq's start to be rolled off.
Your B&W speakers are full-range meaning they are capable of low freq output, in your case with the 800's, to 32 hz -3dB.
You seem not to have a subwoofer connected...is this correct? The Pioneer is reporting SW No. IF you really don't have a separate subwoofer then you will have to set your front L/R's to Large, which MCACC did, and pick a crossover pt that is compatible with the bass capability of your surrounds & center. So far, the setup looks correct. But IF you DO have a subwoofer, that's a different story and a different scenario. You'll have to let us know for sure.
Assuming NO sub -
MCACC picked 150 Hz as the "best" crossover for your surrounds & center which it set to Small, meaning bass is going to be sent from those speakers to your fronts. This crossover might be a compromise or it might be a detection error if the mic wasn't positioned in the best place. This depends on the speakers you use for surrounds & center.....
so the next question is -
the bass capability of your surrounds & center? are they small satellites? what is their freq range? IF they can go down to at least 80 Hz, then you could manually set the Pioneer crossover to 80 Hz. But if they are small bass limited satellites, say good to 100-120 hz and that's as low as they can go, then the Pioneer picked what it thinks is the best choice. Since you didn't mention which speakers you use for surrounds & center, it's hard to tell what crossover it should have picked
Normally, I would say a bass crossover that high is not the best choice, since you can start to tell the direction of where the bass sounds are coming from close to that point. But if your other speakers really are that bass limited, you have no other choice.
Even though you have excellent
front speakers that I'm sure you spent a fair amount of money for, not having a sub is a compromised home theater setup. Low freq effects in dynamic movie soundtracks can easily reach 20 Hz range and even the subsonics below 20 hz. If you really don't have a true dedicated sub, I'd suggest that be next on your upgrade shopping list
Hope this helps.Edited by ss9001 - 7/25/12 at 12:52pm