When building a system with 533-PTs that have the built in subs, does that mean these subs only respond to sound fed to their channel, in this case the front left and front right? Meaning that they won't give support to the center and rear speakers, like the 522D-LR and 522D-C?

My worry of this comes from the thought of a movie where you might have something like a T-Rex stomping from the rear speakers and they won't sound as low as if it came from the front speakers with their 8" subs.

Or do the 533-PT have a spot for connecting the subwoofer out from the reciever so it responds to bass from all channels? Or would I just need to add another 8" subwoofer to the mix?