hmm, that's kinda weird, and not usually recommended; kick (like everything else) has lots if not most of its "information" well above 100Hz. as such, the point of aux-feeding subs is to add the instrument into the subs while keeping it in the tops, never to run it into the subs only.
by "theater" do you mean a place meant to carry acoustically, to where the kick is already loud enough without the PA? i could see where a pinch of it in the subs only might serve to balance out the mids and highs coming off the drum itself, especially in an older musical style context where it isn't supposed to be punching through so much.