I really don't know much about these two subwoofers. However, the PS1200's are bandpass subs... they will produce ~3db less spl at frequencies that the box is not tuned for. Bandpass subs generally have less "tight" and more "boomy" bass. At least this is true for car sub enclosures. Anyway, it seems like a no brainer to me as well, but I'm not there to hear them. Either way I'm sure they will sound great.

Denon 5803 Denon 3910 Axiom M80ti's, QS8's VP150, EP500's (7.2)