Mike, I would adjust the crossover up to 60 for the center.

Even if it's getting some reinforcement from the cabinet position, the VP100 is not capable of good output at 60Hz and whatever is being measured is not at all likely flat.

Besides, 80Hz is where Dolby or THX or somebody really, really important recommends crossing over.

::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::