IN MOST CASES ported will be louder, but when dealing with a driver that isnt round (example: square or oblong) you will get louder with sealed, and he hit it right on the head with the displacement commend, all it really does is add room to the box, yet exposed all of the soft parts to the elements, so unless you have a garaged car and a pretty hefty woofer, i dont recommend going inverted.
Elaborate please.
Was thinking the same thing