you guys are complicating this wayyy more than it needs to be.

 

Dukk's idea is actually a good one, it should help direct the sound waves/air and prevent the two subwoofers from working against each other.
But thanks guys, this made me think, and I WAS going to go with two JL 10W6V2's, but I decided on a single 13W6V2 in a properly designed enclosure.

 

Lol... good idea. Way simpler.

 

Not only that, It should be louder and hit lower notes if similarly tuned.