Quick box question

[Xaisk]

Quick box question.
http://www.deffaudio.com/store/product_info.php?language=en&currency=USD&products_id=764

takes 2.00 cubic feet box.

Im pretty sure thats for just 1 sub. If I put 2 subs in the same box, do I need to increase to 4.00 cubic feet?

[Strugglebucket]

Yes.