More information is needed. What size is the box, what are the T/S parameters of the drivers? If you are concerned with sound quality you might just want to stick with a sealed set up; they are easier and smaller. If the box is prefabricated, you should throughly inspect it, see what thickness it is and what kind of bracing it has. If either of these are lacking consider building your own. As I mentioned earlier sealed boxs are pretty easy to construct and will most likely be better than a prefabricated one. Best of luck with your new system!