air tight or not air tight

im tryng to seal my subs box that cost me 300 but i dont like the blurr from where the air comes out im thinking of buying an air tight or just sealing the one i have

It depends on what needs to be sealed in order for it to be completely sealed, is a slot port, tube port, or what. WHat brand enclosure and whats it made out of. I have a slot port box that i made some pieces so i can run sealed and ported all i need to do is remove 4 screws and it pops out for ported.

The only air that should come out of a box is through the port.

^^ That is correct. I would say try and seal the one you have right now or else if you want to try a ported box you can pick up a sealed box that can be ported as well by removing a recangular piece on the box with four screws in it at Best Buy for $173.

http://www.polkaudio.com/caraudio/products/db212/thanks guys oh and these are my speakers the ort in the middle is the one i want to seal

SLot port. Id look into a new enclosure. IT wont look as nice and clean with a piece of MDF screwed to the front. You can get them on ebay for like $60.