Which Will Be A Better Sq Sub?

[Bert]

If you can afford the space, a 15" sub will do well in SPL and SQ as it has good low extension and punchy bass.

4cu/ft is waaay big and should be considered if you dont mind giving up your whole boot or if u have a Pajero sized car.

 

[xcheong]

one question, for sealed box, is it the bigger the better or the smaller the better?
wat's the advantage/disadvantage of both?