It all depends on wut the sub recomends.Look in the manual for your sub it should have sealed and ported box recomendations,meaning the cubic feet,wut a ported box should be tuned to,it might even give you the exact dimmensions so you copuld build one yourself.You cant just through any ole sub in any ole box,well you could but it would not sound right at all.The box has to match the subs specs.