responsiveness is what i mean haha, couldnt think of how to describe it. like you guys i was thinking a smaller sub, but would a port make the one i have now more responsive? atm its only a cheap strathfield sealed box. im probly thinking about this the wrong way too, when i played drums i used double kicks and to help the bass drum recover quicker so it could play the fast bass kicks louder you had to port the bass drum skin to let the air recover quicker, and thats how im thinking of a sub, which is probly the wrong way to think.