So I have a 12" x.x.x. in my jeep wrangler in a sealed box behind the rear bucket seat. I've noticed from the very beginning I dont get the same bass as I do when I have my windows down. I remember reading about this awhile back, and forgot what the reason for this is? I even did the penny on the roof thing. With the windows down the pennys bounce everywhere but the windows closed they barely move. Also.. would this change if I go ported? I thinking about going ported and this would help my decision.