I went to pick my car up and it still sounded HELLA! weak, so I told dude I'm not paying for that." I asked you to build the same box I had and you didn't" So he said he could add the port to the sealed box. I guess its called a ported bandpass? I dont know I just know what slaps and what doesn't. Well anyway I picked it up and it slaps just like I told him it would with that tunnel. But the only problem I have now is I notice the more I turn up the volume the less deeper the bass gets? Anyone have a idea of what that could be. I have a EQ if that helps.