[DVSNCYNIKL]

Okay. The bass will naturally get louder when you open up the space it is in. Not sure exactly what type of vehicle you have but, you have your boxes and then you have a Band Pass. I personally like band passes cause they move a larger volume of air, as in my example of my truck. The bass was ridiculous, I had the setting at -6, and still had an obscene amount of bass. But, if I opened up the rear window, it was all gone. So you see, depending on your application, you'll get that. Since you have a custom made box, if your car has a trunk, you'll keep the bass in there. If you open it up so that the passenger cabin is open to the bass box, you'll get that increase effect. It's moving the air in the cabin. If you want to keep it at a minimal, just leave it enclosed. Hope that helps!