You ve got an awesome subwoofer there pal. But where s it gonna go? You can t just throw that thing in the trunk and call it a day. Don t worry Belva s got your back. With superior construction great features and everything you need for bass you ll be ready to pass up that entry-level box you ve been eyeballing. Belva Subwoofer Boxes are CARB Phase 2 Compliant - You get quality boxes with solid 3/4 MDF because nothing else will do the job right. You want to flex your windshield not your box s innards. You get polyfill built into the box making sure your subs perform perfectly. On top of that you get a box that s CARB Phase 2 Compliant meaning your box won t emit as much nasty formaldehyde as the competition. Better for your bass and better for you.