Believe or not, I helped my buddy BJ put together a sealed DPL12 subwoofer that looks like a chest of drawers and one of the drawers works! Check it. DPL12
I still have reservations but for now it doesn't rattle. The drawer mechanism is installed a little tight and it's self-locking. Time will tell. The bass from this 75 liter sealed enclosure is very clean and musical, not boomy at all.