I have a single 10" sub in a custom box....the box is mdf on the top, front, and bottom, and fibreglass on the back and remainder of the space. It was made to fit perfectly into the side of my trunk. There is no polyfill in it now, but I was wondering if I should add some. If so, do I just stuff it full or just line the interior?

Thanks

 

see Dave, i'm not the only one....