I recently got into fiberglassing so my first project was to make a new speaker box. I was just going to make a fiberglass face for the sub to sit in and do the rest of the box in wood. The problem is I dont know how much space I need inside the box for it to sound good. I'm sure this is a totally ridiculous question to anyone experienced but I have no idea. I talked to someone and they said to look on the box that the sub came in and it should tell me but, of coarse it said nothing about it. (It was a cheap off brand fifteen inch ''XXX'' sub) I now have the face done and I'm just waiting to find out how much room I should give the box, if anyone has any info PLEASE tell me, thanks!