I have a used 12" MTX 9500 in a slot ported box (2 cf I think? Whatever MTX recommends) for sale. I only used it for a little over a year and it still works great! There is a tiny "crease" I guess you would call it on the rubber surrounding the sub, but like I said the sub still works great. I tried to show this in the picture, but I don't know how well you will be able to see it. I just decided to go with 2 10's instead of one 12 so I need to part with this. Looking for $250. Or shoot me an offer it can't hurt.