I have a 10" sub I got off my friend. It's made by audio concepts. Yeah I haven't heard of them either. Anyway, it sounded great. It thumped pretty damn hard and had very nice clarity with his bazooka el1500 amp. It has a box with it also, not sure what kind (audio isn't my specialty) -- its a complete enclosure with no seams anywhere on it. I don't have an amp and don't have any money, so it isn't doing me any good. Who wants it? How much would you pay?