I purchased 4 of these subs, and all four were defective. And, though i was certain that i was not at fault, just to make sure, I took one of the broken subs apart. (OCS will replace damaged products, but it costs more to ship them back then they are worth) Taking it apart, I found that these subs are complete junk. For one, almost half of the weight that lanzar would have you believe is their magnet, is a 3/8" thick steel protector plate in the back. What they presumed to be protecting the magnet from, I don't know since it is made to be used inside a sealed enclosure. Spider tinsel leads were improperly threaded, and on all four of my subs the cone was improperly secured to the sub housing. In short, these subs are junk, and lanzar is well aware of that.