That there is an 18, and they used a crate on my 12" 4hp also, this one doesnt wiegh as much though, I'd say 45 lbs, and it was same state shipping, so it wasnt that big a risk. I'm going to get a second and put them on a 5 kw amp in a 4th order blowthrough on my truck.im just saying because they used a crate on my tc-3000 15". so what size is it? whats the set up you are going to be running on it?