Thanks for the response. But to my understanding tho from what I read it's the 18" that has the 4" voice coil and the 12&15" have the 3" witch would be the same as the Nsv4. I could be wrong but it sounds like that in the read. And yes they do come with the neo magnet. They are called the team neo but those are even more expensive than the ferrite. Like an additional $500. And the Zv5 is what I'm running now but I just cooked it like 3 weeks ago that's why I'm looking for a new sub