[M-Special]

I really have no idea, but if I were to venture a guess I would have to quote my favorite magazine...."There is no replacement for displacement" 4 12's would almost have to be the loudest wouldn't it? So loud in fact that I think you would need to have some intense mids to keep up, but then I've never been much of a bass freak so what do I know, I've never personally had more than a single 12 running and I've never felt like I need more bass. But thats just me, from what I've read two mag's on 1000 watts should in theory sound loud and clean if they are in fact as efficient as has been stated....Especially in a truck cabin.