I have a 12 inch MTX Thunder 4000 and it pounds hard. My friend has 2 JL W3's and my one MTX sounds almost as good as one of his JL's. And yes, they are both hooked up right. I think MTX makes a very good sub (any thunder series, 4000, 6000, and 8000) for their prices. I love mine! JL's do kick some major ass, but in my opinion, if you have your system hooked up right, MTX sounds almost as good and you save a couple bucks!