There's a lot better alternative to JL audio, and for much cheaper too. JL makes quality product, but there's better for the money.
Look into Adire Audio, Image Dynamics, Digital Designs, Resonant Engineering, Diamond Audio, Crystal, Oz, even Eclipse alum or ti' models, some Audiomobile if you can find any of their products still around, or A/D/S RS series subs. All great stuff....