go with a fiberglass box. that way you can fit 2 12s under there. with the bigger voice coil on the 12s you will get deeper responseJL 750HD would be good for 2 W3s, but the only issue is it'll be a sealed setup. That's a tight bass rather than a deep bass. I want ported & I believe the W3s need 1.75 cubic feet per sub ported & there's def not that much room under our seats.
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make a trip out here. i will build you a box at my cost, just so everyone knows its possible.Was gonna go with that but talked with nosbusa, I think you'd be happier with the setup I'm looking at now. Supercrew Sound box with 12's pioneer shallow mounts and rockford Fosgate amp. The 12's may not be as loud as the 10w3's but it'll give you deeper bass