I've owned a pair of 12W3D2's since they came out, and have used them in sealed enclosures, ported and even a ported isobaric configuration. In all instances, these woofers excelled. After purchasing a Hyundai Santa Fe, it was time to go with a smaller, more "amp friendly" sub. After trying 8", 10" and 12" sealed, I decided 12" sealed was the way to go. I brought in some Xtant and MTX subs, as well as various sized enclosures ranging from 1.05 to 2.0 cubic feet. As nice as the MTX 5512-44 and 7512-44 are, the 12W3D2 was the best of the lot. Lots of punch, even in the 1.05 enclosure. I really can't find a fault with these woofers, unless you want to say that their stamped baskets and foam surrounds aren't as attractive as many other glitzy subs on the market; I'd say JL Audio passed on the bling and went with the sound quality. Makes me wonder how good a 12W6 might be....
Epinions.com periodically updates pricing and product information from third-party sources, so some information may be slightly out-of-date. You should confirm all information before relying on it.