Dude, what are you talking about?
Just because its "prefab" its crap? First you say its not designed around the sub, uh its from JL for THAT sub. Then you say its not 'engineered around the interior characterisitics'... what? My door panels are gray ABS plastic and I have fuzzy dice hanging from my rearview, how should I have designed my subwoofer enclosure accordingly? //content.invisioncic.com/y282845/emoticons/eyebrow.gif.fe2c18d8720fe8c7eaed347b21ea05a5.gif Unless you are going for a custom SPL rig where you are tuning the enclosure around the vehicle's transfer function (and why would you use a W7 for that), the JL box should work fine. Its just pricey, and make sure it physically fits the space you want it in.
I swear, people these days jump all over the term 'prefab' without even using their head. I even saw a guy the other day make the same arguement against the poor tuning characterisitics in those prefab sealed enclosures. //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif