If your time/money/mind allows, I would highly suggest expanding and opening your options. There are numerous subs that would make the W7 sound like a baby. While JL has top notch R&D and quality, there is a lot out there that offers more bang for your buck.
Sundown has been around since the mid-2000s. A kid named Jacob Fuller from the car audio forums got tired of paying high prices for crap and decided to make his own amplifier. It was cost effective, powerful, and under-rated. It quickly grow into a line-up of multiple amplifiers and a few years later he started building subwoofers and speakers. His amps/subs have been winning competitions for guys for over a decade now. This company is getting big and give them another 10-20 years and they will be a household name. I have already seen there popularity grow with more and more customers asking me about them.
https://www.sundownaudio.com/index.php/products/subwoofers-2
Other companies out there putting loud subwoofers include Digital Designs (last I checked, held the world record at 182.x dB), Sound Solutions Audio, FI Car Audio, and many others. Some of these guys are making pretty cool innovations. If you get time check out the FI BTL NEO, or the Sundown Nightshade. Even smaller innovations such as Digital Designs running 8 gauge directly to the tinsel leads have been pretty beneficial. Of course when people are putting 10,000 watts to the subwoofer, you need options like that. None of the "name brand" companies (Kicker, JL, RF, etc.) make subwoofers that are even in the same class as these guys top end woofers, in terms of SPL. The same could be said for sound quality, there are so many good options out there, it is ridiculous.
