JL Audio 12TW3-D4 Shallow-Mount 12" SubwooferBass for challenging spaces If you've got a pickup truck, sports car, or you just need to haul a lot of stuff, then you know that adding some bass can be a challenge. That's why JL Audio built the TW3 Series 12TW3 D4 shallow mount subwoofer. This super thin 12" sub puts out big bass, yet only requires minimum air space, so you can use a much smaller enclosure. Now, you can have your bass and your space too. Don't let this sub's low profile fool you,