Has anyone designed/built/used a subwoofer box for mounting under the seat? I have an Xcab, and there's obviously room there for a big sub box. But that is not what I'm interested in. I would like to add a bit of bass without sacrificing ANY space. At the MOST I would consider the type that basically acts as an arm rest for the Xcab. I'm not looking to shake the earth, I just like the full sound that a sub provides. I've already upgraded my head unit and speakers all around, but it is just lacking some low end. I like the idea of the Kenwood Woox, but I have never heard one in person. I have Kenwood head unit and speakers, so it would be nice to finish off the system with complete Kenwood. Reviews say it does a decent job, and if I ever find a good deal on one on eBaY then I'm all over it. BUt is seems like a good quality 8" could be mounted beneath a seat and still have an enclosure with enough cf to do it justice. Anyone done this sort of thing? Thanks.