Looking at adding a sub to my system because the stock non-JBL is just completely lacking in that area. I listen only to rock music, so I just need enough bass to fill the car. I dont want it to be heard outside of the car, down the block or anything. I'm basically far more concerned with quality than quantity. I want to feel the thump of the kick, and hear every bass note clearly. Right now, with the stock system, the kick is sort of implied rather than heard clearly, and half the bass notes are simply non-existent. Its a lease, so it needs to be self contained, and very small. I used to have a kenwood WOOX a few years ago that was a smaller 6.5 sub w/ 5.25 radiator - I wasnt entirely enamored with it, it sounded a bit boomy, but it was better than nothing for sure. I want something slightly tighter and deeper. I was considering the Infinity basslink, which seems to get generally good reviews, but I'd have to mount it in the trunk and take up trunk space. Id really like to mount one under the seats for simplicity's sake, plus having it right under my ass will certainly help me "feel" it. I'm considering this BOSS BASS1200:http://www.amazon.com/dp/product/B001DXF990?tag=priuschatcom-20 have any experience with it? I'm hoping by virtue of it being a 10-inch rather than a 6.5 it should sound cleaner than the WOOX. Is there 3 inches of space under the seat? Any other under-seat subs I should consider?