Where is the subwoofer located in a 2008 Hyundai Tucson Limited how can you find out if it is working?

the subwoofer, i believe, is under your passenger seat -- move the seat all the way forward and you'll be able to see it from the back seat (rear right side door opening, that is).

the layman's way to figure out if it's working is to play some music and rest your hand on the subwoofer -- does it vibrate with the bass?