just starting subs

Hello all, I'm new to the forum and I'm starting to find a lot of interest in audio systems (to be more specific, car audio systems). Right now, I'm trying to learn about how sub-woofers work, and how their enclosures change the way they sound. However, seeing as I'm pretty new, a lot of my questions would probably be pretty dumb. I was wondering if someone could point me in the right direction to start my reading up on the subject. Thanks you.

Alright, thanks for the direction ;)