hello all....I will add my $.02...There was a compact sub that Pioneer made a few years ago that was designed to fit into the rim of a space-saver tire. It was made of plastic with a special acoustic chamber to amplify the bass. I bought one when I first ventured into upgrading my stereo system. It was fairly cheap and hid away well without losing the spare. Problem was, it did not take power well at all. I ended up going through two of them. Even at modest volume, the speaker cone had a habit of separating away from the coil. This produced a horrible buzzing sound when you hit the lows. I took my second one apart to see if I could fix it (sealed unit!) and to my suprise, found a tiny 3 inch paper cone. What a bummer. Needless to say, it is not a good sub to concider. Go with a full sized one and get a good install, you will be much happier with the sound, I was :) John

Technoweenie
12 GB Blue/Red MK2