ill have to look into the MTX. This might be a dumb question, but wull i get more low end from a ID8 than from a 10" pioneer shallow sub?

no, but it would be cleaner.

Hi hdskull,

It fit in/on the spare tire. It essentially takes up the space inside the rim and sticks up above the tire the height of the styrofoam shelf.

3/4" MDF is $32 (used most of the 4'x8' sheet after a couple mess ups)
1/2" MDF was left over, but $25 for a full sheet (only need half a sheet)
Black paint was left over, ~$3 for a can of spray paint
Liquid nails is $2.50
Screws ~$2
Polyfill ~$5

I have a router table that made it pretty easy once I made a circle cutting jig (just a piece of wood with a dowel in it that I would spin a square piece of the MDF on to make a circle). I cut out a circle to the correct outer diameter, offset the jig by the thickness I wanted the ring, and then cut out the centre of the ring. Cutting the pieces probably took 4-5 hours, with all the setup and redoing a couple of rings I messed up. Letting the glue dry and paint dry took several days. Took me over a week because I just worked at it a little each day.

The Pioneer speaker is pretty tough. It's not like it has a deep cloth cone or anything - it actually has a hard plastic plate on the top, plus there is a raised ring around the speaker. I put groceries on it all the time and don't feel like it is getting damages.

Good luck if you make your own.