I was trying to make a box to go in the wheel arch, but it was too much effort to get it to fit properly (I guess you could use fibreglass or something rather than MDF) I gave up on that idea and simply threw together a box that roughly followed the shape of the speaker (square cone type thing - a pyramid with the top sliced off
) and stuffed it with quite a bit of cotton wool. it sits nicely just behind the seats in the boot, is roughly 13.5" square on the base (Woofer is pointing directly downwards), and the top is around 8" to a side. I put 'feet' with screws sticking out (spikes!) which make it grip the boot carpet and not slide around.
While I'm sure true audiophiles would point out where it's all terrible, it really doesn't sound all that different to the old box it was in to me now (the stuffing helps a lot).
It's a Mutant 12" sub that I bought with a box and an amp included as a package.
I'm not sure if you'll get anywhere near the 'Correct' volume with it being behind the wheel arch for a 12" sub. I know people have done it with 10" ones (there's a thread around here somewhere...) but I think a 12" is just too large to do.
I desperately need the bootspace because Will become a daddy in 2 months time, and couldn't fit a pushchair in the boot with the old sub, and removing the sub would leave me without the bass... which sucks of course.
Of course, I'm not bothered about how it looks to be honest, since I'm listening to it, not looking at it, so it isn't as neat as squeezing it in behind the wheel arch. Depends on your goals really.
