A recent customer picked up a 4.2, and is not too happy with the bass (yup, has it turned all the way up). Has anyone replaced the Bose sub in the spare on their Q7? It's a lease so he's looking for something that won't require any gutting.

it's two different things, I bet.

to the doors and Base unit in rear. There is no seperate Woofer as such.
It is explained on their website but not very well. Bose control enter