JL 6w3's for Cabrio rear speakers?
 

Has anyone swapped out the rear speakers in their cabrio with these? They would seem like the perfect scenario to have some additional bass in the cabin without a box in the trunk. My concern would be depth for mounting them.

Anyone know how much room we have behind the speakers in the back of the R57?

http://www.crutchfield.com/p_1366W3V...-4.html?tp=111