We toyed with building a new box to sit between the seats in the factory stock position. We tried our best to get a true subwoofer sound out of the space but it just was not happening. The Hertz woofer proved to be too anemic for the box and we moved to a
JL 8W1v2-4. Still we just could not get the sound out of the box that we wanted although the JL sounded a lot better.
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We ended up using the center console JL as a mid-bass instead of a true sub-woofer. The inclusion of the mid-bass abosolutely ended up KICKING ASS overall as it added a lot of balance to the sound in the cabin, with the top up or down. Probably would have not gone the expense had I known the limitations up front, but we were experimenting with seeing if we could forego the box in the passenger footwell.