I've never been satisfied with the bass in my car, which is a 2016 Chevrolet SS sedan. The rear seat blocks/absorbs a significant amount of the sound and I can be almost happy without the subwoofer even being there unless I was listing to something really bass heavy - and I'm usually listening to rock, blues, or country. I went from a 10" PSI to a 12" SSA Icon both ported and I think I also don't love the ported sound as much either for music. I built a down-firing sealed box to go between the second row seats in my Escalade for a GB12 and it sounds awesome. So I was thinking about trying to replicate that in my car. I think there's enough room behind the passenger seat to build a sealed box for a GB10. It'll be a little "complicated" because it'll need to be angled to allow the passenger seat to be comfortable. I'd like opinions on whether I should do this down-firing or have it front-firing into the back of the passenger seat. The down-firing will push the box height up ~2" or so to leave some breathing room.
The base can be up to 12" deep by 18" wide. The back can go straight up and can be up to 13.5" high without being taller than the rear seat bottom. At the top there is about 9" between the rear seat cushion and back of the passenger seat. I've attached some pictures of the space to help visualize.
Does this sound doable or a good idea since it will be directing the sound under the passenger seat if down-firing or into the back seat if front firing? Up-firing could be an option depending on how much space there needs to be behind the magnet but I like that down or front-firing will provide built-in protection for the speaker. I guess my other option would be to do a ported GB12D4 in the trunk and hope it sounds better than the SSA. It would be nice to have my trunk back though.