I wasn't able to find anyone who has installed shallow mount sub boxes behind the seats. Eyeballing it, it seems like a JL Microsub+ would fit behind each seat. Is this not the case? Or are SLK owners not into bass like I am? 
Not the best photo but:That's pretty slick. Super clean install. I was originally looking at a JL Microwedge+ but I mocked up a cardboard box at the same size and it's not gonna work.
However, I do have about 3.5" of space to work with. I could mount a Kicker HS10 to the back wall, potentially. I just need to find a thread to see behind the wall.![]()