Subwoofer Behind Rear Seat??? - 3rd Generation

I'm looking to upgrade the stereo in my non-JBL 2019 CM but see that putting a subwoofer behind the drivers side rear seat has become an issue since the "rear-seat-recline" feature went away in I assume 2014. Doing a simple measurement is rather difficult since you must remove the seat and then hope to get close on your guess at a box size. Any owners who have successfully put a box in this location could you offer the dimensions? The upper depth and lower depth are most valuable but any thing you can offer would help. I fully plan on building my own box and would like to install either the JL Audio 12TW3 or 10TW3 as their quality and mounting depth seem perfect although I believe the 12" is probably a stretch. Just for some BS extras its been a wonderful "dry" 110+ degrees here in Phoenix all week so this project will most likely happen 4 plus months.

 

I have the box from Fox Acoustics. No carpet, I feel it sounds better that way.

https://www.foxacoustics.com/ProductDetails.asp?ProductCode=TCM-210-14-V

 

Contact James@12TechVolts and just have him build the perfect sized box for your application.

 

also, do the mod when the seats are out so they can be dropped. easy, takes about ten minutes and a die grinder

 

@tech12volt