I'm using this kicker sub. I don't have a back seat, this fits w/ my 37" in the tub. I have the amp for it in the foot well.
https://www.amazon.com/gp/product/B07N95QYQ7/?tag=wranglerorg-20
https://www.amazon.com/gp/product/B07N95QYQ7/?tag=wranglerorg-20