I turned the EQ on my phone off and turned down the bass on my stock head unit as soon as I got the car back because it was too much for me.
I need to retain trunk space that is why I opted for a shallow mount sub. I told the shop they can utilize the entire spare wheel space if they needed to but they opted with the box size you see pictured. I don't know anything about speaker environment so I assumed they knew what they are doing building the box that they did.