Basically, with a rear seat down I get the output I am looking for. I'm not looking for teenager mirror falling off bass, just a lot more than I get with the seats up. I think having a 2020 is also limiting my output because the rear deck is completely closed compared to earlier models that had a vent in between the rear speakers.
I believe that is true. I even saw a guy on Youtube swapping his deck to the ported one. I have a 2018 so my deck has the pass-through port. My JL 12 in sub located in the sub trunk has tons of bass now and tons of margin. I have the gain on the amp set at about 40% and the EQ on the radio set at 0 and I can feel it. Any more than that and it gives me a headache after a few minuets.