Did a 143.8 my meter (140.8 TL) @ 53 hz in the 1.1 cube box tuned to 53 hz with 6" aero if anyone was curious. Testing score with box in back seat tomorrow.
Best I've done is 148.2 my meter with two of the 10"s.
142.8 sitting in the back seat. Lost a full db going from box in the trunk to sitting in the back seat. I think the suspension on the RE SX might be a little too soft for the power I'm giving it, I might try some DD's or something with a little stiffer suspensions.
I've tried it before and it was quite a bit quieter for me, you'd have to seal off the back and basically wall it to make it effective, otherwise you get cancellation