Thanks! Now i have 146-148 at 35 -45hz and 144 at 30! I know this sub's can more!)) But i don't know how in my car.... whar box and port spec do you have?
That's still really good on your numbers. Are those numbers sealed or outlaw? My car would only do a 46.6 sealed up, but outlaw it really gained.pMy box was 6.2 cu. ft NET, and I used one 8" aero port tuned to 33.5 hz. Sounded really great.
As Stealth mentioned, doubling your front baffle could help brace it as well. Birch ply definitely needs to be braced. You could also add 4 more dowels to each corner of your box; around the sub cutouts facing forward to brace the front and rear pieces.
If you really want to increase dramatically, you may have to add another amp. Trunk cars are somewhat power hungry if you really want to see 50s...especially luxury cars.
Thanks! Numbers are sealed at 35+ hz. Outlaw gained at low hz below 30 hz.