Hello, my new box was built today. Two sheets of 3/4 mdf, tube of liquid nail, box of screws, and dr pepper and funyons. Ok, 2 cubes, vented. Single 12, tuned at 41htz, vent is 2x5x6. No lost seat room ,and hits outragously (all spl here, no SQ or daily listening). Sub , Orion HCCA 12. Amp, Rockford Fosgate 800a2. (old style). 149.8 in the 1-2 street class, on dash. Im extremly proud, any help to get into the 50s would be apreciated. 49.8 was my best of 6 runs

 

if you want to get into the 150s, there's a couple more things you can try. First of all, bigger box, more airspace always helps. Second, find you truck's resonant frequency, and tune the port about 10-12Hz lower to match up the peaks (trial and error). Third, more power. Fourth, a Bass Cube or even increase the signal strength. Fifth, dynamat. Hope this helps