I built an under the seat box(es) for my nbs silver ado crew cab. It's 19 5/8 wide 18 deep 13" in the front tapering to 7" in the back 4" aero port 20.5" long sub is jl audio 10w3v3 disp of .05 I come up with 1.22 tuned between 34-35hz. Can someone check this also just want to be sure. Running 2 of these in separate identical boxes off a 1200/1 v3. Thanks.