blow through 4th order box

[roycealbert1]

well this is what a threw together real quick. im thinking this port is more accurate for a 4th order.. http://s1372.photobucket.com/user/roycealbert123/media/box412s_zpsf243376c.png.html?filters[user]=139178511&filters[recent]=1&sort=1&o=0

sorry i dont know how to get the picture to show up on here..

and box dimensions are almost 2 cubic feet per sub sealed. and 11^3 inches for the ported part. then the port is 18x12 and 8in long

[john253a]

Your port needs to be around 340sq" that like 28x12

Other then that your design is what your after

[CleanSierra]

The X is definitely more of a 4th order bandpass friendly sub in my opinion. If you are thinking about 4 SA12s, do the 2 X 15s instead. I think you'd be much more impressed.