just did this for a buddy 2 12s 3.9 cubes at 34hz IIRC i made it on the smaller side because he will be over powering the subs a bit just a simple ported box
other randoms!
the last 6th order for 4 10s tuned to 29 hz... got reaaaalllll low!
2 12"s ABC box worked well.. but didnt play the lows very well.. which i what i wanted!
the first 6th order/ported box i did for 4 10 DCaudio level 3 with level 4 coil and an extra spider.. sounded realllly good and got uber low!
i usually forget to take pics while building boxes... but. ive built manyy boxes!