4th order help? Blowthrough

[cris2216]

I want to build a 4th order bandpass box to use as a blowthru in my 2010 silverado. The specs i came up with is a 2:1 ratio, 12 ported and 6 sealed for 6 sundown SA 12's tuned at 42hz. Are these specs ok or is it too small?? I want to hit the lows (24hz-28hz) if anybody has any suggestions tell me

[CleanSierra]

Tuned way too low in my opinion. You might be able to hit the mid 20s but what about mid 40s(where a lot of audible bass occurs)?

I would get tuning up a few more Hz, at least to 45 is 46. A 2:1 should have a decently flat response, therefore having some breadth in the frequency range.