Help with 4th 0rder Enclosure

[FIMPALASS 10+ year member]

I have got 2 18" DC LVL 5's and want to build a 4th order BP. I was wondering if anybody has tried them LVL 5's in a 4th order. And what box specs did you use. All I really need is The cuft sealed and cuft ported and port spec. Don't need a design because it is going into my trunk and I can design it. I have tried all the 4th order calculators and what I come up with just doesn't seem right. I would like a passband as low as possible. Thank you ahead of time.

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[FIMPALASS 10+ year member]

No one

 

[marcotheclepto 10+ year member]

you sure you can fit 2 18s in a 4th order in a trunk?

 

[FIMPALASS 10+ year member]

Yeah Gmonk is on it. He said it would be tight but can be done.

 

[marcotheclepto 10+ year member]

alright monks done a few id trust his design ;D let me know how it turns out. (im planning to rebuild my 15s to 18s) and would like to wall em 4th order.