help with bandpass design

[JBloud47 10+ year member]

I thinking about going for somthing different, maybe 4th or 6th order bandpass if it will work in an Explorer with no back seats. not looking to wall it.

Subs: 4 Sx 18s

power: XXX

max deminsions:xterior

W: 42 inside wheel wells if built around them width is 52

L: 60

H:23

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