fourth order for two 15's

[Lschevelle 10+ year member]

I been doing a little reading on fourths, and I think I want one lol. My question is how much space would two sundown x15's need for a fourth order?

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[mlstrass 5,000+ posts]

Did a 4 15's 4th with X subs about 4 months ago. Pretty sure they were in 1.75 sealed each and it was around a 2.5-3:1 ratio

I'd have to dig out the papers as that was many builds ago, but that should give you a rough idea...