One woofer in a proper box or two in a smaller box?

[Oldegold 10+ year member]

So right now I'm running a single psi audio 15" woofer in a 4.3cubic foot box which smallest recommend box is 3.5. I have another 15 and I was debating if I should put it in the only problem is that I can go bigger with the box which means I would have 7.0 recomend in a 4.5 max box and I dont know how it would sound any opinions.

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