I have to build a box for a 12" square hifonics atlas sub.. I'm going to make a sealed box but i'm unsure how many cubes to make the box.. I was guessing around 1-1.5? Anyone have any recomendations?

I have to build a box for a 12" square hifonics atlas sub.. I'm going to make a sealed box but i'm unsure how many cubes to make the box.. I was guessing around 1-1.5? Anyone have any recomendations?
Thier specs say 1.5

thank you.
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