Ported box for 3 Eclipse 88120.4 Subs

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I need to redo the ports the 2 4" i think are just too small. I am going to buy 6" pipe but i need to know if i should do 3 6" ports or 2 6" ports. How much port area do the 3 eclipse subs actually need? If i do 2 6" pipes the area will be 56.52 inches squared of port area be enough port area?

EDIT: actually i cant do 3 6" because the ports would need to be 30" long and i just don't have that space. for that long of a port.

 
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