So i found this calculator for minimum vent area:

http://www.carstereo.com/help/Articles.cfm?id=31

How accurate is this calculator? anyone use it before?

I used it for my 12" alphas (assuming ~25mm xmax, not sure what it really is) and it gave me a number of almost 50 inches of area per sub for minimum!

I was planning on using about 50-60 inches for each sub but i thought i was going big.

most people use 16 inches per cube right? by that formula i only need 32 inches each but i wanted to go bigger for more spl and sq (less vent noise) but if 50 is the real minimum i should use then i may go even bigger possibly 60-70 inches for each sub. but i dont want to go so big that the subs are basically in free air.

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