It's alright, but always check it's calculations against other calculators, like the12volt.com's for example. And that's how you figure out how much the tuning will go up. Find out the volume of the subs, and take your volume from RE's calculator, subtract the sub volume, then plug that into one of the calculators on the12volt.com. That'll tell you the tuning after displacements.
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Ohio Bass Society
Team XS Power
2010 120-129.9 Bassrace World Champion