Join Date: May 2010
Location: Dublin, Ireland.
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9 Cubic feet, with a 18Hz tune, and 1Kw of power, simulates 115db from 20Hz, seems really good to me.
You need a HPF at 13/14Hz to protect the driver.
Three 4" ports, 32" in length, keep the port air speed at 30 m/s max.
You could probably give the driver more power, in a smaller box, with a higher tune.
4 cubic feet gives a Qtc of .704 in a sealed configuration, excursion limited to around 1100 watt.
Hope that gives you some ideas to start with!