Figuring Sq-inches of port per cube

I didn't say volume is completely irrelevant. But the more relevant thing for a DIY box builder to look at is xmax and tuning when designing a box, for a variety of reasons. The most important in my opinion, being that enough port area for one car audio sub can be entirely too little for another car audio sub in the same box volume with the same tuning. And vice versa.

This is why so many people have problems with their boxes... because they start with a low xmax sub in a prefab with enough port area for that sub and then, when they go larger their bass doesn't sound right and they bash the prefab when in reality, it isn't the fault of the box. And to boot, the same thing could happen to you or I if we build a box for an entry level sub and the buyer winds up shoving a high powered sub in it later on.

And 10-17in² per cube is a wide range, especially when one considers that most people build 3-4 cube boxes for 15s. What you're saying in that scenario is than any car audio 15" sub should be fine with anywhere from 40-68in² of port area and that's simply not true.

 
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