I'm looking to build a single cab that has one 12 and 2x10's in it. I've decided that the 10's will be the lightweight P.Audio Neodymium drivers, I've used them before and like them. So the obvious choice for the 12 would be the 12" version of the same driver. Click HERE for details. As you can see, the QTS is 0.16. I've been using the formulas and table from Vance Dickason's book to determine the correct cabinet size, but they don't account for a QTS that low. And WinISD seems a bit puzzled by it. All suggestions welcome.