Yo guys, I got a deal on some unloaded cabs for next to nothing the other day and I'm thinking I might try and fill them. Now I know this is less then optimum as far as engineering goes. But i figure its worth a shot! It gives me something to play around with and potentially give me some sweet sounding cabs. I've been playing around in WinISD for awhile, but it seems to give you dimensions based on speaker choice, not vice versa. I have a matching pair of cabs that have the internal dimensions 23 1/2" x 20 3/8" x 12" Including the baffle the total internal volume is 5387.89 inches cubed. And the front speaker opening is 13 7/8" across. Which to me seems like an odd size. I'd like to put a 12 or 15" speaker in each of them. If anyone with any knowledge on the subject has any insight of any kind it would be really appreciated. Ill post some pictures of them later tonight, I'm just on my way out right now. Thanks guys.