Playing with WinIST Pro, to equal the graph of a 3x12x.75 inch port, the 2x11 would have to be 9/16" or .5624" thick, which seem counterintuitive, but I am not ready to drag out the jig saw just yet.

I have not opened up the back yet because I am too busy enjoying these things to go to the trouble of trying to take out the 32 slotted screws and replace them with Philips head screws. I can find no information on the 32B horns which I assume have 802 drivers. It has been mentioned that they probably have symbiotic diaphragms, and frankly, they sound pretty good, but I do have a Piezo super tweeter helping them along...