I happen to have the loudspeaker cookbook. It is very technical and VERY detailed, which is good in some cases but when I am looking for something specific its a little hard to extract it from the text... Fantastic book tho... I also posted on PE tech talk and Im waiting for a response. I may go ahead and order the drivers because im pretty sure I will use them, and do some research and look at some impedance curves for the tweeter and see if I cant figure something out.