I don't think this will change your mind but the Stryke SA-TW1 (you might have been thinking o fhte Stryke SA-rtw2)is a dome tweeter that is on sale for $7.00:

http://yellow.mynethost.com/~bv126368/shop/catalog/product_info.php?cPath=23&products_id=46&osCsid=a4981bbead726728c824d914a424a323

at this price I could buy 14 of them for every $100 spent to the 4 pt-2 for every $100.

Having said that I think that I am going to go for 8 of the pt-2 a-side and try using a 4th order x-over point at 2300 Hz.

What is your opinion of the PT-2s decrease in amplitude at higher Frequency. The Madisound graph shows a decrease of about 10 db from 1750 to 20K where as the PE graph shows the dip to be about 5db from 1750 to 2500 and then leveling off.

Is this audible (or even measureable) in the speaker you built?