If you are going to go active I would go with 16 per tower 4 sets in series of 4 in parallel giving you a 4ohm load. I would also go sealed and eq the low end up. ====/====/====/====

With the PT2 use between 8-12 per side. I use 100ufd capacitor on them for protection. 12 will put you at almost exact the same vertical as the mid line of 16, but realistically Use a 48db slope between 1800-2000hz. 6ohm load ====/====/==== or 2.6ohm ======/====== depending what amp you are using.

The easiest way to go active is to use the crown xti amps. They are slightly costly but have all of your eq and xover features built in! Or use a behringer dcx2496 which is what I am currently using.

Thanks for your help, These have been sitting for a few years and I have the bug to build, and listen.
THANKS!

Here is one example: http://www.audiogrid.com/audio

If you do not have equipment to measure the drive T/S parameters, driver from a decent manufactures number are close to actual specs, some may very

Tom R.

optimal power for the mids is 200 watts if you will be using eq. You reach xmax at 50hz and be -12db. These are very efficient though so you could almost definitely add 12db of boost keeping flat frequency response to 50hz or lower depending on you're desired SPL.

using the dcx2496 as your xover you can tailor the response to anything you like though as long as you go with a sealed box. So you could make it not as deep if you needed to, keeping in mind it will require more eq down low to get the same response.

Again these are just suggestions from my experience with these mids and tweeters. Going with a sealed box, enough pt2's, those mids, and a good xover like the 2496 it will be hard to go wrong.