Hey you speaker builders/hobbyists: I have a small thiele/small (EV TL 505)single 12 ported cabinet that has a rectangular port. (The port is actually divided up into three unequal sections) The middle section is big enough for a 2.5" X 4" rectangular tweeter which I want to add. I've cruised parts express but only found a piezo that fits those approximate dimensions. I recall on a Klipsch Heresy speaker cab I had years ago, that it had exactly the horn I need now. I'm pretty sure its made by Motorola. Its metal,probably titanium diaphram. I'll be crossing it over at 5khz. I have a GK10001RB-II with the seperate tweeter amp which I'll be hitting the tweeter with. Thanks for your suggestions and Merry Christmas to all, have a happy and safe holidays.