Hi Norris, myself and a bunch of others over on AK speaker forum are building up these JBL waveguides using Selenium D210T drivers. There is a great crossover already developed for the combo as well. I had those JBL guides on for just a couple days. Below is a picture of my ESS AMT 1C project using the waveguide and Selenium instead of the Heil. Today I disassembled the ESSs and have been refinishing the veneer repainting all the black parts, and redoing the old funky grills with black sheer.
I thought the Pi midhorn was made to use the 10" Alfa driver. Wouldn't a 5" driver be too small for the horn throat? Cheers.
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