I am new to this forum... but am getting back into the fun of audio....
Here is a pic of my first folded horn I built when I was 16... reverse-engineered from the original K-horn plans (thanks to the folks at the then-Bell Labs).
I used Nova-Ply rather than MDF or 16-ply birch, as its density is much higher, and much more stable (though it IS true that it sparks if you turn off the lights when cutting it with a saw . It is also really hard on carbide blades, as it glue content is very high.
http://home.comcast.net/~hempsp928/pwpi ... ipsch1.jpg
Second picture is a later version:
http://home.comcast.net/~hempsp928/pwpi ... 010020.JPG
I still have 5 of them, (which is great for home theater
I use JBL drivers now, 2450H for midrange, 2426H for tweeter. I bought a few 'real' K-horns from Klipsch... and they aren't even close in performance, but then again, it is a company, and has to make money.
If anyone is interested in antique stuff, I am unloading most of the tubes and tube equipment.
The Western Electric 713C's already went on Ebay.