I built two of these back in the mid 80’s from the plans that EV sold. My father built one unit back in the 50’s. I just finished revamping the tweeter and mid-high horn with Klipsch 77 and 55 drivers. My build looks like a very large set of Khorns. I’ve been pleased with them for many years but the current upgrade I did brightened them up from the drivers I had originally built them with. I’ve enclosed a picture. Hope the best for anyone building these. There were a few things in the plans that had to be figured out during construction.