Voigt 4ft Tractrix Horn
People talk of Western Electric being rare but no these 4ft Voigt Tractrix horns are extremely rare. Likely only a handful of the big fellas exist. I only see ads of people looking for them and a few pictures of them on the internet. These look incredible.
I would like to try this approach some day. This reminds me of what Dave Slagle of Intact Audio does with Lowther drivers and big round Le Cleach horns.