I had a pair of 511e horns for about a month. I ended up flipping them because I didn't have any large format drivers at the time. They were factory horns with thick aquaplas coating. The welds on the flange were very sloppy. I was not impressed with the construction. It looked like they just cut a 511b and welded on a 3 bolt flange. I am sure anyone with even decent fabricating skills could do a better job.
Sorry I cant help out with the performance of them. I didn't have any large format drivers at the time and ended up selling them for 10x what I paid.
If you end up making some you could build some "Rodspeaker" clones
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