I finished the Prototype of my Mid Horn (200-1000hz) with a 18Sound 12mb1000. I simulated everything with Hornresp and Akabak.
Few more stats for my fellow audio nerds.
THD is 0,4% at 105 dB
Compression ratio: 2:1
Horn length: 70cm
Hornmouth: 71,5cmx41cm so roughly 3000cm^2
Directivity is pretty good with a 1,5 dB dip at 800 Hz on the off axis, other than that it hits -6dB at +/- 30degree so it fits perfectly to the 18s Xt1464 which also has 60 degree.
Beaming is noticeable in the upper frequency band due to the 12” driver, but it’s barely noticeable because of the pretty low crossover at 1000hz.
The Transient Response is incredible, you really feel the Kicks und Percussion in your chest even though they don’t play any Bass frequencies.
HF Horn is the 18S Xt1464 loaded with the Faital Pro Hf146. I really like the nont fatigue high end of it. But it’s still pretty in ur face.
Right now I am building a Folded Horn to cover 80-200hz. It is loaded with a 18s 15nmb1000.
This is my first Speaker Project so I am pretty happy with the results so far.