Many tweeters are designed around a short horn, often referred to as a flare, but the size, width, length, taper, shape, you know, all have to do with the design.
'Short' horns
I rarely see anything related to this subject but want to know the experiences and opinions of those who have used either speakers that utilize short horns, or the experience of anyone who has attached them to an existing speaker. I enjoy experimentation with just about anything audio, so these are on my list.