My Snell Type E's (basically the same as the Audio Note E's) use wool strips around the dome tweeters to control dispersion. They do sound very nice!
Audio Note E Speaker Tweak: Easy Effective And Inexpensive
I wanted to share a quick, easy, tweak I’ve made to my old E-Ls. I’ve basically boxed in the tweeters with strips cut from a roll of jute mat, available from any carpet store. They’re held in place with blu-tak, so they can be easily removed.
At least in my system/room, the results have been remarkable. The sound is smoother, more coherent and more transparent, with lots of natural detail. I can hear the recording space and decay more clearly.
If you decide to try it, please post your results.