Today I tested a good improovment in my speakers. I would suggest it to you an to the other dyer if it wasn't so expensive.

A friend of mine gave me a couple of Great Heil Tweeters (unfortunately just for a test). I tried them with a firs order filter, an ASC 15u cap, without attenuation.

They sound amaizing.
Even if the cut is a little low. With an incredible "presence".