The Plasmatronic tweeter by a wide margin. I have never heard a more accurate, effortless rendition of highs in my life.Alan Hill was well known in the Albuquerque audio scene back in the ‘80’s and was a delightful gentleman. Unfortunately his speakers could not keep up with the tweeters...Everything else I have heard or used is trying to get to the airyness of his tweeter. Some are very close...