Taken from the interview , sounds familiar lol
Hard or Soft
Before listening began, there was one question I was dying to pose. If I had $1000 for each time a speaker manufacturer has made a point of contrasting his hard-dome, ultra-hard-dome, or super-ultra-hard-dome tweeter with Wilson's soft, silk-domed tweeters, I'd have enough money to buy a pair of Alexxes. Hence, I asked Dave and Daryl, "How can your tweeters have anywhere near the resolution of hard-dome tweeters that have taken years to develop?"
Dave: "I do find it interesting when people look at things in terms of speed. I've been in this field a long time, since the first solid-state amplifiers came out and were considered better than tubes because they were faster. If someone has a problem with silk-dome tweeters but they play vinyl through vacuum tubes, there's a certain inconsistency there.
"In the final analysis, it's what you like. One of the things about a soft diaphragm is that when it goes into break-up mode, it breaks up softly and gradually, like soft clipping. A rigid diaphragm has some real benefits, especially if it's light, but when it goes into break-up mode, it's harsh.