I think Wilson change tweeter to be able to cross lower with their (SB acoustic version) midrange, due its 4kHz membrane resonance. All new models benefit with smooter mids, but silk dome caracter is not as per se better. I still love resolution of metal dome and found not been fatigue in right set-up. Sabrina on the other hand is crossed higer and new twetter realy shine. We need to hear opinions from lucky owners...