In response to the new tweeter questions over in the Home Theatre section I thought I would switch it to the What’s New category.
The tweeter change is happening across the entire line. I have put a picture below of the standard round faceplate version. The new tweeter has a die cast aluminum face plate for better rigidity and cooling, a larger rear chamber to lower the resonance frequency further below the crossover region, and a new horn design that Andrew developed to be smoother off-axis above 12 kHz.
I noticed some were not sure about the new look but it could be more of a QS4 thing. The consensus around the factory was that it is much nicer looking.