Interesting,
I am glad that I have about 80 of the old version remaining.
The changes don't look dramatic, but may require a change in crossover. I really don't know at this point.
I do notice the inductance of the new driver is considerably higher, and the cone looks slightly heavier. The heavier "cone" might be due to a heavier surround. Indeed the shape of the response curve looks different in the 2500hz zone. This is directly due to the surround material. Indeed there has been some "flux" in the surround material over the years, but this change seems dramatic too.
I will certainly query SEAS concerning the changes. Thanks for letting me know about this.
Dave