I believe the Series 2 has the same mid range drivers as the Sophia 2, but uses the Titanium tweeter of the Sasha, Max, etc. The Series 1 had a different mid, and I am not sure about the tweeter. It might have been a berylium like the current Sophia 2.
Hopefully someone answers this because I have wondered the same thing.
Hopefully someone answers this because I have wondered the same thing.