We come because my black anodized mussels better fallen P2, I had actually just ordered me.
On the web one reads some reviews, the S2 better sound quality than the certified S1. I can not confirm that.
The S2 is very bassy and apparently has a lower efficiency. With the same volume setting on Wiedergabgerät the S2 is quiet, about the iPhone5s 2-3 bar in the Volume Control.
All in all I can the S2 sound, especially at the current market price, do not recommend.
The S1 is clearly a better choice. Comparing times awhile prices ...