I've owned the S4 as well as the S2. IMO it didn't better the S2 in any way. I was quite surprised by my findings as I had also owned the Studio 40 & 20. In the Studio's I felt the 40 walked all over the 20. To me, the real gem in the Sigs is the S2 with a sub. Pretty darn hard to beat IMO.
Using the Dynaudio S1.4 at the moment with the Dyaudio Sub 500.......Oh, my! I love this combo.
Using the Dynaudio S1.4 at the moment with the Dyaudio Sub 500.......Oh, my! I love this combo.