1. http://www.head-fi.org/t/663709/vsonic-vsd1-vsd1s-reviews-impression-thread/675#post_9656518 As I said they are almost exactly the same with some small differences. The biggest difference is that the vsd1 has more mid-bass and the vsd1s has a bit tighter bass with more of a deep bass punch while the vsd1 has more of a mid-bass punch.
2. ?? If you're wondering whether a 4s is enough to drive them properly - then, yes, they are pretty easy to drive.
3. yes, especially for the music you're listening to.
4.Yes. And what do you mean by universal coz they are definitely not ciem LOL
Big thanks.About 4-i mean it's playable with many musical genres,i listen different music) My brains in 2 hours a.m. off ,when i posted it =="