Prior to re-400 I had a sennheiser IE-6, they are bassy headphones, just like your S4. First I've upgraded IE-6 with much better, but still bassy full size cans - sennheiser momentum. I enjoyed the momentum, but when I've got RE-400 with completely different sound signature I was very very impressed. A whole new sound world to explore.
Edited by Dog meat - 5/19/14 at 2:31pm