Few, if any other, headphones seem to create such a strong love - hate relationship as Grado RS-1. I love it when it works, if I didn't have other headphones to switch to when it doesn't work, I would hate it too.
RS-1 is fast, punchy and with some kind of flow that gives an exciting presentation of some recordings, especially rock but not only rock. Then it gives a fast and dynamic presentation where I find that for example HD650s are a little slower and sometimes tend to lag behind rythmically.
RS-1 doesn't even work for all rock but works for example for Rolling Stones. I haven't yet found the criteria when it works and not. I have wondered it it could have something to do whith the speakers they have used for mixing and mastering the albums. Nik said that it has a "rock equalisation" and I think this is a very good description (actually Nik's statement was on PS-1 but I think it is even more valid for RS-1). This equalisation, or the frequency response, can result in a treble quality that can be more or less disturbing, sometimes extremely.
It seem that PS-1 can be a solution, although expensive. But is it as good as RS-1, when RS-1 is good?