The isolation is DEFINITELY better in the HD25-1 - much better. The isolation on the ESW9 is only fair. They won't bother people next to you, but they won't cut it on the subway.
The ESW9's are smoother than the HD25-1. They HD25-1's are on the borderline of being too bright in the treble. The ESW9 isn't. Much smoother. Also a warmer lower midrange. This is just a sound signature that I prefer. YMMV.
The ESW9's are smoother than the HD25-1. They HD25-1's are on the borderline of being too bright in the treble. The ESW9 isn't. Much smoother. Also a warmer lower midrange. This is just a sound signature that I prefer. YMMV.























