tigon_ridge
1000+ Head-Fier
The er4 has been compared as very similar to the re0, which I owned. It's been said that the er4 is slightly brighter than the re0, which imo is extremely well balanced. Perhaps the very definition of neutral; and I mean neutral neutral, not warm neutral or bright neutral. The re0's clarity, musicality and lack of sibilance had me aiming for its sound with EQ since the sm3 first arrived. Instrumental separation, imaging, and soundstage between the re0 and er4 has been compared as very similar. That said, after my long quest for a neutral EQ setting with the sm3, I have to say that the sm3eq has bested the re0 in all of those aspects, while also being faster and having superior bass extension and control.