I could be wrong at this since Rin's article isn't exactly normal English writing, but I think the 6dB discussion is a little blew out of proportion some time - No, I am not saying he doesn't have a good ground to make those claims, but MH1 isn't exactly tuned for reference sounding in the first place. It was supposed to strike a good balance between your average, more bass carving casual listener and those of us who are more critical in music listening. The final tuning is actually done with feedback from both musician and normal user alike, and they might or might not looking for a reference sound, but rather an more enjoyable sound. I don't think anyone can deny that there are more casual listener out there than there will be critical listeners x 100. Even among audiophiles, not everyone is looking for a reference sound and that's why not every top-end IEM / CIEM follow the same ideal curve Etymotic is using, and less so on a headset that is not trying to be reference sounding from the beginning. If there is an IEM maker claiming they have the most accurate sounding IEM in the world, then the 6dB discussion will be more relevant - or we can all start to proclaim if an IEM is not reference flat, it is not worth listening.