A little birdie once told me that Spiral Ears had actually written a white paper (probably not peer-reviewed) on what is the correct tuning for an IEM, and that SE5 was a culmination of that research. I tried to get my hands on it, but the person who had acquired it from Gregorz had deleted it, because it was in Polish and he couldn't read Polish. This naked dance method sounds more plausible though. @Mimouille , if you are close with Gregorz, may be you could ask him if he is willing to share the white paper. We can use Google Translate to get the gist of the contents.