I love the idea of blind listening but I found the article a bit lacking to be honest. I am going to criticize it a bit in an attempt to provide constructive feedback for future blind tests.
1.The article did not really state what kind of music was played, who actually picked the music and whether the participants had any kind of control over the playback, except for being able to switch between various amps instantaneously. In my experience, it really helps if a participant is listening to a recording that they are familiar with and if they are able to rewind while listening to compare short musical phrases rather than longer pieces of music.
2. The author should have stated whether the amps were in the low or high gain mode. So a bit more technical detail for us nerds.
3. The actual results for all three headphones should have been presented - a scorecard with a summary of participants' comments for each amp.
4. Correct me if I am wrong, but all three headphones were open back - next time please throw in a good closed-back to avoid external noise playing a role.
All in all, a fantastic idea and a very brave one. Can you imagine if next time participants actually prefer the Magni 3+ to the Lyr 3?
These are fun events, not AES-level research projects, frequently ad-hoc assembled in very short timeframes. There were no scorecards. Hell, there were no notepads. There also wasn't a proctor with a yardstick enforcing methodology, serious study, and absolute silence. Hell, I had been drinking, and lots of other people had been as well. We just said "Let us know what you like, and if you want, guess the amps." That was it. These are small events, not designed to produce lab-grade data to change the underpinnings of the audio universe.
If I had a billion years to plan this, and nothing else to do, I would have probably chosen at least one different headphone, and we may have even gone hog wild with notepads, sure. Maybe. Or maybe not. If it gets to be too much like work and too little like fun, I don't think anyone will want to do this anymore. Sorry, that's the reality.
All that said, I covered the music question in my post. Anyone could choose anything and listen as long as they wanted.
I also covered how we did level matching (with an analyzer, using the actual transducer.)
Amps were in high gain, and were not switched. As I stated, nobody had access to volume to preserve the level matching.
And finally, as before, I have to warn against extrapolating from such a small dataset. Even if everyone liked, say, Vali 2, can you say that tube amps are universally "better?" Of course not. The next week with a different set of people could product a different result--like everyone preferring Heresy. Does that mean that better measurements are universally better? Again, no. These are a handful of people, listening for a few minutes, on headphones they don't own, from sources they aren't familiar with. If you use that to extrapolate out a Universal Audio Truth, you're probably going to be dissappointed.