This is interesting, but says nothing about the subjects - the people involved off the street. If I was blindfolded and someone handed me three tennis rackets and asked me to pick the one that felt the best in my hand, my answer would be the same whether I can see the options or not. I have no idea what brand is better and I certainly have no tennis racket brand bias. Now, do that same test with a golf club, and I will always pick Titleist if I can see my options.
The point is, if the subjects have no preconceived biases one way or the other, of course their results will usually be the same. I'm not surprised.
I ran my own blind tests in my "big amp blind shootout" this year. I had participants who would rather chop off their left arm than buy a solid state amp. I had others who would never pick anything with tubes. Going only by sound - in my system (and that's the caveat) - they all picked the McIntosh 601's over the D'Agostino, VAC, Cary, etc. Second and third place swapped, but the 601's were always first and VAC always last. When the guy who hates solid state picked the 601's and with the blind fold on swearing up and down that was a tube amp he was listening to, I thought he was going to vomit (as a side, he picked his own amp dead last claiming it sounded like "nails on a chalkboard").....that gave us all a good laugh.
In another blind shootout, we compared DAC's (Meitner MA-1, DCS and several others). The participants were, for the most part, vinyl haters. None had vinyl rigs and even the thought of one gave them indigestion. As we cycled through various files (Redbook, high res, DSD, etc.), the MA-1 was the clear winner (this was before the Lumin), but for fun, near the end, I snuck on a record (a few seconds into the song so they couldn't detect it was an LP). Everyone started jumping up and yelling "that's the winner! Whatever that is, that's the best one by far all day. Whatever that is, I want to buy it." I was on the floor laughing. When they found out it was a record, the excuses were flying.
The point is - biases play a huge part....but you have to have biases to begin with.
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