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The counterargument to this is that the differences are very subtle to begin with, and an additional A to D conversion plus a D to A conversion plus the amplifier required to get the signal to the end user's headphones add 3 variables that could obscure those subtle alleged differences between these two amplifiers.
That's not a counterargument. In fact, that's exactly what I said . Maybe you misunderstood my point? You're correct that those additional variables very well could obscure a subtle but very real difference, but that's exactly what I said in my post. If the difference between the two is subtle, an in person test is only way to assess that.
I genuinely think that the online challenge proposed by Amir is pointless and he may do a lot of prep work for no tangible benefit. .
This is where I disagree, as I believe there is a point. The point is that it could show that no significant difference exists. If those variables you mention(that I also mentioned) are sufficient to obscure the difference, then we can conclude that the difference must be subtle. There are many speaker comparisons on youtube that have those same variables, and yet it's still very easy hear differences between the different speakers.