"I for one believe you. Imagine that. Trusting how something sounds! "
I do too! There is no question that is what he perceived. It is just that we don't know if that depended on the actual output of said DACs or other extraneous factors. Our brain is a wonderful thing when it comes to manufacturing facts. To make sure that is not happening, we only trust listening tests where only the sound is involved, not the rest of your senses.
You don't believe me? Allow me to call my expert witness who has shown up in this thread, AJ (Soundfiled). This is what he had to say on discussion of whether an external DAC improves the sound of an Oppo player: https://www.avsforum.com/threads/using-oppo-bdp-95-as-source-is-outboard-dac-going-to-make-a-difference.1389093/page-2
"Then you don't need to spend more than $100 to replace your presumably failing/broken Sony BDP. If transparent audio signal transfer is your concern."
[...]
"I didn't say that [that two dacs don't sound different]. My position is that I don't see any evidence whatsoever to support the notion that it does. And no, the blathering of ignorant crazy people and fabricated "tests" online isn't evidence to support superior DAC sound. It's evidence to support ignorance, craziness and truly infantile and sad resorts, like fabrications."
AJ, you want to take over from here? Strange to see you silent given how much you hate stuff like this.