Sound differences between Devialet 200 and Devialet 250

[thumb5]

...
Whatever, the evidence seems to be that if you plug a superior DAC into the Devialet via analogue input, you will hear the superiority of that DAC over the Devialet's one.
...

Wouldn't it be more accurate to say that if you plug a DAC with a known sound signature into the Devialet, the sound signature is preserved by the Devialet? (Not that I've done the experiment.) That could be equivalent to what you said, depending on what you mean by "superior".