Audio Science Review of Expert 200.

[Confused]

Slightly confusingly though the plot done by Amir after the unit was repaired (https://www.audiosciencereview.com/forum...ost-399323) looks to be on the optical input as opposed to the USB input show (left graph on @Confused 's post above. Ideally though, there shouldn't be a lot of difference between the two inputs.  I guess that does show the optical input isn't too shabby though.

Good spot Rufus!  Checking back at ASR, I see that you are absolutely right.  So, this gives us a comparison of two different inputs, with a degree of doubt as to if the amp tested via USB was working correctly.  Difficult to reach a definitive conclusion from that!  Interesting though, maybe the optical input does actually have lower noise versus the USB input? No reason why not.

Maybe Amir is confused?  Now there is a disturbing thought.