There have been numerous evidence that the AES/EBU input of the Devialet, which is used when the Mutec MC-3+ USB is in the chain, is better than USB input. But there has not been any serious discussion about possible reasons why this could be the case.
Here: https://audiosciencereview.com/forum/ind...post-51389 is an interesting possible explanation.
Here: https://audiosciencereview.com/forum/ind...post-51389 is an interesting possible explanation.