I would like again to bring again to everyone's attention a very simple way to improve the SQ for the USB input of R2R11 for free.
The Amanero USB interface does not need power over the USB line and works flawlessly without it (have been using this for months already).
The easiest and easily reversible way to disconnect the power is to but a small piece of tape on pin 1 that carries the 5+V (picture below).
It makes more sense to do it on the USB A connector - i.e. the side of your source (PC/laptop/streamer)
I will not go into speculation why this works and has such positive effect but it does raise the SQ considerably.
It also decreases the loudness of the ïnfamous "pop" to negligible levels.
My guess is that this will work on all ADG DACs that have the Amanero Board.
You owe it to yourselves to give it a try!