Is the Weiss used as endpoint Roon? Or is the Nucleus playing direct into the dac? Is there a difference in sound quality between these options? If I understand correctly one would not need a streamer just a roon server with weiss 501.
Weiss is used as Roon Ready, receiving the music via its network input. With Weiss, the Roon Ready input sounds much better than via its USB from Roon Nucleus. Nucleus’ USB out is just an standard USB 3.0 port on a NUC, no isolation whatsoever.