Is there really any audible advantage when using a separate streamer (FiiO/Eversolo/WiiM for example) as a Roon Bridge with USB output to a DAC versus the USB output from a MacMini or Nucleus One that is also running the Roon Server? The DAC in question also has galvanic isolation for USB.
There should be no difference.
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Interesting take: https://www.youtube.com/watch?v=YuagbK8p0FA
This is my “away from home” setup running Roon server and client on my Dell laptop with the iPads and my iPhone providing the cellular data and router function. I don’t like a direct USB connection of the Mojo 2 to the Dell. Say what you will, but the Dell USB is audibly noisy. The RPi4 is dead quiet. The computer and RPi4 connect via WIFI.
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I recall several years back (before Roon) when I had my music on a Windows PC. The spinning hard drive was clearly audible on the USB output. I don’t know if there is less noise now with SSD’s, but I use RPi’s as endpoints with my Rock Nuc.