What are you using as a streamer? Constructive feedback please.

Roon and Tidal is the core of my streaming. The signature system uses Roonbridge running on a Thinkserver 2016 with Audiophile Optimizer and separated USB card powered by a separate power supply and CA DAC magic Plus.  Just recently bought Bluesound Node 3rd generation, Pangea Power cable, Audioquest evergreen interconnects, Tripplite line conditioner, Project Carbon EVO turntable, NHT Zero, SVS SB-1000 SW, Carver Amp for a 2nd system and could not be any happier as to the performance of the BSN. BSN is hardwired with CAT6 to wall plugs and connected to two switches in the media room which serves the entire house.

My new Bel Canto E.One Stream came in while I was traveling this week will set it up tomorrow and see how it works with all my other BC gear.

Thanks for all the feedback.

A vote for LMS (Logitech Music Server) here. It integrates very well with Qobuz. I've got a collection of FLAC's on my Raspberry PI server also. I have cheap Pi's in two other rooms that feed other systems with good dacs. Interestingly, when listening on my PC, I can't tell the difference between direct Qobuz and playing through the streamer using an excellent dac/headphone amp with either my Beyer DT880 or Monolith Planars. The only downside that I can see is that it's not plug and play......

One of the big improvements of the Raspberry PI 4 was to separate the USB bus from the ethernet bus. Why?... Because of the noise of the shared bus.

Yep!  And its a big improvement.

On the 3 you had to build a HAT

Both USB and ethernet are connected to the same internal AMBA bus in the internal pi 4 processor. They didn't separate out things the processor in the pi 3 and 3b did not have integrated ethernet. The new processor has integrated ethernet and only requires an external phy. The old one didn't have ethernet so they use the chip that provided USB and ethernet together. Due to the reduced performance of the original USB I/F from the processor they could only do 300 mbps on the ethernet (3b+), 100mbps(3b). It had absolutely nothing to do with noise but about data transfer bottlenecks. In terms of noise they both use the same power supply which is where most of the noise will come from.