Point of diminishing returns for a Network Streamers?

Interesting topic.

However, IMHO, the discussion is quite haphazard as, perhaps, our forum knows a lot more about amps, preamps, analog sources, than perhaps the new digital stuff.

I’d suggest we first zone in on what qualities are important in a streamer. Decide on what attributes are really important rather than just naming the names of the 5000 or so streamers available. Then, name the streamers with the attributes that we feel are important towards improving SQ.

Does using a good linear power supply generally help? Is one better off with some PC / Mac running Windows / MacOS or should one use a barebones computer (like a NUC running Roon Rock)? Is galvanic isolation important? Should the streamer be connected to the DAC directly via a cable? If so, which kind of cable (this might be DAC-dependent)? Or should it go through via a network bridge (as Roon calls it) or a Network Audio Adapter (as HQPlayer calls it)? If so, then should the bridge be connected to the streamer via ethernet? Is there a benefit to using fiber optic cables instead (perhaps, using a device such as an opticalRendu)? If so, do ’audiophile grade switches’ make a difference? Should one use a reclocking device to improve jitter performance? Does using a good power cord into a source component (like a streamer and a DAC) make a bigger difference than using a good power cord into a downstream component (like a power amplifier)? Would my streamer need a good power cord? Does the quality of cable connection between the streamer --> network bridge / NAA or streamer --> DAC matter? Does the length of the cable & / or impedance matter?

Yes a linear power supply is a definite plus.  I have a Lumiin U1 Mini and with the external power supply, it is a great product for streaming.  May upgrade at some point later but for now but very happy with the Lumin.  Nice sound stage, good depth and width.  Good micro detail especially on the hi res stuff.  Using Qobuz as the source.  

You may want to also check out the Primare Prisma NP5 MKII music streamer.  Relatively low cost at $750 and easy set up using ethernet or wifi.  I found it a big improvement over my MacBook Pro using USB into my Esoteric DAC.  More detail, depth and bass.  It does not have USB connection but I found the coaxial connection just as good.  Can easily stream Tidal using MacBook or IPad as the controller.

The quality of your DAC's USB is critical here! My DAC has Galvanic Isolation, and this makes a big difference. 

@lalitk "Given your rest of your system, I am not at all surprised by the very small improvement from U1 Mini. "

You mean my humble system? 🤣 Well when I can afford Genelec 8351B some day, I’ll invest in a Lumin setup... for now the Lindemann Limetree Bridge II is a fabulous sweet spot when paired with  a capable preamp/DAC like RME.