Jerry, on the router I would say bandwidth is the most important. Just make sure it supports a high bitrate and you should be fine.
From my experience the storage or NAS is more important, as it potentially introduces all kinds of noise into the audio chain. I just went from an Aurender to a dedicated NAS with a Roon Core a couple months back and am very happy with the results. But a mom&pop NAS won’t do, if you want to run a Roon Core on it. You need to make sure it has a powerful enough processor and all the RAM you can get. And you need a dedicated SSD to install the Roon Core on and cache your music library. I do have a separate SSD for Roon and for the cache. Roon puts any album you play on on the SSD cache for playback, so you do not have to play your music from a rotating disc which would introduce rumble and vibration (an Aurender does the same). Advantage of a NAS is you do not have to pay ridiculous amounts for simple storage, as with an Aurender, Melco or Baetis Audio etc. I do have 24 TB (18 with RAID on the main drive), you can’t even get anything close to that with a music server. A Nucleus is basically a dedicated NAS for Roon, there just are less options for customizing.
Also, it makes sense to invest in high quality Ethernet cables between router/ NAS and router/ DAC, as you will immediately hear the difference. I use AQ Vodka and find them quite good.
Andrew, I also do have a linear PSU powering my NAS and am using a Shunyata cable + power filter to feed it. For that I had to have a 4-PIN connector cable custom made to connect the LPSU to the NAS. I find replacing the inbox wallwart gives the music a better jump factor and better dynamics.
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