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Good point, Good point, "Off the shelf USB power packs use a switching regulator to make 5V from the battery voltage", which could reintroduce noise that you were trying to reduce. You would need the battery directly connected to a linear power supply and bypass the switching regulator.

I am considering building a Raspberry 4 streamer with a DAC hat or separate board of some kind. It would be nice to have a small combined streamer and DAC. I believe one of the main issues with having a DAC in the same box is perhaps power supply noise coming from the wall USB switching power...

Hi All, I am new to the group. I am very impressed with the group's activity and outstanding technical content. For the about 7 years I been exploring WiFi audio with the goal of a home filled with mood enhancing music. My audio setup runs Roon on a QNAP NAS drive which casts to around 8...