I have the LUMIN A1 which has an external power supply. It’s extremely quiet and has a very dynamic sound. The chassis is solid billet aluminum and gas pretty substantial weight to it. The app interface is pretty good and there’s occasional updates that automatically come via the network. I think the built in DAC is very good although you said you would prefer an outboard a DAC so you could get Lumins streamer only and use your DAC and I’m sure it will sound great. I think it sounds as good as my analog setup but it is different sounding.
Rick
Rick