The Audio Engine piece I referred to has a high quality Bluetooth adapter/DAC, I believe it's called Apt x. I'm not sure how high the resolution goes. I'm sure it at least does Lossless, my friend streams the high qulity Tidal from his phone to the Bluetooth in a Cary DAC which also has that Apt-X.

USB does high resolution, that's what most of my friends use who are into computer based audio.

Seems the Bluetooth, being wireless would be the most convenient if it has the bandwidth you want.

You show using RCA to speakers, do they have amplification built in? If so, you don't need the other amp.