Yep …. No surprise here.
My brand new MOON 280D MiND2 streamer/DAC manual highlights 400hrs as the recommended break-in period, during which audio performance will improve.
Now being about a quarter way through it to date…. Yup …. There is a distinct progressive audio improvement to date, and experienced in steps. It has not been a linear experience, but rather in a ad hoc series of steps.
I leave it on full time at least for now, even when I’m not playing tunes through it.