Apparently Filter 3 is perfect. I like 6 for some reason.I replaced my iFi nano with the C200 and couldn't be happier. After just two years, the iFi started randomly losing a channel or outputted no audio, possibly due to a problem with the small toggle switch (which I rarely used). Also, it had a ground loop issue with my new monitors and that disappeared with the C200, even when using the unbalanced RCA outs.
Question: the C200 offers a choice of six filters. Is there a preferred one? I listen to CDs, wav files, and Spotify?
Also, I, too, wish the display defaulted to volume.