In my system Quboz hirez files sounded very detailed but after about 2 hours listening fatigue set in and I just could not go back to using it. MQA through the Bluesound Node just sounds very relaxed like analog. Human voices sound almost like the person is in the room on good recordings like the recent re-releases of James Taylor and the Beatles. Once you get used to it most digital recordings (even in hirez) sound a little harsh in comparison to MQA. Don't get me wrong, if I never heard an MQA file I could likely get along very nicely in "hirez/redbook", but now I just prefer it.