Hello @Wakajazz ,
We unfortunately do not have the Sony NW-A45 in-house as a part of our Roon Tested program, so we cannot be certain what level of MQA functionality of the device and on what inputs it supports MQA. What operating system is the computer that you connecting the Sony NW-A45 to running? What happens when you play to the device using the Tidal desktop app using “Exclusive Mode”? If you are unfamiliar with how to configure the Tidal desktop app for exclusive mode, I’ve included the instructions below.
-John