How is your NVidia Shield TV Pro HDMI audio signal converted to feed MDave? Maybe the converter is the problem?That is funny, I was watching it yesterday and I thought it sounds really a bit better, although still almost no depth on my system, but quite a bit more musical. The service "joyn" has so much depth that I suddenly looked up (a bit shocked in a positive way) because I heard someone 10 meters away. It also sounds warm but lively.
I don't know why I hear compression artefacts sometimes as harshness/brittleness. Not really bright but hard somehow.
Uncompressed files with MDave I hear as very clear but also smooth and warm.
I connect my NVidia Shield TV to my Panasonic TV and then use the TV to convert it to 2-channel Toslink to feed M-Scaler.