To respond to your Question of why I suggest the Grimm MU & MU2 and what corresponding equipment I have:
I have had two configurations, one with the MU1 output into a MSB Discrete DAC and then just the MU2 as a Roon server, Streamer, DAC. My system consist of a VAC Master pre-amp, a Boulder 1160 power amp, a Thorens TD124 turntable, and Sonus Faber Amati G5 floor standers. I have a Shunyata Altaira grounding system. Most connections are balanced (a must for the Grimm products). I found the MU1/MSB-DAC combo to be the best digital sound I have ever heard (until the MU2). The sound is very full, detailed, and especially not harsh. I then traded the MU1 and for the MU2 and found even a richer, low noise sound. I have not yet tried the MU2 preamp directly into my power amp since I have the VAC Master pre-amp which overlays everything with a very harmonic layer due to its tubes.