Grimm MU2 Experience

I have some interest in the Grimm MU2, which apparently serves the roles of:

• Server/Roon core
• Streamer/Roon endpoint
• DAC
• Analog preamp

Can users explain whether they have tried and found any sonic benefits (or not) to:

• Using a separate server/Roon core networked and located away from a user's music system, and thus using the MU2 only as the streamer/DAC/preamp?
• Using a separate preamp and not the onboard preamp?
• Using a unity-gain buffer on the preamp/volume control outputs, to improve the output impedance?

I cannot find any information/specifications about the on-board preamp, and whether it is a true preamplifier with gain (i.e., how much gain?), or simply a volume control as is the case with many volume controls inside of DACs.

I need to review more closely but would like to find more direct comparisons between the MU2 used as a DAC and other top DACs, i.e., how good is the DAC section?

I’m sure the MU2 is excellent, but that this level I’d want everything separate. 

@mitch2 

Alpha Audio reviewed it some time ago, and in the video I recall they said there was no disadvantage using the MU2 pre vs. their Pass Labs XP-12

Of course being from the same homeland they are biased 

MU2

I am glad to see this thread continued. I am about to purchase a new DAC/Streamer setup and the Grimm is on my short list along with EMM Labs, Weiss, DCS, and Linn.

@awise1961 

If a one-box solution appeals to you and you have the budget I would throw Playback Designs into that list