It is designed toconnect to any DAC and transform its performance.
What really makes theMU1 different isn’t so much that it’s a hub with a Roon core although that’spretty cool, what really counts is what it does with the digital signals it receives and how it connects with the DAC. The reason that Grimm use AES/EBUover XLR is that this connection allows the clock signal to be sent alongside the data (to the DAC), and the electronics inside the MU1 are designed to provide an extremely low jitter signal based on the clock rate of the source, be that Roon or anything else. It slaves to the incoming clock rate, reduces the jitter and sends the same clock signal to the DAC.
This is the most exciting streamer I have heard for a long time.
It has an analogue warmth and a presence that is reminiscent of good vinyl replay
It engages the senses like a great vinyl pressing and that doesn’t often happen with digital in mylistening room.
I also tried a digital input by connecting the coax output of a Rega Saturn-R CD player to the DAC direct and then putting it through the Grimm. This was a real eye opener because the soundstage opened up to reveal what was going on to such an extent it was hard to believe that this was the same CD player. With another disc, Terry Callier’s Timepiece, it really brought out the vocal and revealed texture in the heavy bass, making the direct to DAC version sound flat by comparison.
It’s addictive; I’m not sure how I’m going to adapt to real world digital sources when it’s gone.
I have not heard abetter streamer than this so the price while high is warranted by the sound quality produced.
In summary the GrimmMU1 is a major contribution to road safety, no music lover who hears it will be able to leave the sweet spot unless it’s for a genuinely essential journey.