Grimm MU1 Streamer - Really "The Best"?


I've recently become interested in the Grimm MU1.  While reviews of top end players from Innuos, Aurender and Antipodes and others are typically all very positive, the tone of the many pro reviews of the Grimm MU1 go far, far beyond, with some reviews resorting to using superlatives and gushing of positive system transformation and not being able to stop listening to material, etc..  HiFi Advice and Steve Huff (actually calls it "magic") have such reviews.

Given the delay in availability of the Innuos Pulsar which I'm told will be better than my current Zenith Mk3 + PhoenixUSB reclocker, I am interested in replacing my streaming setup with a one-box solution that includes a high-precision clock.  The new streamer will continue to feed my Gryphon Diablo 300's DAC module, which I have no interest in replacing.

I'm actually a fan of Innuos, after they improved the sound of my Zenith with firmware updates and after I added their PhoenixUSB reclocker. I appreciate this commitment to improving sound quality which is why I was so interested in the Pulsar.

The trigger for considering an upgrade is not for improved sound, but rather, to solve some issues I have with too many Audioquest power cords coiled and clumped together. I will get to lose one of them and one of my USB cords with a one-box streamer. I've noticed my sound is very sensitive to positioning of my AC cords and find I often need to re-adjust the PC feeding my amp to get proper sounding vocals at center stage.  One of my subs also seems to be picking up AC noise when the crossover is set above 60Hz. The second trigger is simply system simplification, removing one box.  All that said I don't really have any complaints regarding sound, and the PhoenixUSB reclocker truly did improve the sound of my Zenith.

While the Grimm MU1 has it's 4X upsampling up it's sleeve with reviewers absolutely glowing over this feature and it's extreme ability to separate tones to the left, right, front, and back far better than the rest, I don't see that Grimm has gone to any lengths with regard to power supply management in the way other brands do including Innuos. The MU1's ultra-simplistic interior doesn't bug me, but the lack of transformers and power management makes me wonder....

Are there any updates from folks who have directly compared the MU1 vs similarly classed streamers from the competition?  Did you find it to be as revelatory as the pro reviewers found it? And, how does it compare to other streamers with it's 4X upsampling disabled?  Does it sound like it suffers from it's lack of power management?  I do see that the clock should be very good...

 

 

nyev

@charles1dad 

Thanks for the question, the Muon streaming system is not necessary with the Grimm. It dramatically improves the Innuos, it seems the Grimm doesn’t need the “help”. The Muon system is also very effective if utilizing the inboard streamer on the Totaldac, less so when I also had a Maitner MA3. I think I briefly posted elsewhere that, since I already own the Muon system that I would just leave it in the chain…sortof like a belt and suspenders but I just dont hear any improvement to speak of when using the Muon with the Grimm. Thats another reason I enjoy the ownership experience with the Grimm. I find that it is agnostic to a degree with all the audiophile nervosa moves we all obsess over.  Power cable, ethernet cable, etc, etc. I have not tested. Many aes/ebu cables…just a Black diamond from Tellurium Q and the SHunyata Sigma V2.

 

@nyev Since I’m not a reviewer, my exercise was to determine what I preferred in my system. No controls, no real validity for others I guess. The ratings that I arbitrarily listed as well should have no bearing on the decisions of others as they may decide otherwise. With that said, the Innuos reclocker that you have elevates the Zenith to something more akin to “statement light” level. I did not discuss the effects of cables with the Zenith but I was using a Final Touch Audio Sinope USB cable, which I had chosen some time prior as my preference. I also want to point out that I had AQ Vodka ethernet cables (which I preferred to the Diamond) and I also have several Totaldac ethernet cables/filters. One VERY important factor that I didnt mention, which I believe provided material assistance to the Innuos, was that since I didnt find the Muon system to be necessary with the Grimm, I used it with the Zenith. That might explain the “base” Grimm and the “tweaked” Innuos Zenith performance gap being so close. Also, when writing the above I wanted to be careful when assigning some arbitrary score to the Grimm and the Zenith to intentionally not overstate some wide margin between them. The Grimm is better sounding without upsampling than the “tweaked” Zenith to my ears. The Grimm also accomplishes something you have as a stated goal; simplicity, fewer cables, etc.

 

I really do think the Grimm is a far better choice for many people than the vast majority of server/streamers out there anywhere near its pricepoint. The data into the Grimm is unfussy so a competent ethernet cable in is really all you need. All the gyrations of special switch this and fiber to copper to fiber to copper to external box BS..completely unecessary. So the Grimm must be dealing internally with a great deal of what we believe needs to be addressed with the ethernet stream. CHECK. Next up, the Grimm’s internal clocking IS superior to my ears and given that the AES/EBU is the output of choice from the Grimm, it will improve the clocking of virtually any reasonable consumer DAC. CHECK. I also find that the Grimm as a Roon core is a bit more equipped for the job that the Zenith. Anyone who has owned a Zenith knows that a periodic reboot is necessary be it to improve responsiveness or the rare but occasional lockup. No such issue with the Grimm. CHECK.

 

So, the summary…the Grimm is cable/filter agnostic, sounds great, it utilizes the superior Roon user interface seemingly without the perceived Roon sound challenges mentioned by some. I happen to believe that Roon has largely dealt with sound quality degradation in previous iterations, it just takes people a while to recognize that previous opinions have a shelf life of validity with a constantly updated software platform. I also believe the Grimm intercepts the stream before Roon owns the data, but that is a hypothesis on my part. Plug and play, rock solid operation and for those who still spin disks, the best part is you plug in your transport to the Grimm and you get all the upsampling and clocking benefits. The volume control is a joy to use audibly and physically. Now, if you happen to like the tweaky nature of setups we so often read about, then the Grimm may not be for you. I’m not saying there isnt some minute improvement to be had by those willing to go to the lengths and try everything imaginable when it comes to filters/cable/fiber coversion/reconversion/linear power supplies powering half a dozen different thingamajigs. Hey, Ive been there but that commenced at a time where we HAD to experiment to achieve a certain level of performance. With the Grimm, its just not necessary.

 

So, with the Grimm….imagine how much fun it is to plug it into your mains with a reasonably generic power cable, plug it in to your ethernet switch with a reasonably generic ethernet cable, plug it into your reasonably generic dac with a reasonably generic AES/EBU cable and you are done. This level of performance is all possible without all of the fussy, tweaky stuf of which we all grow so tired. Good luck on your journey @nyev as there are so many good products available today from which we may all choose.

 

As a fly by comment, I have spent time with the Diablo with the inboard dac. It is a solid dac and the Grimm clocking will take it to another level you didnt think was possible. What is possible today with USB is terrific and it has come a long, long way…but the logical side of your brain would have to conclude that the clocking on your dac is an absolute bottleneck and places a hard ceiling on what is possible with your sound quality potential. The Aurender and the Grimm either one would address that by enabling you to use the AES input. If that is your present path, alot of goodness awaits.

@ghasley 

Thanks for your last post, very informative and helpful in understanding why you preferred MU1 over Innuos and Aurender. I don't mean to beat a dead horse but my stance on upsampling was based on my extended listening with four different DAC’s in the price range from $8K and $25K. To my ears, upsampled files did not sounded natural and often produced some level of distortion. As of now, ROON doesn’t support native DSD files. And since they are using ROON as OS so a sample rate conversion (both upsampling and downsampling) by way of “Pure Nyquist” decimation filter appears to be a smart choice. If anything, you achieve greater consistency across the board by listening in 2FS or 4FS mode. 

In any case, MU1 is not something I would not consider…I have a large library of DSD and analog files that I prefer to hear natively. In my system, Aurender serves my needs beautifully by allowing me to hear files without any post processing and not to mention unparalleled RAVENNA integration with my Merging DAC over Ethernet.

Like you said, which server/streamer is best? The one that meets your goal. 

Totally agree with @adasdad. My experience is that investing in the best sounding DAC you can afford will give you the greatest listening pleasure.

@ghasley 

I still listen to Roon on my Innuos Zenith to compare with Sense.  Roon still sounds much less enjoyable.  Really not even close. I compared the most recent versions of Sense and Roon and simply find Roon is still far behind sonically. Keep in mind I do not use DSP and don’t tax my Zenith at all.  It has never locked up or needed to be cycled off/on.  It has run flawlessly at all times in my home even when I primarily used Roon a couple of years ago. 
 

I demoed the PhoenixUSB Reclocker in my system for two weeks and ended up returning it.  It simply did not offer a perceptible improvement in sound quality when used with the Mojo Audio Evo Pro dac I had at the time.  I actually preferred the Zenith on its own with the Mojo Audio dac. Just more at ease and natural sounding.   I was rather shocked at this outcome, but it just reinforces the important role various systems and preferences play in our choices.  
 

I must say your comments on the Grimm has me wanting to listen to one in my system. The problem is I spent so much on my Tron dac that another $11 grand on the server is not possible. I suppose I opted to spend much more on the dac vs the server. With the Grimm unit I sense one can spend less on the dac and get a great outcome.  Interesting. 


 

 

Like you said, which server/streamer is best? The one that meets your goal.

@lalitk and @ghasley

Unquestionably you have respectively accomplished this goal .

Charles