MU1

“The MU1 is the ultimate digital music source: attractive, reliable and precise”

With the MU1, our goal was to set a new benchmark in music player design. The Linux-based computer system brings solid data integrity. Our in-house-designed FPGA interface board, which forms the heart of the MU1, offers breakthrough performance levels in format conversion and receives automatic updates whenever we have pushed the boundaries again. Needless to say, the MU1 features our trademark ultra-low jitter clock. This is a music player worthy of the name Grimm Audio.

Once excellent sound quality is ensured, the quality of a music player is then defined by the user experience. For this, we partnered with Roon Labs, who in our opinion are in the lead when it comes to a rich and engaging music experience that appeals to your whole family. The MU1 runs the Roon Server, so no extra installs are necessary. Just pick up your tablet and experience the music. For customers who prefer to only run a simple playback system without Roon’s extras, we offer a UPnP renderer function and Tidal Connect. 

The MU1 combines seamlessly with the LS1 playback system. Of course, the virtues of the MU1 can also be realized with DACs from other manufacturers. Because we love to create a stunning look for our equipment, the boundlessly versatile system is housed in a cabinet of minimalistic elegance, so the MU1 will easily become the gem of your living room.

I give the the MU1 6 of 5 possible stars in sound quality. An amazing device!

Wieland Hornig, Berlin (MU1)

Grimm Audio MU1

2019-07-04T12:32:18+00:00

Wieland Hornig, Berlin (MU1)

I give the the MU1 6 of 5 possible stars in sound quality. An amazing device!

https://www.grimmaudio.com/testimonials/wieland-hornig-berlin-mu1/

The Grimm Audio MU1 manages to touch the essence of the music.

Jaap Veenstra, Alpha Audio, Haarlem (MU1)

Grimm Audio MU1

2019-11-12T11:16:08+00:00

Jaap Veenstra, Alpha Audio, Haarlem (MU1)

The Grimm Audio MU1 manages to touch the essence of the music.

https://www.grimmaudio.com/testimonials/jaap-veenstra-alpha-audio-haarlem-mu1/

The MU1 takes my breath away.

Leung Wing Lun, SuperAV, Shanghai (MU1)

Grimm Audio MU1

2019-11-12T11:19:37+00:00

Leung Wing Lun, SuperAV, Shanghai (MU1)

The MU1 takes my breath away.

https://www.grimmaudio.com/testimonials/leung-wing-lun-superav-shanghai-mu1/

Today we listened to nothing less than a true revolution in High End Audio listening.

Erwin Pakasi, Barendrecht (MU1)

Grimm Audio MU1

2019-11-28T15:13:55+00:00

Erwin Pakasi, Barendrecht (MU1)

Today we listened to nothing less than a true revolution in High End Audio listening.

https://www.grimmaudio.com/testimonials/erwin-pakasi-barendrecht-mu1/

The sound together with the LS1‘s is magical.

Thomas Pierburg, Kuala Lumpur (MU1)

Grimm Audio MU1

2019-11-28T15:16:38+00:00

Thomas Pierburg, Kuala Lumpur (MU1)

The sound together with the LS1‘s is magical.

https://www.grimmaudio.com/testimonials/thomas-pierburg-kuala-lumpur-mu1/

In the test, the MU1 played exceptionally fresh and transparent.

Philipp Sneckenburger, Hifi Einsnull, Duisburg (MU1)

Grimm Audio MU1

2019-12-16T16:49:56+00:00

Philipp Sneckenburger, Hifi Einsnull, Duisburg (MU1)

In the test, the MU1 played exceptionally fresh and transparent.

https://www.grimmaudio.com/testimonials/philipp-sneckenburger-hifi-einsnull-duisburg-mu1/

Whatever I play, the MU1 never disappoints and allows the DAC and the rest of the system to show their strength.

Rene van Es, Hifi.nl, Amsterdam (MU1)

Grimm Audio MU1

2020-01-17T16:54:49+00:00

Rene van Es, Hifi.nl, Amsterdam (MU1)

Whatever I play, the MU1 never disappoints and allows the DAC and the rest of the system to show their strength.

https://www.grimmaudio.com/testimonials/rene-van-es-hifi-nl-amsterdam-mu1/

I have never heard streamed music of any genre better, more authentic and more breathtaking.

Joachim Pfeiffer, Hifi Musik Journal, Wuppertal (MU1)

Grimm Audio MU1

2020-01-31T10:41:09+00:00

Joachim Pfeiffer, Hifi Musik Journal, Wuppertal (MU1)

I have never heard streamed music of any genre better, more authentic and more breathtaking.

https://www.grimmaudio.com/testimonials/joachim-pfeiffer-hifi-musik-journal-wuppertal-mu1/

The device activates the hug hormone.

Ruud Jonker, Hifi.nl, Amsterdam (MU1)

Grimm Audio MU1

2020-02-21T16:13:40+00:00

Ruud Jonker, Hifi.nl, Amsterdam (MU1)

The device activates the hug hormone.

https://www.grimmaudio.com/testimonials/ruud-jonker-hifi-nl-amsterdam-mu1/

The MU1 transforms CDs into terrific source material!

Bart, Kortrijk (MU1)

Grimm Audio MU1

2020-02-22T16:35:25+00:00

Bart, Kortrijk (MU1)

The MU1 transforms CDs into terrific source material!

https://www.grimmaudio.com/testimonials/bart-kortrijk-mu1/

In conclusion we can only call the Grimm Audio MU1 a statement effort in digital audio.

Henk & Marja, 6Moons, Westport (MU1)

Grimm Audio MU1

2020-04-09T10:35:05+00:00

Henk & Marja, 6Moons, Westport (MU1)

In conclusion we can only call the Grimm Audio MU1 a statement effort in digital audio.

https://www.grimmaudio.com/testimonials/henk-marja-6moons-westport-mu1/

It was more real. Basta.

Bart, Audio Afficionado (MU1)

Grimm Audio MU1

2020-09-03T14:07:27+00:00

Bart, Audio Afficionado (MU1)

It was more real. Basta.

https://www.grimmaudio.com/testimonials/bart-audio-afficionado-mu1/

The MU1 still delivers one of the most musical sounds I’ve heard from digital to date.

Andrew Everard, HifiNews, UK (MU1)

Grimm Audio MU1

2026-07-05T18:58:59+00:00

Andrew Everard, HifiNews, UK (MU1)

The MU1 still delivers one of the most musical sounds I’ve heard from digital to date.

https://www.grimmaudio.com/testimonials/andrew-everard-hifinews-uk-mu1/

Well it’s the craziest thing. Ever since my Grimm MU1 showed-up here, all these incredible-sounding jazz groups keep showing-up in my living room and begin playing all the songs that I love. The thing is, I have no idea how they even got in here!

Dave Brazzle, Chicago, US (MU1)

Grimm Audio MU1

2026-07-05T19:05:00+00:00

Dave Brazzle, Chicago, US (MU1)

Well it’s the craziest thing. Ever since my Grimm MU1 showed-up here, all these incredible-sounding jazz groups keep showing-up in my living room and begin playing all the songs that I love. The thing is, I have no idea how they even got in here!

https://www.grimmaudio.com/testimonials/dave-brazzle-chicago-us-mu1/

Thank you for producing such a great product. It has made a tremendous difference in the system.

Allen Martin, Wayzata, US (MU1)

Grimm Audio MU1

2026-07-05T19:05:56+00:00

Allen Martin, Wayzata, US (MU1)

Thank you for producing such a great product. It has made a tremendous difference in the system.

https://www.grimmaudio.com/testimonials/allen-martin-wayzata-us-mu1/

That was love at first sound and second sight. Never heard a system that gets better and better as you listen longer and longer. It's an absolutely joy-machine for deep diving into music, thanks a lot for creating this future icon.

Björn Molt, Berlin, Germany (MU1 & LS1)

Grimm Audio MU1

2026-07-05T19:07:27+00:00

Björn Molt, Berlin, Germany (MU1 & LS1)

That was love at first sound and second sight. Never heard a system that gets better and better as you listen longer and longer. It's an absolutely joy-machine for deep diving into music, thanks a lot for creating this future icon.

https://www.grimmaudio.com/testimonials/bjorn-molt-berlin-germany-mu1-ls1/

I am completely amazed at what the MU1 does.

Sicco Schets, Eindhoven, The Netherlands (MU1)

Grimm Audio MU1

2026-07-05T19:08:21+00:00

Sicco Schets, Eindhoven, The Netherlands (MU1)

I am completely amazed at what the MU1 does.

https://www.grimmaudio.com/testimonials/sicco-schets-eindhoven-the-netherlands-mu1/

The MU2 is the benchmark of honest neutrality.

Daniel Březina, Hi-fi Voice, Czech Republic (MU2)

Grimm Audio MU1

2026-07-05T19:23:42+00:00

Daniel Březina, Hi-fi Voice, Czech Republic (MU2)

The MU2 is the benchmark of honest neutrality.

https://www.grimmaudio.com/testimonials/daniel-brezina-hi-fi-voice-czech-republic-mu2/

Music with which I have had decades-long relationships was rendered as virtually new and unexplored.

K.E. Heartsong, Audio Key Reviews, US (MU2)

Grimm Audio MU1

2026-07-05T19:25:21+00:00

K.E. Heartsong, Audio Key Reviews, US (MU2)

Music with which I have had decades-long relationships was rendered as virtually new and unexplored.

https://www.grimmaudio.com/testimonials/k-e-heartsong-audio-key-reviews-us-mu2/

It had a seductive combination of high resolution and relaxed ease that I found immensely involving.

Robert Harley, The Absolute Sound, US (LS1c & MU1)

Grimm Audio MU1

2026-07-05T19:34:28+00:00

Robert Harley, The Absolute Sound, US (LS1c & MU1)

It had a seductive combination of high resolution and relaxed ease that I found immensely involving.

https://www.grimmaudio.com/testimonials/robert-harley-the-absolute-sound-us-ls1c-mu1/

Usually, there is a trade-off between musicality and detail, yet somehow the MU2 conjures up the magic to have it all.

Eric Teh, Stereonet, Australia (MU2)

Grimm Audio MU1

2026-07-05T19:37:20+00:00

Eric Teh, Stereonet, Australia (MU2)

Usually, there is a trade-off between musicality and detail, yet somehow the MU2 conjures up the magic to have it all.

https://www.grimmaudio.com/testimonials/eric-teh-stereonet-australia-mu2/

That is what it’s all about: the equipment in service of the music.

Martijn ten Napel, Alpha Audio, The Netherlands (MU2)

Grimm Audio MU1

2026-07-05T19:38:45+00:00

Martijn ten Napel, Alpha Audio, The Netherlands (MU2)

That is what it’s all about: the equipment in service of the music.

https://www.grimmaudio.com/testimonials/martijn-ten-napel-alpha-audio-the-netherlands-mu2/

The impression of its crisp, sweet and high-resolution sound lingered in my mind – a sound that truly delights.

Jack Liu, Audio Art, Taiwan R.O.C. (MU2)

Grimm Audio MU1

2026-07-05T19:39:54+00:00

Jack Liu, Audio Art, Taiwan R.O.C. (MU2)

The impression of its crisp, sweet and high-resolution sound lingered in my mind – a sound that truly delights.

https://www.grimmaudio.com/testimonials/jack-liu-audio-art-taiwan-r-o-c-mu2/

I’m confident that for my tastes and needs and desires, I now have one of the best digital sources that money can buy.

Ola Björling, Ukiro Music, Sweden (MU2)

Grimm Audio MU1

2026-07-05T19:41:36+00:00

Ola Björling, Ukiro Music, Sweden (MU2)

I’m confident that for my tastes and needs and desires, I now have one of the best digital sources that money can buy.

https://www.grimmaudio.com/testimonials/ola-bjorling-ukiro-music-sweden-mu2/

As far as musical values go, this one is a winner.

Tom Martin, The Absolute Sound, US (MU2)

Grimm Audio MU1

2026-07-05T19:42:38+00:00

Tom Martin, The Absolute Sound, US (MU2)

As far as musical values go, this one is a winner.

https://www.grimmaudio.com/testimonials/tom-martin-the-absolute-sound-us-mu2/

The best DAC I’ve ever heard…

John Darko, Darko Audio, Germany (MU2)

Grimm Audio MU1

2026-07-05T19:43:47+00:00

John Darko, Darko Audio, Germany (MU2)

The best DAC I’ve ever heard…

https://www.grimmaudio.com/testimonials/john-darko-darko-audio-germany-mu2/

Without doubt one of the very best maestros of digital and analog that can be found.

Bruno Castelluzzo, Haute Fidélité, France (MU2)

Grimm Audio MU1

2026-07-05T19:45:03+00:00

Bruno Castelluzzo, Haute Fidélité, France (MU2)

Without doubt one of the very best maestros of digital and analog that can be found.

https://www.grimmaudio.com/testimonials/bruno-castelluzzo-haute-fidelite-france-mu2/

It sounds fast and crisp then rich, vibrant and soulful.

Andrew Everard, HiFi News, UK (MU2)

Grimm Audio MU1

2026-07-05T19:46:22+00:00

Andrew Everard, HiFi News, UK (MU2)

It sounds fast and crisp then rich, vibrant and soulful.

https://www.grimmaudio.com/testimonials/andrew-everard-hifi-news-uk-mu2/

The Grimm MU2 is the purest true-to-life music reproduction from digital streaming.

John Hoffman, Stereo Times, US (MU2)

Grimm Audio MU1

2026-07-05T19:47:25+00:00

John Hoffman, Stereo Times, US (MU2)

The Grimm MU2 is the purest true-to-life music reproduction from digital streaming.

https://www.grimmaudio.com/testimonials/john-hoffman-stereo-times-us-mu2/

It was an experience filled with emotion.

Hijikata Hisaaki, Audio Accessory, Japan (MU2)

Grimm Audio MU1

2026-07-05T19:48:14+00:00

Hijikata Hisaaki, Audio Accessory, Japan (MU2)

It was an experience filled with emotion.

https://www.grimmaudio.com/testimonials/hijikata-hisaaki-audio-accessory-japan-mu2/

The Grimm MU2 is a bang-up success.

Kalman Rubinson, Stereophile, US (MU2)

Grimm Audio MU1

2026-07-05T19:49:22+00:00

Kalman Rubinson, Stereophile, US (MU2)

The Grimm MU2 is a bang-up success.

https://www.grimmaudio.com/testimonials/kalman-rubinson-stereophile-us-mu2/

The Grimm Audio MU2 is a solution for the ages, or at least our current age.

K.E. Heartsong, Audio Key Reviews, US (MU2)

Grimm Audio MU1

2026-07-05T19:50:38+00:00

K.E. Heartsong, Audio Key Reviews, US (MU2)

The Grimm Audio MU2 is a solution for the ages, or at least our current age.

https://www.grimmaudio.com/testimonials/k-e-heartsong-audio-key-reviews-us-mu2-2/

The Grimm MU2 is a real magnifying glass, that brings you even closer to the truth of the recording.

Joël Chevassus, Audiophile Magazine, France (MU2)

Grimm Audio MU1

2026-07-05T19:52:00+00:00

Joël Chevassus, Audiophile Magazine, France (MU2)

The Grimm MU2 is a real magnifying glass, that brings you even closer to the truth of the recording.

https://www.grimmaudio.com/testimonials/joel-chevassus-audiophile-magazine-france-mu2/

The longer I listen, the more apparent it becomes that the typical ‘mechanical sound’ that has characterized digital since the early days has largely disappeared!

Werner Ero, Music Emotion, The Netherlands (MU2)

Grimm Audio MU1

2026-07-05T19:52:56+00:00

Werner Ero, Music Emotion, The Netherlands (MU2)

The longer I listen, the more apparent it becomes that the typical ‘mechanical sound’ that has characterized digital since the early days has largely disappeared!

https://www.grimmaudio.com/testimonials/werner-ero-music-emotion-the-netherlands-mu2/

The MU2 is by far the most neutral digital source I have come across so far.

Martin Mertens, Fairaudio, Germany (MU2)

Grimm Audio MU1

2026-07-05T19:54:01+00:00

Martin Mertens, Fairaudio, Germany (MU2)

The MU2 is by far the most neutral digital source I have come across so far.

https://www.grimmaudio.com/testimonials/martin-mertens-fairaudio-germany-mu2/

The MU2 offers the best reproduction I’ve heard.

Michael Lavorgna, Twittering Machines, US (MU2)

Grimm Audio MU1

2026-07-05T19:55:34+00:00

Michael Lavorgna, Twittering Machines, US (MU2)

The MU2 offers the best reproduction I’ve heard.

https://www.grimmaudio.com/testimonials/michael-lavorgna-twittering-machines-us-mu2/

There is nothing else on the planet that I have come across yet that does a better job than this thing does.

Shane Stephenson, An Aussie Audiophile, Australia (MU2)

Grimm Audio MU1

2026-07-05T20:02:30+00:00

Shane Stephenson, An Aussie Audiophile, Australia (MU2)

There is nothing else on the planet that I have come across yet that does a better job than this thing does.

https://www.grimmaudio.com/testimonials/shane-stephenson-an-aussie-audiophile-australia-mu2/

The very best that my ears have heard to this date.

John van der Veer, hifi.nl and HVT, The Netherlands (MU2)

Grimm Audio MU1

2026-07-05T20:16:09+00:00

John van der Veer, hifi.nl and HVT, The Netherlands (MU2)

The very best that my ears have heard to this date.

https://www.grimmaudio.com/testimonials/john-van-der-veer-hifi-nl-and-hvt-the-netherlands-mu2/

Music with which I have had decades-long relationships was rendered as virtually new and unexplored.

K.E. Heartsong, Audio Key Reviews, US (MU2)

Grimm Audio MU1

2026-07-05T20:17:21+00:00

K.E. Heartsong, Audio Key Reviews, US (MU2)

Music with which I have had decades-long relationships was rendered as virtually new and unexplored.

https://www.grimmaudio.com/testimonials/k-e-heartsong-audio-key-reviews-us-mu2-3/

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Grimm Audio MU1