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Grimm Audio MU2
We are convinced that smart integration of functions yields higher audio quality. The MU2 combines a music streamer with a superb DAC and a reference quality analog pre amp. Its built-in DAC takes full advantage of the Grimm Audio low jitter clock and high performance FPGA processor. A relay based analog volume control enables the MU2 to become the true ‘hub’ of your hifi system for both digital and analog sources. Just like with its sister product, the ‘digital output’ MU1, a Roon Labs server is on board so no external computer is needed to enjoy perfect streaming.
At the heart of the MU2, Grimm Audio’s proprietary Major DAC can be found. It is of a groundbreaking discrete design that makes optimal use of our own FPGA board. In a unique way our high resolution Pure Nyquist upsampling filters are combined with a fundamentally flawless 11th order noise shaper of 1.5 bit. If you like to read more about this technology, please check out the Major DAC blog
As a result the MU2 reproduces micro-details so well that it allows a deep emotional connection to the musical performance. The stereo image is of groundbreaking quality. Its serenity invites prolonged listening sessions.
If you love your loudspeakers and power amplifiers but long for a fundamental update in sound quality and streamer experience, the MU2 is designed for you.
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Professional Reviews 93/100
Deliciously Crispy
Sound Quality
96/100
Build Quality
89/100
Features Usability
89/100
Value for Money
91/100
Grimm Audio MU2 turns a streaming front end into a natural, relaxed and deeply resolved control centre. Its FPGA-based Major DAC, ultra-low-jitter clocking and relay analogue preamp deliver crisp transients, weighty bass and an open, finely etched soundstage. HiFi News found exceptional drive and detail, while its integrated Roon server and extensive connectivity make the one-box concept genuinely reference-grade.
What Reviewers Are Saying
Pros
Exceptional resolution, natural musicality and freedom from digital edge.
Fast, weighty and sharply focused bass with expansive, precisely resolved imaging.
Versatile all-in-one platform: Roon server/endpoint, DAC, analogue preamp, headphone output and broad analogue/digital connectivity.
&
Cons
Roon newcomers may face a steeper learning curve, particularly when using the top-panel control wheel.
The neutral, open presentation may not suit listeners seeking overt warmth.
SOUND QUALITY PERFORMANCE 96/100
Reviewers consistently describe an unusually natural, fluid and musically involving presentation, combining exceptional resolution with substantial tonal weight and freedom from digital edge. Its clocking and processing are also credited with cleaner transients, lower apparent noise and a notably relaxed sense of timing.
Overall Sound
96/100
HiFi News heard drive, weight, sharp focus and a finely etched, free-breathing stage, while Alpha Audio found the presentation fluid, natural and neutral rather than conventionally warm. Audiokey Reviews and Hans Beekhuyzen both praised its exceptional transparency, natural voices, controlled bass and immersive musicality.
Digital Signal Integrity
96/100
Grimm specifies an exceptionally low-jitter clock, FPGA-based processing and reclocking, and HiFi Advice details careful clock measurement, upsampling and noise shaping. In listening, The Absolute Sound heard transient structure, shimmer and decay emerge without grit, while Hans Beekhuyzen specifically credited reclocking and jitter suppression with a marked improvement from connected digital sources.
FEATURES USABILITY PERFORMANCE 89/100
The MU2 combines a capable Roon-based server/streamer platform with extensive analogue and digital system integration. It is widely described as easy to deploy once connected, although newcomers to Roon may need a little time to become comfortable with the interface.
Streaming Software
88/100
Integrated Roon Server and Roon Ready endpoint functionality, Tidal and Qobuz access, UPnP support and browser-based setup make the MU2 a well-equipped music-library and streaming hub. Audiophilepure called the ergonomics flawless and Audiokey found it plug and play, but HiFi News notes that Roon can take some getting used to for first-time users.
Features Connectivity
92/100
The MU2 supports internal or external/NAS storage, network playback and a broad set of digital inputs including AES, coaxial and optical. Balanced and unbalanced analogue inputs and outputs, relay volume control and a headphone output let it work as a direct preamp, DAC and streaming front end in a wide range of systems.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
89/100
The compact, understated chassis is described as simple and elegant, while the internal design includes separately regulated, high-isolation power supplies for sensitive circuitry. Reviewers also note the fully analogue relay-based volume path, though there is limited direct commentary on long-term physical durability.
Value for Money
91/100
At roughly €18,000 to €20,600 before storage options, the MU2 is undeniably costly, but several reviewers argue that its consolidation of server, streamer, DAC and analogue preamp functions makes the price more persuasive. Hans Beekhuyzen called it a bargain against a preferred MU1/DAVE combination, while Audiokey found competing integrated solutions at far higher prices unable to match it.
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Authorized dealers for Grimm Audio MU2
- The Audio Association — in-store — Anaheim, California, United States (website)
- American Sound — in-store — Richmond Hill, Ontario, Canada (website)
- Atelier 13 Audio — in-store — Forest Hills, Tennessee, United States (website)
- Audio Archon — online and in-store — Libertyville, Illinois, United States (website)
- Audio Connection — online and in-store — Verona, New Jersey, United States (website)
- Audio Elation — in-store — Lolo, Montana, United States (website)
- Audio Excellence (CH) — Switzerland (website)
- Audio Gallery — online and in-store — Las Rozas de Madrid, Comunidad de Madrid, Spain (website)
- Audio Philosophy — in-store — Baton Rouge, Louisiana, United States (website)
- Audio Vision San Francisco — online and in-store — San Francisco, California, United States (website)
and 70 more verified dealers