GRIMM MU1 - Ultimate digital music source with integrated Roon Labs Server
Grimm wanted to develop the most accurate audio source we could imagine. In our experience, the human hearing system shows an incredible sensitivity to anomalies. Even unimaginably small aberrations appear to be audible. In principle, digital audio does offer perfect reproduction. Its sonic quality, however, is limited by the implementation accuracy of the physical and mathematical laws that affect the conversion from one format to another. Grimm Audio strives to bring you confidence that all technical details are taken care of to the greatest extent so that the reproduction system steps out of the way of the music.
| Brand: Grimm Audio |
| Product Type: Network Streamers |
Grimm Audio MU1
Ultimate digital music source with integrated Roon Labs Server
With the MU1, Grimms’ 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.
“The MU1 is the ultimate digital music source: attractive, reliable and precise”
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 Core 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 will offer a solid alternative.
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. The MU1 has 6 channel outputs and 3 stereo digital audio inputs.
From Classic to Cutting Edge: The Connections of the MU1
With a wide range of outputs, including AES/EBU, SPDIF, and optical, the MU1 adapts effortlessly to the DAC of your choice. Its dual AES output is perfect for high-resolution playback, ensuring every detail is transferred with absolute precision. And for those who prefer modern flexibility, network streaming and Roon integration provide an elegant way to bring your entire music library, local or online, to life.
The MU1 has 6 channel outputs and 3 stereo digital audio inputs.
MU1 DRIVEN TO IMPROVE
Exceptional Build Quality for Lasting Performance
- The Grimm MU1 is built with exceptional precision, using a rigid aluminum chassis that minimizes vibration and resonance for optimal audio performance. Every detail, from the machining of the enclosure to the layout of internal components, reflects a focus on durability and stability. This robust build quality not only ensures long-lasting reliability but also contributes to the refined, high-end aesthetic of the unit.
MU1 CONFIGUGRATIONS
Easy Configuration with advanced settings
The Grimm MU1 offers an advanced configuration interface that allows precise control over digital output formats, upsampling options, and clocking behavior for integration into complex audio systems. Users can tailor playback parameters, such as bit depth, sample rate conversion, and Roon-based DSP settings, to match their DAC and listening preferences. Its configuration flexibility ensures both optimized sound quality and seamless system synergy, even in high-end setups.
MU1 MULTI-COLOR DISPLAY
Grimm MU1: Intuitive Multilingual Display
The Grimm MU1 features a multilingual display, making operation intuitive and accessible for users around the world. Menu navigation and system settings can be viewed in multiple languages, ensuring clarity regardless of the user’s preference. This enhances the usability of the MU1 in diverse international audio setups.
MU1 INTUITIVE CONTROL
Precision Rotator Knob for Intuitive Control
The Grimm MU1’s rotator knob provides precise, tactile control over volume, menu navigation, and settings adjustments. Its smooth, high-quality mechanism allows for fine incremental changes, enhancing usability and user confidence. The knob’s responsive design ensures a satisfying and intuitive interaction with the MU1’s interface.
INTERNAL STORAGE
High-Speed Internal SSD Storage
The Grimm MU1 comes equipped with internal SSD storage, enabling high-speed, reliable playback of digital files directly from the unit. This internal storage reduces reliance on external devices, minimizing potential signal degradation and simplifying the system setup. With ample capacity and fast access times, it ensures seamless streaming and instant responsiveness for high-resolution audio.
Grimm MU1 SPECIFICATIONS
MU1 features
- Roon Core and Roon End Point integrated
- ultra high up- and downsampling precision
- ultra low clock jitter
- seamless integration with LS1 series
- excellent source for 3rd party DACs
- all sample rates and formats supported
- surround playback option with 6 digital output channels
- AES, spdif and optical digital stereo inputs
- web control of setup via any browser
- high performance FM receiver (soon)
- external USB and NAS storage, optional internal SSD
- Tidal and Qobuz support
- Spotify and Tidal Connect support (soon)
- 355 x 85 x 295mm (WxHxD)
- 5 year limited warranty
MU1 Technical Specifications
Processor & Memory:
- Intel i3 CPU, >2.4 GHz
- 4 cores, 4 threads with Hyper-threading
- 4GB DDR4-2133 RAM
Storage:
- Internal SSD for operating system
- Optional internal SSD for music data storage
Display:
- 3.5" full-color TFT LCD
- Resolution: 480 × 320 pixels
Digital Inputs:
- 1 × AES3 (XLR)
- 1 × S/PDIF (RCA)
- 1 × Toslink (optical)
- 1 × USB-A
- 1 × RJ45 Ethernet
Digital Outputs:
- 2 × AES3 (XLR)
- 1 × S/PDIF (RCA)
- 1 × Grimm LS1 Control Out (RJ45)
Audio Processing:
- Ultra-low jitter clock (0.6 ps RMS)
- FPGA-based upsampling and decimation
- Supports PCM up to 384 kHz / 32-bit, DSD64/128/256, DXD
- “Pure Nyquist” decimation filter
- Optional FPGA volume control (0 dB to -63 dB in 1 dB steps)
Connectivity:
- 2 × USB 3.0 ports
- 1 × 3.5mm socket for external IR remote
- FM cable input
Power Supply:
- Input: 90–240 V AC (50/60 Hz)
- Power factor: >0.98
- Normal use: 17 W
- Maximum: 50 W
Physical Dimensions:
- Width: 355 mm
- Depth: 295 mm
- Height: 100 mm
- Weight: 4.5 kg
MU1 downloads
- Download the Grimm MU1 leaflet
- Grimm MU1 Hardware manual
- Grimm MU1 Software manual
- Grimm Roon Backup Manual
- Study the Grimm MU1 “Pure Nyquist” filters blog
About Grimm Audio
Grimm Audio was founded in 2004 and is based in Veldhoven, The Netherlands. Our initial aim was to combine the mastery of the greatest minds of audio experts, and we continue to do so. All Grimm Audio products carry the joined insight of well known scientists in the fields of audio electronics, acoustics and physics, fused with an intuition built on the experience of many years of focussed listening, professional engineering and audiophile enthusiasm.
Our first product, the AD1 discrete 1 bit analog to digital converter, is still the benchmark for sound quality. A classical music label like Channel Classics has reinforced its reputation using this converter. While refining the AD1’s clock circuitry, the CC1 master clock was developed, that is measured as being the lowest jitter master clock in the professional audio industry. It serves as the digital heart beat of many studios around the world.
For the famous Wisseloord studios in the Netherlands the TPR series of studio cables was developed, offering neutral performance for an affordable price. Next came the flagship product of Grimm Audio, the LS1 playback system. Critically acclaimed as “the world’s best complete audio system” it serves as a reference in a variety of studios and as a source for musical enjoyment in many living rooms. The MU1 Music Player takes its performance yet one step further up, leading on a new road to perfection. And the MU2 Streaming DAC is the next milestone on that road.
Grimm Audio uses the highest level of technical and audiophile knowledge to build audio equipment that has no equivalent.
