Grimm Audio is a Dutch company based in Veldhoven, specializing in the design and manufacture of the finest high‑end audio equipment.
Founded in 2004, Grimm Audio quickly established a strong reputation within the audio industry — both in the world of high‑end hi‑fi and in professional audio. The company’s products are created to meet the highest demands of recording and mastering engineers while also delivering uncompromising sound quality for discerning home listeners.
Grimm Audio was founded by a passionate team of designers and engineers who share a deep commitment to exceptional audio performance and technological innovation. From the very beginning, the goal was to unite the best minds in the field to create truly outstanding and original products.
With the MU2, Grimm Audio presents one of the most advanced music streamers, servers, preamplifiers, and DACs in the world of high‑end hi‑fi — a true masterpiece that demonstrates just how refined and sophisticated modern music streaming can be.
- the Essentials at Glance
The MU2 represents the next evolution of the already acclaimed and refined MU1 music streamer.
The MU1 was designed as a pure high‑end music streamer and server, capable of managing and consolidating music from local drives, network servers, and online streaming services. Its output, however, is exclusively digital, making it the perfect partner for an external DAC.
The Grimm Audio MU2 builds on this foundation by incorporating a purpose‑built in‑house DAC. This enables it to deliver analog output directly to power amplifiers, integrated amplifiers, or active loudspeakers — turning it into a complete playback solution.
Both balanced XLR and unbalanced RCA connectors are available on the rear panel for maximum system compatibility. For those who prefer the intimacy of headphone listening, the MU2 also includes a 6.3 mm stereo headphone output — a welcome touch for any serious music enthusiast.
Comprehensive connectivity options for versatile use at the rear — the MU2 serves as Roon music server and player, analog preamplifier, and DAC all in one.
With such a visually reduced and minimalist design, one might quickly wonder about the MU2's ease of use.
The elegantly recessed jog dial on top allows intuitive navigation through menus — simply rotate to scroll, press to select.
Volume control is handled by the MU2's sophisticated relay-based attenuator circuit, producing a refined, tactile click with each precise step.
Ultra-low Jitter-Precision ensures a musical experience hardly to find anywhere else
The MU2 delivers a level of musicality that stands apart from anything previously experienced in digital playback. Its unique combination of technical precision and sonic naturalness creates an intensely emotional listening experience that draws the listener deep into the music.
At its core is a specially selected, ultra–low-jitter clock oscillator. Each unit is individually measured and verified with our proprietary jitter analyzer before leaving the factory — ensuring absolute accuracy.
The discrete DAC is plays a crucial role in accurate and natural music reproduction
of transparency and realism that redefines digital playback.
Sleek, simple and elegant looking: The Grimm Audio MU2 remote
MU2 – DRIVEN TO IMPROVE
Exceptional Craftsmanship, Enduring Performance
Every element of the Grimm MU2 is crafted with absolute precision and purpose. Its rigid aluminum chassis forms a foundation of mechanical stability, eliminating unwanted vibration and resonance to preserve the purest possible signal integrity.
From the meticulously machined enclosure to the harmonious internal layout, every design choice reflects the pursuit of uncompromising quality.
The result is a component built not only to deliver reference-level performance, but to embody refinement and longevity in equal measure — an expression of engineering artistry that endures.
MU2 GRUI Web Interface
Easy Configuration with Advanced Settings
The Grimm MU2 offers an advanced configuration interface that provides precise control over digital output formats, upsampling options, and clock behavior — perfect for seamless integration into complex audio systems.
Users can fine-tune playback parameters such as bit depth, sample rate conversion, and Roon-based DSP settings to perfectly match their DAC and listening preferences. This level of configurability ensures optimized sound quality and effortless system synergy, even in the most demanding high-end setups.
Complex technology in an elegant housing - yet user friendly and simple to use
MU2 In Use
Grimm MU2: Intuitive & User Friendly
The MU2 is designed for the entire family. Its elegant "One-Box" form factor fits effortlessly into any environment. Control is available via Roon, the web interface, or any standard IR remote.
The MU2 features a multilingual display that makes operation intuitive and accessible worldwide. Menu navigation and system settings can be shown in multiple languages, ensuring clarity regardless of user preference. This enhances the MU2's user-friendliness across diverse international audio setups.
MU2 DESIGN
Industrial Design with Timeless Elegance
The MU2 is more than an audio component — it’s a piece of contemporary design. Its timeless aesthetic is both striking and understated, blending seamlessly into any living space while radiating quiet confidence.
The visual design language extends throughout the entire experience: from the front‑panel display to the intuitive web interface, every graphic element follows the same philosophy of clarity and refinement. We believe that a component capable of such extraordinary sonic performance should also embody the same level of visual excellence — a piece that enhances its surroundings with lasting beauty.
IINTERNAL STORAGE
High-Speed Internal SSD for Pure Performance
The Grimm MU2 features high-speed internal SSD storage, enabling direct, ultra‑reliable playback of digital music files from within the unit itself. By reducing dependence on external devices, the internal drive minimizes potential signal degradation and simplifies system setup.
With generous capacity and lightning‑fast access times, it ensures seamless streaming and instantaneous response, even with the most demanding high‑resolution audio content — preserving purity, speed, and effortless performance in perfect harmony.
GRIMM MU2 SPECIFICATIONS
MU2 Features
Integrated Roon Core and Roon End Point
Ultra‑low clock jitter
FPGA‑based discrete Major DAC
Supports all sample rates and audio formats
Relay‑based precision analog volume control
Digital inputs: AES, S/PDIF, and Optical
Analog inputs: XLR and RCA
Analog outputs: XLR and RCA
Dedicated headphone output
Web‑based setup and control via any browser
Infrared remote control
External USB and NAS storage, optional internal SSD
Native Tidal and Qobuz integration
Dimensions: 355 × 85 × 295 mm (W × H × D)
5‑year limited warranty
MU2 DAC Features
11th‑order flawless noise‑shaping architecture
1.5‑bit design (1‑bit cell) operating at a 512 fs rate
Pure Nyquist oversampling principles at 128 fs throughout
Smart, extended settling technology
Intersample overs supported without clipping
16‑tap FIR‑DAC topology
Fully symmetrical analog signal path
Ultra‑stable local power supply design
Technical Specifications
Processor & Memory
Intel i3 CPU
8 GB RAM
Tiny Core Linux OS
Integrated Roon Core and Roon Endpoint
Storage
Optional internal SSD: 2 TB or 8 TB
Supports external USB and NAS storage
Display
3.5″ TFT LCD (480 × 320 resolution)
Analog Inputs
1 × Stereo RCA
1 × Stereo XLR
2 × Stereo analog inputs total
Digital Inputs
1 × AES3 (XLR)
1 × S/PDIF (RCA)
1 × Toslink (optical)
1 × USB‑A
1 × RJ45 Ethernet
Analog Outputs
1 × Stereo RCA
1 × Stereo XLR
1 × 6.3 mm headphone jack
Digital Outputs
1 × AES3 (XLR)
1 × S/PDIF (RCA)
1 × Toslink (optical)
Audio Processing
FPGA‑based discrete Major DAC
11th‑order 1.5‑bit noise shaper
Pure Nyquist oversampling filters
Ultra‑low‑jitter clock
Relay‑based analog volume control (+8 dB to −79 dB in 1 dB steps)
Connectivity
USB 3.0 ports
1 × 3.5 mm socket for external IR remote
FM antenna input
Power Supply
Input: 90–240 V AC (50/60 Hz)
Power factor: > 0.98
Typical consumption: 17 W
Maximum: 50 W
Physical Dimensions
Width: 355 mm
Depth: 295 mm
Height: 100 mm
Weight: 4.5 kg
Grimm MU2 leaflet
Grimm MU2 leaflet
Grimm MU2 hardware manual
Grimm MU2 software manual