Grimm Audio
MU1
Introduced 2020$14,400 MSRP
The MU1 is a Dutch-designed, hand-assembled music server/streamer from Grimm Audio, the same small pro-audio-derived engineering team behind the LS1 active monitor line, built around a Grimm-designed FPGA for resampling and a factory-installed Roon Core/Endpoint on a custom Linux platform. It has drawn acclaim from Stereophile, 6moons, and HIFICRITIC (which gave it an Audio Excellence Award), and is a recurring favorite in high-end streamer shootout threads on What's Best Forum and Audiogon.
MSRP
$14,400
Used market · Excellent
$8,100
-44% vs MSRP
as of Sep 1, 2026MSRP to used market
From $9,800 at launch to $8,100 today.
Specifications
- Price
- $10,500 without internal storage
- Control
- Browser-based web control interface (GRUI) plus included infrared remote; no dedicated proprietary app required for Roon operation
- Outputs
- 2x AES/EBU (XLR), S/PDIF
- Storage
- Optional internal SSD (2-8 TB)
- Clocking
- Discrete, ultra-low-jitter crystal oscillator ("Grimm stable clock")
- Warranty
- 5-year limited warranty
- Dimensions
- 355 × 85 × 295 mm
- Core function
- Integrated Roon Core (up to 100,000 tracks) plus Roon Ready Endpoint with Tidal Connect and Qobuz
- Digital inputs
- AES/EBU, S/PDIF, and TosLink optical stereo digital inputs
- Digital outputs
- AES/EBU and USB outputs; supports 4× upsampling with high-precision digital volume control on the AES/EBU path
- Formats supported
- PCM up to 24-bit/192kHz and DSD128 confirmed in review testing; official page states all standard sample rates/formats supported
- Streaming support
- Roon (built-in Core/endpoint), Tidal and Qobuz via Roon
- Storage connectivity
- External USB and NAS storage supported; optional internal SSD; Ethernet network bridge mode for legacy DACs
- Digital signal processing
- Grimm-designed, custom-programmed FPGA for ultra-high-precision up/downsampling
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