Grimm Audio MU1 Music Streamer – Black Finish

Description

The Grimm Audio reputation, in a box

The Grimm Audio MU1 is what happens when one of the most respected professional-audio engineering teams in Europe (Grimm Audio’s mastering-grade DAC and clock work is used in major mastering studios) builds a domestic Roon Server. It’s a Roon Server, a Roon Ready endpoint, a UPnP renderer, a Tidal Connect endpoint and an FPGA-based digital signal-path platform — all in one Linux-based unit.

Roon Server + endpoint in one

The MU1 runs Roon Server internally — no separate NUC, no Nucleus, no headless Mac mini elsewhere in the rack. It scales to libraries of up to 100,000 tracks, supports Tidal and Qobuz at full resolution, and presents itself simultaneously as the Roon Core, a Roon Ready endpoint, and a UPnP renderer. Pair it with any third-party DAC, or feed it straight into a Grimm Audio LS1 active-speaker system for the seamless cross-product integration the company designs around.

FPGA Pure Nyquist upsampling

An in-house-designed FPGA handles all sample-rate conversion. The “Pure Nyquist” filters Grimm publishes are mathematically reference filters — minimum-phase or linear-phase derivatives that approach the theoretical ideal — and the firmware updates them as Grimm refines the implementation. The audible result is a noticeably calmer, more spacious presentation than typical off-the-shelf Roon hardware.

Ultra-low clock jitter

Grimm’s reputation in the professional mastering world is built on clock work, and the MU1 inherits that. Six channels of digital output, low-jitter clocking, and the option to feed an external word clock for studio-tier setups.

Inputs and outputs

• Digital outputs: 6-channel (supports surround playback) — typically AES/EBU + S/PDIF + optical configurations
• Digital inputs: 3 × stereo digital (AES, S/PDIF, optical) for feeding the MU1 from external sources
• Storage: External USB + NAS; optional internal SSD
• Network: Gigabit Ethernet
• Control: Web-browser interface; included infrared remote; Roon app

Where it fits

The MU1 is the Roon Server we specify on serious listening-room installs where the customer wants one server doing everything — Roon Core duties, primary endpoint duties, and the clock work that feeds the DAC. Pairs naturally with Mola Mola Tambaqui, dCS Lina, T+A SD 3100 HV, the Grimm LS1 active-speaker system, or any other reference DAC.

Specification highlights

• Integrated Roon Server (scales to 100k tracks) + Roon Ready endpoint
• Tidal Connect, Qobuz, full UPnP renderer
• In-house FPGA with Pure Nyquist upsampling filters
• Ultra-low clock jitter, 6-channel digital output
• 3 × stereo digital inputs (AES, S/PDIF, optical)
• Linux-based operating system, web-browser control
• External USB + NAS storage; optional internal SSD
• Dimensions: 355 × 85 × 295 mm (W × H × D)
• 5-year limited warranty
• Designed and built in Eindhoven, Netherlands

Order from Hidden Home Technology

Authorised Grimm Audio dealer in Bath. The MU1 is set up for demonstration in our listening room alongside reference DACs and amplification — contact us for an extended audition before commitment. Free UK delivery on every order.