Grimm Audio / MU1 with KS Internal LAN

Here is a Grimm Audio MU1 digital music source / music player with 2TB internal storage. This one also has the $1,800 Kubala Sosna internal LAN upgrade. The MU1 has earned its reputation as one of the truly serious digital front ends in high-end audio: a beautifully engineered Roon Core / Roon endpoint, streamer, reclocker, FPGA-based upsampler, and digital hub in one elegant chassis. Grimm’s design is not just another computer-in-a-box streamer; the MU1’s ultra-low-jitter clocking, proprietary FPGA processing, and superb AES/EBU implementation are the heart of why this unit has become such a respected reference-level digital source.

Reviewers have been unusually strong in their praise. John Atkinson of Stereophile wrote, “And, especially via its upsampled AES/EBU outputs, it sounds superb. For those who can afford it, the Grimm MU1 is a highly recommended digital audio solution.” Michael Lavorgna of Twittering Machines called it his “first recommendation” for listeners looking to bring “more refined beauty” to their music while simplifying streaming and serving in a single component. Joël Chevassus of Audiophile Magazine went even further, writing that, operated as a server, “the MU1 is the best player I have heard to date.”

Sonically, the MU1 is prized for exactly what the best digital sources should do: lower noise and timing artifacts, improve dimensionality and separation, preserve tonal density, and let music flow with greater ease and coherence. Used through AES/EBU into a high-quality DAC, the MU1 can be a major step forward for systems that already have excellent amplification, loudspeakers, and cabling, but still have room to improve the digital front end.

With its integrated Roon Core capability, elegant industrial design, 2TB internal storage, and Grimm’s exceptional digital engineering, this is a very desirable preowned opportunity on a product with current retail pricing now substantially higher than earlier review-era pricing. It is an ideal choice for the serious Roon-based listener who wants a clean, elegant, extremely high-performance digital source from one of the most respected engineering-driven companies in high-end audio.