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Grimm Audio MU1 Manual

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Please read this manual before operating the
Please read this manual before operating the unit.
unit.
Digital audio can offer perfect reproduction.
If... the implementation is of the highest accuracy.
MU1: Your Music Source. For life.

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Summary of Contents for Grimm Audio MU1

  • Page 1 Digital audio can offer perfect reproduction. If... the implementation is of the highest accuracy. MU1: Your Music Source. For life. Please read this manual before operating the Please read this manual before operating the unit. unit.

  • Page 2: Table Of Contents

    Table of Contents 1. Introduction 2. Important Safety Instructions 3. Block Diagram 4. Installing 5. Operation and System Setup 6. Specifications 7. Grimm Audio Limited Warranty Manual MU1 © Grimm Audio...

  • Page 3: Introduction

    In this manual you will find all information related to the hardware of your MU1. Since the software of the MU1 is regularly updated, we decided to offer the MU1 software manual only as download. You can find the latest version of the MU1 software manual on the MU1 page of our web site grimmaudio.com.

  • Page 4: Important Safety Instructions

    Grimm Audio gaat er van uit dat u deze Engelstalige tekst Read these instructions. volledig begrijpt. Als u hier moeite mee heeft dient u contact op te nemen met Grimm Audio. Op verzoek sturen wij u een Keep these instructions. vertaling toe.
  • Page 5 18. WARNING: To reduce the risk of fire or electric shock, do not expose this apparatus to rain or 13. Install in accordance with the manufacturer’s moisture. instructions. Manual MU1 © Grimm Audio...

  • Page 6: Block Diagram

    S/PDIF out Network storage USB storage In this block diagram the signal flow inside a MU1 is are offered by Roon Labs software. The computer shown. The MU1 combines a streamer, audio file server, operating system is Tiny Core Linux. Most other audio file player, reclocker, upsampler and digital software is developed by Grimm Audio.

  • Page 7: Installing

    MU1 with improper AC wiring or voltage. The need to return the MU1 for servicing, you can do so MU1 has a small power switch on the rear panel. A safely.

  • Page 8: Operation And System Setup

    5. Operation and System Setup Front: On the front you find the MU1 activity LED in the ‘i’ of the Grimm logo. The display shows all user information. It is a TFT screen that does not suffer from burn-in. Manual MU1 © Grimm Audio...
  • Page 9 Top: The top of the MU1 carries the main control knob. It is used for all user input of the MU1 via turning and pressing. Depending on the state of the system and the menu selection this knob changes functionality.
  • Page 10 Press and turn selects the audio source. A short press is shorter than 2 seconds, a long press is longer than 2 seconds. For more information about the control of your MU1, please consult the MU1 software manual that can be downloaded from our web site.
  • Page 11 Rear: On the back of the MU1 you find, from left to right: four Note that models with serial number 13-0.001.xxx and digital audio outputs (one generic S/PDIF, two generic 13-0.002.xxx do not have the S/PDIF output, and some AES3 and one Grimm LS1), three digital audio inputs, an...
  • Page 12 Mains power socket In general the MU1 is put in ‘stand-by’ when not in use. For more info, please consult the MU1 software manual. The mains power socket is a standard IEC C13 model. In case your country has an EU, US or UK type wall outlet,...
  • Page 13 The MU1 makes use of DHCP. for oversampling and de-jittering and benefits from To use a static IP address in the MU1 please consult the MU1’s high performance rendering. manual of the network device that acts as DHCP server within your network (usually the main router).
  • Page 14 DAC or use in a surround LS1 system. Please use 110 Ohm balanced cable with this Stereo LS1 wiring output. In case you use the MU1 with a Grimm Audio LS1 • AES out 2: ‘Digital output 2’, transformer coupled system, the connections are elegantly minimalistic too, balanced XLR3 digital output for connection to a as shown on the next page.
  • Page 15 LS1 Stereo wiring Blue & Black = Audio & Control Manual MU1 © Grimm Audio Manual MU1 © Grimm Audio...
  • Page 16 Like AES3, this connection supports two channels of audio. In a MU1 surround system with LS1s, For instance if your MU1 is close to your right front LS1, the main Left and Right channels are provided by the you can connect the wires as on the next page.
  • Page 17 5 LS1 Surround wiring, right front and right rear first Blue = Audio Black = Control Blue & Black = Audio & Control Manual MU1 © Grimm Audio...
  • Page 18 For example, if you made the following chain: LS1 Center → LS1 Rear Left → LS1 Rear Right. MU1 → LS1 Right → LS1 Left → LS1 Center → LS1 Rear You may arbitrarily swap left and right of the front and Right →...
  • Page 19 5 LS1 Surround wiring, left front and left rear first Blue = Audio Black = Control Blue & Black = Audio & Control Manual MU1 © Grimm Audio...
  • Page 20 So for example if you made the following chain: LS1s and just skip the center speaker. MU1 → LS1 Right → LS1 Left → LS1 Rear Right → LS1 This means that the Cat5 wiring can be made in one of...
  • Page 21 4 LS1 Surround wiring, right front and right rear first Blue = Audio Black = Control Blue & Black = Audio & Control Manual MU1 © Grimm Audio...
  • Page 22 In such cases, connect the LS1s party speaker as center channel, replace the center LS1 to the MU1 using the Cat connection as if it were a with the center DAC. stereo setup. Connect the other channels via the MU1 XLR AES3 outputs.
  • Page 23 3 LS1 Surround wiring, with stereo DAC for rear speakers Blue = Audio Black = Control Blue & Black = Audio & Control Manual MU1 © Grimm Audio...
  • Page 24 MU1 FPGA. The picture on the next page illustrates the wiring of such a system. Please read the MU1 software manual for information about how to setup the MU1 for this topology, like how to enable or disable the FPGA volume control on all channels.
  • Page 25 5 DAC channels Surround wiring Blue = Audio Manual MU1 © Grimm Audio...

  • Page 26: Specifications

    The output will mute for 80 ms when changing clock • Mains voltage range: 90 – 240 V AC (50 and 60 Hz). base rates. • Power factor: > 0.98. • Power consumption: Normal use 17 W, maximum 50 W. Manual MU1 © Grimm Audio...
  • Page 27 • 1 x USB 2.0 port. • Internal SSD for OS. • Optional internal SSD for music data storage. Display specifications: • Full color TFT LCD. • 3.5 inch diagonal. • 480 x 320 pixels Manual MU1 © Grimm Audio...

  • Page 28: Grimm Audio Limited Warranty

    All This warranty is linked to the serial number of the authorized returns must be sent to Grimm Audio or an device and can be transferred to second hand owners if authorized Grimm Audio repair facility postage prepaid, they can show their purchase bill.
  • Page 29 In no event will Grimm Audio be liable for incidental, © 2023, Grimm Audio BV. All rights reserved consequential, indirect or other damages resulting from the breach of any express or implied warranty, Grimm Audio MU1 hardware manual v1.4, 10/4/23...
  • Page 30 Grimm Audio BV The Netherlands +31 40 213 1562 info@grimmaudio.com www.grimmaudio.com...

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