Grimm Audio MU1 User manual
Please read this manual before operating the
unit.
Digital audio can oer perfect reproduction.
If... the implementation is of the highest accuracy.
MU1: Your Music Source. For life.
Please read this manual before operating the unit.
Manual MU1 © Grimm Audio
2
Table of Contents
1. Introduction 3
2. Important Safety Instructions 4
3. Installing 6
4. Signal Connections 7
5. Specications 10
6. Grimm Audio Limited Warranty 12
Table of Contents
Manual MU1 © Grimm Audio 3
1. Introduction
Thank you for purchasing the Grimm Audio MU1 media
player. It is designed to be the most sophisticated and
best sounding music player on the market and at the
same time blend seamless in your daily music playing
routine. Core of the MU1 technology is an fpga
processor board of our own design that oers the
highest quality oversampling and de-jittering possible.
The amount of work and knowledge that went into this
project can hardly be overestimated. All this eort
resulted in an elegant box of minimalistic design that
humbly steps out of the way for the music. We are
grateful that we were allowed to develop this gem and
wish you many pleasurable hours of listening.
In this manual you will nd all information related to the
hardware of your MU1. Since the software of the MU1 is
regularly updated, we decided to oer the MU1
software manual only as download. You can nd the
latest version of the MU1 software manual on the MU1
page of our web site grimmaudio.com.
The Grimm Audio Team
1. Introduction
Manual MU1 © Grimm Audio
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2. Important Safety Instructions
Grimm Audio gaat er van uit dat u deze Engelstalige tekst
volledig begrijpt. Als u hier moeite mee heeft dient u contact
op te nemen met Grimm Audio. Op verzoek sturen wij u een
vertaling toe.
Grimm Audio nimmt an, dass Sie diesen Englischen Text
völlig verstehen. Wenn notwendig, nehmen Sie bitte Kontakt
auf mit Grimm Audio. Auf Wünsch wird Ihnen eine
Übersetzung zugeschickt.
Grimm Audio suppose que le lecteur comprend
parfaitement le texte en Anglais ci-dessous. En cas de doute
s.v.p. contacter Grimm Audio. Si necessaire, on pourra vous
envoyer une traduction.
Grimm Audio da por supuesto que el texto en versión
Inglesa no ofrece ninguna duda de interpretación y se
entiende integramente. Si este no fuese su caso rogamos
contacte con Grimm Audio quien, a petición, se encargaría
de enviarle la correspondiente traducción.
Please follow these precautions when using
this product:
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Dangerous voltage is inside this apparatus. Opening
is only allowed by qualied service personnel.
6. Use the supplied power cable as intended. Do not
defeat the safety purpose of the polarized or
grounding-type plug. A polarized plug has two
blades with one wider than the other. A grounding-
type plug has two blades and a third grounding
prong. The wide blade or the third prong are
provided for your safety. When the provided plug
does not t into your outlet, consult an electrician
for replacement of the obsolete outlet.
2. Important Safety Instructions
Manual MU1 © Grimm Audio 5
7. Protect the power cord from being walked on or
pinched, particularly at plugs, convenience
receptacles, and the point where they exit from the
apparatus.
8. Unplug this apparatus during lightning storms or
when unused for long periods of time.
9. Do not use this apparatus near water.
10. Do not use this apparatus outside.
11. Do not expose the apparatus to dripping or
splashing. Do not place objects lled with liquids
(ower vases, drink cans, coee cups, etc) on the
apparatus.
12. Clean only with a dry, soft, non-uy cloth. Do not
spray any liquid cleaner onto the cabinet, as this
may lead to dangerous shocks.
13. Install in accordance with the manufacturer’s
instructions.
14. Do not install near any heat sources such as
radiators, heat registers, stoves, or other apparatus
(including ampliers) that produce heat. Avoid
exposure to direct sunlight.
15. Use only attachments or accessories specied by
the manufacturer.
16. This unit runs slightly warm when operated
normally. Operate in a normal ventilated area.
17. Refer all servicing to qualied service personnel.
Servicing is required when the apparatus has been
damaged in any way, such as when the power-
supply cord or plug is damaged, liquid has been
spilled or objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture,
does not operate normally, or has been dropped.
18. WARNING: To reduce the risk of re or electric
shock, do not expose this apparatus to rain or
moisture.
2. Important Safety Instructions
Manual MU1 © Grimm Audio
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3. Installing
Unpacking and Installation
Your MU1 was carefully packed at the factory and the
packaging it came in was designed to protect it from the
trials and tribulations of shipping. Keep the box and all
packing materials, so that in the unlikely event that you
need to return the MU1 for servicing, you can do so
safely.
Placement
The MU1 does not produce strong RF elds nor is
susceptible to them. You can position it near other
digital gear such as computers and disk recorders
without worry. In general it is a good idea to keep some
distance between monitors (LCD and CRT) and audio
cables because of risk of induced low level noise due to
stray magnetic elds.
AC Power Hookup
The MU1 has a switch mode power supply that works
with AC mains voltages from 90V to 240V +/-10%. Make
sure this complies with your local mains voltage. The
MU1 is shipped with a proper mains cable. Grimm
Audio cannot be held responsible for problems caused
by using the MU1 with improper AC wiring or voltage.
The MU1 has a small power switch on the rear panel. A
short press will initiate start-up of the system. Another
press will initiate the power-down cycle. Please wait till
the power led turns o before unplugging the AC power
cable.
The MU1 relies on safety earth in the mains cable to
guarantee your safety. It also needs this connection as
low impedance path for mains leakage current to
prevent hum or sound quality degradation in your
system. For this reason, please connect all audio
equipment in your system to a common mains outlet
with safety earth connection. If you do not have safety
earth available on the outlets in your listening room,
please consult an electrician to have him add it.
3. Installing
Manual MU1 © Grimm Audio 7
4. Signal Connections
Front:
On the front you nd the MU1 activity LED in the ‘i’ of the Grimm logo. The display shows all user information.
4. Signal Connections
Manual MU1 © Grimm Audio
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Rear:
On the back of the MU1 you nd, from left to right: three digital audio outputs (two generic AES3 and one Grimm LS1),
three digital audio inputs, an FM cable input , an ethernet network input, 2 USB connections for external storage, a
3.5mm socket for an external IR remote sensor, a small mains power switch and the mains power connector.
4. Signal Connections
Manual MU1 © Grimm Audio 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.
For more information about the control of your MU1, please refer to the MU1 software manual pdf from our web site.
4. Signal Connections
Manual MU1 © Grimm Audio
10
5. Specications
General:
• Max. ambient temperature for operation: 50 °C.
• Fuse (worldwide): 200 mA fast blow.
• Weight: 4.5 kg.
• Dimensions: width x depth x height: 355 x 295 x 100
mm or 14” x 11.6” x 3.9”.
• Package dimensions: 536 x 392 x 219 mm.
Clock specications:
• Internal intrinsic clock jitter <0.6 ps RMS (> 10 Hz).
• Can slave to 44.1 kHz and 48 kHz based digital
sources at 1FS, 2FS and 4FS +/- 50 ppm.
• The output will mute for 80 ms when changing clock
base rates.
Sample rate conversion with fpga processor:
• Upsampling of 1FS and 2FS les, streams and digital
sources to 4FS or 2FS with “Pure Nyquist”
decimation lter.
• Downsampling of DSD64, DSD128, DSD256 and
DXD les and streams to 4FS or 2FS with “Pure
Nyquist” decimation lter.
• Optional FPGA volume control on Digital 1 and 2
outputs: from 0 dB to -63 dB in 1 dB steps.
• Latency from digital in to digital out: 11 ms at 48
kHz.
Power supply:
• Mains voltage range: 90 – 240 V AC +/- 10% (50 and
60 Hz).
• Power factor: > 0.98.
• Power consumption: Normal use 17 W, maximum
50 W.
5. Specifications
Manual MU1 © Grimm Audio 11
Internal computer properties:
• Intel i3 CPU, > 2.4 GHz.
• 2 cores, 4 threads, with Hyper-threading.
• 4GB DDR4-2133 RAM 2400 MHz.
• 1000 Mb/s Ethernet.
• 2x USB 3.0 port.
• Internal SSD for OS.
• Optional internal SSD for music data storage.
Display specications:
• Full colour TFT LCD.
• 3.5 inch diagonal.
• 480 x 320 pixels
5. Specifications
Manual MU1 © Grimm Audio
12
6. Grimm Audio Limited Warranty
Grimm Audio BV (“Grimm Audio”) warrants this product
to be free of defects in material and workmanship for a
period of two (2) years for parts and for a period of two
(2) years for labor from the date of original purchase.
This warranty is linked to the serial number of the
device and can be transferred to second hand owners if
they can show their purchase bill. The original owner
can extend his limited warranty to a period of ve (5)
years for labor and parts if he sends the original
warranty card that came with the unit to the Grimm
Audio factory. The extended warranty is enforceable
only by the original retail purchaser and cannot be
transferred or assigned. The extended warranty does
not apply to the built in computer and SSD drive parts of
the MU1.
During the warranty period Grimm Audio shall, at its
sole and absolute option, either repair or replace free of
charge any product that proves to be defective on
inspection by Grimm Audio or its authorized service
representative. In all cases disputes concerning this
warranty shall be resolved as prescribed by law. To
obtain warranty service, the purchaser must rst call or
write Grimm Audio at the address and telephone
number printed below to obtain instructions where to
send the unit for service. All enquiries must be
accompanied by a description of the problem. All
authorized returns must be sent to Grimm Audio or an
authorized Grimm Audio repair facility postage prepaid,
insured and properly packaged. Proof of purchase must
be presented in the form of a bill of sale or some other
positive proof that the product is within the warranty
period. Grimm Audio reserves the right to update any
unit returned for repair. Grimm Audio reserves the right
to change or improve design of the product at any time
without prior notice.
This warranty does not cover claims for damage due to
abuse, neglect, alteration or attempted repair by
unauthorized personnel, and is limited to failures
arising during normal use that are due to defects in
material or workmanship in the product.
6. Grimm Audio Limited Warranty
Manual MU1 © Grimm Audio 13
In no event will Grimm Audio be liable for incidental,
consequential, indirect or other damages resulting from
the breach of any express or implied warranty,
including, among other things, damage to property,
damage based on inconvenience or on loss of use of the
product, and, to the extent permitted by law, damages
for personal injury.
© 2020, Grimm Audio BV. All rights reserved
Grimm Audio MU1 hardware manual v1.0, 28/10/20
Reproduction in whole or in part is prohibited.
Specications subject to change without notice.
Grimm Audio, Eindhoven, The Netherlands
Tel. +31 40 213 1562
6. Grimm Audio Limited Warranty
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Table of contents
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