KEF Mu3 User manual

Design by Ross Lovegrove. Sound by KEF.
Renowned for his innovative approach and flowing,
sculptural forms, Ross Lovegrove brings a new
dimension to sound. Through design that embraces both
beauty and technological ingenuity, Lovegrove's ongoing
collaboration with KEF is an exercise in aesthetic and
engineering excellence.

Quick Start Guide
Mu3
Noise CancellingTrue Wireless Earphones
Design by Ross Lovegrove
CD
KEF

In the Box
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Earphones Overview
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Charging case USB-C LEFT LED
.,
multi function key
EN Charging case / multi-function key
DE Ladekoffer I Multifunktionstaste
FR Etui de chargement / Touche multifonction
ES Estuche de carga / Tecla multifunci6n
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RIGHT
multi function key

Get Started
DE Erste Schritte FR Pourcommencer ES lnicio
JA c.::-~J:§1.f)t CHI-S Jf~ CHI-T lffl~ KR ,.q~"6"~71
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Music / Call / Voice control
DE Musik-Steuerung / Anruf-Steuerung / Sprach-Steuerung
FR Musique / Appel / Controlevocal ES Musica / Llamadas / Control por voz
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LED
LEFT RIGHT
► II
SP x 1
LP
LP
►► I
SPx 2
SPX i'
ANC on ➔ Ambient
t. ANC off .,
IIIIWl.__ __ ®_f _ ___.__ ___ sP_x_2_ ______ ____.
Jj ,,..
EN Short press (SP) / Lon g press (LP) / Ambient
DE Kurz drucken (SP) / Lang drUcken (L P)/ Umgebuangs
FR Pression courte (SP) / Pre ss ion longue ( LP )/ Ambiant
ES Pulsaci6n breve (SP) / Pulsaci6n la rga ( LP) / Ambiete
SPx 1
LP
LP
SP x 2
SPx 2
JA 7 • ~7 (SP)/ ~tfJJG(LP) / 7/~I/1--
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Specifications
DE Spezifikationen FR Caracteristiques ES Especificaciones
JA {±~ CHI-S u~m~~ CHI-T mffl- KR A~~
Model
Product
Speaker drivers
Frequency range
Sensitivity
Impedance
Max power output
Bluetooth
Codec
Bluetooth power
Bluetooth range
Bluetooth frequency
Li-ion rechargeable battery
Batteryplay time (Earbud)
Batteryplay time (charging case)
Fast charging for 5 mins
Dimension (H xW x D)
Weight
Operatingtemperature
Powerinput
Mu3
Bluetooth earphones
8.2mm
20 -20000Hz
104dB/1mW at 1KHz(1KHz 1mW)
160
5mW(MAX)
5.0
SBC,AAC
~13d8m
10m
2.402GHz -2.48GHz
50mAh (earbud), 350mAh (charging case)
9 hrs (BT + ANC on)
15hrs
1 hr battery play time
24.5 x 17.5 x 26.3mm (earbud)
33.5 x 62 x 52mm (charging case)
5.8g (earbud)
46.Bg (charging case)
-10°C to 45°C
DC SV600mA

FCCCompliance Information
This devicecomplies with Part 15 of the FCC Rules. Operationis subject to the following two conditions: (1) this devicemay not cause
harmful interference, and(2) this device must accept any interferencereceived, including interference that maycause
undesired operation.
Changes or modifications not expresslyapproved by the party responsible for compliancecould void the user's authority to operate
the equipment.
This equipmenthas been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.These
limitsare designed to provide reasonable protectionagainst harmful interference in a residential installation.This equipment generates, uses
and can radiate radio frequencyenergy and, if not installed and used in accordance with theinstructions, maycause harmful interference to
radio communications. However, there is no guarantee that interference will not occur in a particularinstallation.
If this equipmentdoescause harmful interference to radio or television reception, which can be determined by turning the equipment off and
on, the useris encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receivingantenna.
• Increase the separation between the equipment and receiver.
-Connect the equipment into an outlet on a circuit different from that to which the receiverisconnected.
-Consult the dealer or an experienced radio/TV technician for help.
FCC SAR Statement
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. End user must follow the specific
operating instructions for satisfying RF exposure compliance.This transmitter must not be co-located or operating in conju nction with any
other antenna or transmitter.
The portable device is designed to meet the requirements for exposure to radio waves established by the Federal Communications
Commission (USA).These requirements set a SAR limit of 1.6 W/kg averagedover one gram of tissue. The highest SAR value reported under
this standard duringproduct certification.
Industry Canada (IC) ComplianceStatement
This device contains licence-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic DevelopmentCanada's
licence-exempt RSS(s). Operation is subject to the following two conditions:
1.This device may not cause interference.
2. This device must accept any interference, includinginterference that maycause undesired operation of the device.
This equipmentcomplies with ISED radiation exposure limitsset forth for an uncontrolled environment. End user must follow the specific
operating instructions for satisfying RF exposure compliance.This transmitter must not be co·located or operating in conjunction with any
other antenna or transmitter. The portable device is designed to meet the requirements for exposure to radiowaves established by the ISED.
These requirements set a SAR limit of 1.6W/kg averaged over one gram of tissue. The highest SARvaluereported under this standard during
product certification.
Avis de conformite aux normes d'lndustrie Canada
L'emetteur/recepteurexempt de licence contenu dans le presentappareil est conforme auxCNR d'lnnovation, Sciences et Developpement
economiqueCanadaapplicablesaux appareils radioexempts de licence. L'exploitation est autorisee aux deux conditions suivantes :
1. L'appareil ne doit pas produire de brouillage;
2. L'appareil doit accepter tout brouillage radioelectrique subi, meme si le brouillage est susceptibled'en compromettre le fonctionnement.
Cet equipement est conforme aux limites d'exposition aux rayonnements d'ISDEetablies pour un environnementnoncontr0le. L'utilisateur
final doit suivreles instructions d'utilisation specifiques pour se conformer a!'exposition RF. Cet emetteur ne doit pas etre colocalise ou
fonctionner en conjonction avec une autreantenne ou un autreemetteur. L'appareil portable est coni;u pour repondre aux exigences
d'expositionaux ondes radio etablies par ISDE. Ces exigences fixent une limite DAS de 1,6W / kg en moyenne sur un gramme de tissu.Valeur
DAS la plus elevee rapportee selon cette normelors de la certification du produit.
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CEConfor mity
Hereby:GP
Product name : Bluetooth earphones
Brand Name : KEF
Model: Mu3
Frequency band : 2.402GHz -2.48GHz
Max power value : SmW
Applicable Standards:
Safety: EN 62368
Health:
EMC: EN 62479 ETSI EN 301489-1
ETSI EN 301489-17
EN 55032
EN 55020
Radio: EN 300328
The CE Declaration of Conformityis available on our website at www.kef.com
Complies with
IMDA Standards
DA101682
F CC ID : UXD201125
IC ID : 21561-201125
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Forproductregistration, please visit
https://kef.world/Mu3reg
GPAcoustics (UK) Limited
Eccleston Road
Tovil, Maidstone
Kent, ME15 6QP
UK
CE )r
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KEF.com

Sound by KEF. Design by Ross Lovegrove.
With KEF’s Mu3 Noise Cancelling True Wireless Earphones you are free to enjoy pristine sound
everywhere. KEF has once again collaborated with visionary designer Ross Lovegrove, the latest step in
a relationship that started with the incredible Muon loudspeakers, through Muo Bluetooth speakers and
now the Mu3 earphones. Designed to be both comfortable and elegant, Mu3’s flowing, sculptural lines
and smart engineering ensure a perfect fit while also delivering exceptional sound on the move.
KEF’s signature pure and accurate sound
Each of the Mu3 earphones’ sculptural enclosures contains an 8.2mm full-range dynamic driver. These
are expertly tuned by the same KEF engineering team responsible for our loudspeakers, ensuring
consistently pure and accurate sound on the move, with rich midrange, detailed bass and crisp high
tones, capable of revealing even the most subtle nuances of music.
All day, any way
Active Noise Cancellation
The audio performance of the Mu3 earphones benefits from KEF's specially tuned Active Noise
Cancellation, which eliminates external noise without affecting the details that bring music to life.
The earphones also boast Ambient Mode, where at the touch of a button Active Noise Cancellation
is disengaged and instead the audio picked up on the microphones is played through the earphones,
bypassing passive noise reduction and providing you with instant clarity on what is going on around you.
Hassle-free with Bluetooth 5.0
Mu3’s audio performance is further enhanced by the introduction of simultaneous transmission, where
both earphones receive a signal at the same time, rather than the more usual approach where audio is
sent to one earpiece and relayed to the other, therefore running the risk of introducing latency. Coupled
with Bluetooth 5.0 connectivity, simultaneous transmission means the Mu3 earphones deliver a seamless
performance, are simple to connect and exceptionally stable on both iOS and Android devices.
All-day listening and fast charging
A high-capacity battery combines with smart power management and fast-charge technology to ensure
the Mu3 earphones keep going as long as you do. Mu3 can keep you entertained for up to 24 hours, with
9 hours on-board battery life, plus up to 15 hours with the charging case, and if you are desperate to use
them quickly, fast charging delivers a full hour of use from only 5 minutes charging. And don’t worry if
you get caught out in a shower, because with their IPX5 splash-proof design, these headphones are good
for a little dancing in the rain.
Comfort and ease
Compact, ergonomic design
The Mu3 earphones are perfectly balanced in the ear thanks to the smart way they are weighted, which
stops them wanting to fall out. A comprehensive analysis of different ear shapes and sizes has led to the
development of four subtly different sized ear tips that are designed to rest on the ear concha to ensure
you get the most comfortable fit for your ears, while also providing the perfect seal for noise isolation
and to keep them securely in place.
Mu3
Noise Cancelling True Wireless Earphones
Summary of features
• Active Noise Cancellation tuned to eliminate
external sound while preserving nuance and detail
• 8.2mm full-range dynamic driver engineered to
reveal the smallest details of your favourite music
• Bluetooth 5.0 for exceptionally stable connections
with both iOS and Android devices
• Ergonomic design for comfort and fit
• IPX5 splash-proof design for all weather conditions
• Up to 24-hours use (9 hours at full charge; plus 15
hours with charging case)
• Fast charging of 5 mins for 1-hour use
• 4 sets of ultra-soft silicone ear tips for optimal
comfort and fit (large, medium, small, short)

Intuitive control
KEF’s engineers understand that control is vital when using earphones, which is why the Mu3
earphones feature a highly intuitive, incredible responsive user interface. And because we know you
may be doing other things while you listen to music, each of the earbuds includes a multi-function
button for full control of music playback, volume and calls for instant control when only one hand is
free.
Design by Ross Lovegrove
Renowned for his innovative approach and flowing, sculptural forms, Ross Lovegrove brings a new
dimension to sound. Through design that embraces both beauty and technological ingenuity, Lovegrove’s
ongoing collaboration with KEF is an exercise in aesthetic and engineering excellence.
The Mu3 earphones may be small, but they radiate a sculptural look and feel that belies their compact
dimensions. The collaboration with Ross Lovegrove has once again resulted in a product that is the very
definition of technology as art, and a design that smartly complements the KEF philosophy.
Specifications
Model Mu3
Speaker drivers 8.2mm
Frequency range 20-20000Hz
Sensitivity 104dB/1mW at 1KHz (1KHz 1mW)
Impedance 16Ω
Max power output 5mW
Bluetooth 5.0
Codec SBC, AAC
Bluetooth Power ≤13 dBm
Bluetooth range 10m
Bluetooth frequency 2.402GHz-2.48GHz
Li-ion rechargeable battery 50mAh (earbud)/ 350mAh (charging case)
Battery play time (earbud) 9 hrs (BT + ANC on)
Battery play time (charging case) 15 hrs
Fast charging for 5 mins 1 hr battery play time
Dimension (H x W x D) 24.5 x 17.5 x 26.3 mm (earbud)
33.5 x 62 x 52 mm (charging case)
Weight 5.8 g (earbud)
46.8 g (charging case)
Operating temperature -10°C to 45°C
Power Input DC 5V 600mA
02.2021 | Mu3
Visit: KEF.com for more about KEF and its products.
KEF reserves the right, in line with continuing research and development, to amend or change specifications. E&OE.
In the box
• Mu3 Noise Cancelling True Wireless Earphones
• Charging case with built-in wireless charging
• USB-C charging cable
• 4 sets of silicone ear tips
• Quick start guide, warranty

ImportantSafety Information
114KEF
English
Thank you for choosing KEF headphones/earphones. KEF is dedicated to producing premium audio
products with best-in-class sound quality to give you an engrossing and pleasurable listening experience
that is true to the original performance.
Plea se read the important safety information below. For any other services, please contact your local
authorised KEF distributor,whose details can be found at www.kef.com
IMPORTANT SAFETY INFORMATION
• Followthis manual carefully for the best
results from yourspeakers • Avoid damp • Avoid temperature extremes
• Clean with a drylint free cloth • Avoid direct sunlight
• Do not use spi rit based cleaners
CAUTION
RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE.
DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS .
Warning !Listening to soundatexcessivevolumes (120d8 or more) or suddenexposure to loud noisescan cause permanent hearing damage.
Set the volume of your device to minimum before llstenlns and adjust to an appropriate volume gradually.
~
A
Warning! Prolonged listening at high volume can cause hearing loss
Always maintain a distance ofat least 3.94• (10 cm) between theear cups and a cardiac pacemaker orlmplanteddefibrillator
since the product generates permanent magnetic fields.
PAY ATTENTION TO YOUR SURROUNDINGS: Please remember thatin some circumstances, such as whiledriving, cycling,walking or jogging,
being unable to hear your surroundings can be dangerous.
KEEP AWAYFROM CHILDREN: This product should always be keptout of reach of children because it containssharp edges, small parts and
cords that may cause cuts, choking or strangulation with potentially serious oreven fatal consequences.
NOT FOR MODIFICATION: Do not attempt to modifythis product, as this mayresult in personal injuryand/or product failure.Modified
productwill not be covered by warranty.
CAUTION: Do not drop, sit on, or allow the product to be immersed in water, otherwise sound deterioration or failures may result.
:a
-
Correct Disposal of This Product This maric.ing indtcates that this product should not be disposed with other household wastes
throughout the EU. To prevent possible harm to the environment or human health from uncontrolled waste disposal, recycle it
responsibly to promote the sustainable reuse of material resources.
To return your used device, please use the return and collection systems or contact the retailer where the product was purchased. They can
take this product for environmentally safe recycling.

WarrantyInformation
KEF

Limited Warranty
Thankyou for choosing KEF. KEF is dedicated to
producing premium audio products with best-in-
class sound quality to giveyou an engrossing and
pleasurable listeningexperience that is true to the
original performance.
ForKEF latest news and product information
pleasevisitwww.kef.com
KEF products purchased from an authorised KEF
retailerare covered by a warranty. GPAcoustics
(UK) limited and KEF's authorised distributors
provide warranty with avalid proof of purchase.
This warranty is in addition to, and in no way
detractsfrom, your statutory rights as a consumer
underanyapplicable laws governing this warranty.
Garantiebestimmungen
Vielen Dank, dass Sie ein Produktvon KEF
erworben haben. KEF produziert Premium-Audio-
Produkte mit klassenbester Klangqualitat, um
Ihnen ein nahe am Original befmdliches, fesselndes
Horvergnugen zu ermoglichen.
Fur aktuelle Produkt-lnformationen besuchen Sie
bitte die KEF-Webseite: www.kef.com
Alie KEF-Produkte, die bei einem authorisierten
Fachhandlererworben wurden, sind durch eine
Garantie geschutzt. GPAcoustics (UK) und KEFs
authorisierte Distributoren gewahrleisten diese
Garantie gegen Vorlage des Kaufbelegs.
Diese Garantie gilt zusatzlich zu den
unveranderlichen und gesetzlichen
Gewahrleistungsrechten, dieIhnen als Konsument
zustehen.
Forfull details please visit:www.kef.com/support
or contact our CustomerService Department at
[phone] (UK) (charges mayapply
from calls made outside of the UK), by email at
[email protected] or by post at GPAcoustics (UK)
Limited, Eccleston Road, Tovil, Maidstone, Kent,
ME15 6QP, UK for a full copy of the warranty.
GP Acoustics (UK) Limited
Eccleston Road,
Tovil, Maidstone
Kent, ME15 6QP
UK
[phone]
Fur Detailinformationen besuchen Sie bitte
folgende Webseite: www.kef.com/support..
Alternativ konnen Sie unsere ServiceAbteilung
unter der folgendenTelefonnummererreichen:
[phone] (UK). Fur diese Nummer fallen
ublicheAuslands-Telefongebuhren an. Sie konnen
auch eine Email an folgendeAdresse senden
[e-mail], oder uns per Briefpost unter
GP Acoustics (UK) Limited, Eccleston Road, Tovil,
Maidstone, Kent, ME15 6QP, UK kontaktieren, um
Garantieinformationen anzufordern.
GP Acoustics (UK) Limited
Eccleston Road
Tovil, Maidstone
Kent, ME15 6QP
UK
[phone]

GPAcoustics (UK) Limited
Eccleston Road
Tovil, Maidstone
Kent, ME15 6QP
UK
KEF.com