KEF Mu3 User guide
Mu3
Noise Cancelling True Wireless Earphones
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.
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)
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.
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 ≤13d Bm
Bluetooth range 10m
Bluetooth frequency 2.402GHz-2.48GHz
Li-ion rechargeable bat tery 50mAh (earbud)/ 350 mAh (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)
Weight 5.8 g (earbud)
Operating temperature -10°C to 45°C
Power Input DC 5V 60 0mA
33.5 x 62 x 52 mm (charging case)
46.8 g (charging case)
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
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.
02.2 021 | Mu3
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