Home Headphones Sony Wh Xb910N Vs. Kef Mu7

A Review By Comparison of the Sony Wh Xb910N Vs. Kef Mu7

Last updated on Apr 13, 2023   9 minute read
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Reasons why you might like the KEF Mu7

Overall Score 6.4 Represents average audio ecosystem compatibility score.

  • Weight of 309 g
  • Has Active Noise Cancellation (Anc)
  • Battery Life of 40 hours
  • Can Be Used Wirelessly
  • Has Ambient Sound Mode
Sony WH XB910N

Sony WH XB910N

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Reasons why you might like the Sony WH XB910N

Overall Score 6.2 Represents average audio ecosystem compatibility score.

  • Weight of 252 g
  • Has Active Noise Cancellation (Anc)
  • Battery Life of 30 hours
  • Can Be Used Wirelessly
  • Has Ambient Sound Mode

A summary of the review by feature comparison

Category Features KEF Mu7 Sony WH XB910N
DESIGN weight 309g 252g
has a detachable cable
can be folded
has a tangle free cable
cable length 1.2meters
has an over-the-ear foam
has stereo speakers
SOUND QUALITY has active noise cancellation (anc)
has passive noise reduction
lowest frequency 20hz 7hz
highest frequency 20,000hz 25,000hz
sound pressure level 96db/mw 96db/mw
driver unit size 40mm 40mm
impedance 20ohms 48ohms
has a neodymium magnet
POWER battery life 40hours 30hours
charge time 2hours 3.5hours
has a battery level indicator
battery power 100mah
has a rechargeable battery
CONNECTIVITY can be used wirelessly
bluetooth version v5.1 v5.2
has usb type-c
has ldac
has aptx hd
has bluetooth aptx
has aac
maximum bluetooth range 10meters 10meters
has a 3.5mm male connector
MICROPHONE number of microphones 4only 2only
has a noise-canceling microphone
EXTRAS has ambient sound mode
has a mute function
multipoint count 2only 2only
control panel placed on a device
can be used as a headset
warranty period 2years
travel bag is included
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A breakdown of the review per specifications



KEF Mu7 309g
Sony WH XB910N 252g

Sony WH XB910N have a weight of 252g, these weigh below 320g, which we consider as the highest average a headphone should weigh for comfort during long use. We prefer a lower weight better for the reason that lighter devices are more comfortable to carry.

The KEF Mu7, at 309g weigh more than the Sony WH XB910N by 57g

Has A Detachable Cable

Sony WH XB910N

Detachable cables are cables that have connectors on both ends. One end goes into your headphone earpieces, while the other end is inserted into a source device. Some new headphones, and not just the expensive ones, are coming with detachable cables, Sony WH XB910N are one of those.

With a detachable cable, KEF Mu7 too can use alternative cables and if the cable is pulled, it will pop out instead of breaking.

Can Be Folded

Sony WH XB910N

Sony WH XB910N are foldable, which makes them more portable. Foldable headphones are easier to transport and take up less storage space.

Has A Tangle Free Cable

Sony WH XB910N

Twisted headphone cables can be a great source of annoyance and inconvenience, KEF Mu7's cable is designed to minimize tangling. Constant twisting of the cables can also lead to bends in the copper wires, affecting sound quality, or rendering your headphones defective.

Cable Length

Sony WH XB910N 1.2meters

A long cable ensures more freedom of movement, but remember that every cable based on the conducting material used has a certain amount of parasitic resistance, inductance, and capacitance. How much depends on the length and construction. Sony WH XB910N comes with a 1.2meters cable.

Has An Over-The-Ear Foam

Sony WH XB910N

Over-ear headphones have larger earpads that fit around your entire ear Sony WH XB910N have a comfortable full-size form with earcups that fully enclose your ears. This design is loved for its increased sound isolation and the fact that it won't leak sound to your neighbors.

KEF Mu7 with this design offer potential for maximum bass and loudness levels.

Has Stereo Speakers

Sony WH XB910N

Sony WH XB910N have stereo speakers, what this means is that Sony WH XB910N's speakers deliver sound from independent channels on both left and right sides, this creates a richer sound and a better listening experience.

Both KEF Mu7 and Sony WH XB910N have stereo speakers

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Sound Quality

Has Active Noise Cancellation (Anc)

Sony WH XB910N

Active noise cancellation uses more advanced technology to actively counter noise. How it works, it listens to the sound pattern of incoming noise and then inverts the soundwaves to cancel it out. In simple terms, it's like taking +1 outside (noise from your surrounding) and adding -1 inside (counter sound within the device) to make 0 resulting in a reduced level of noise.

Sony WH XB910N allow you to listen at lower volume levels, causing less ear fatigue as you don't have to crank up the volume to overcome background noise.

KEF Mu7 too have active noise cancellation making both devices ideal for plane rides and morning commutes. Each may work with different noise cancellation modes, pick the setting, mode, or noise cancellation type that suits your commute or that enhances your relaxation time.

Has Passive Noise Reduction

Sony WH XB910N

Passive Noise Cancellation uses well-designed ear cups to seal out environment noise. This is used for both in-ear earphones and over-ear headphones where the headphone itself will keep surrounding noise out. The Sony WH XB910N sits tightly in place, creating an acoustic seal that reduces background noise and prevents your music from leaking out.

Both of these devices have passive noise reduction which means that also the KEF Mu7 isolates you from ambient noise instead of actively using technology to cancel it out.

Lowest Frequency

KEF Mu7 20hz
Sony WH XB910N 7hz

Low-frequency response measures if and how well a particular audio component reproduces low audible frequencies and if it makes any changes to the signal while at it. Sony WH XB910N's lowest frequency is at 7Hz, the lower the low-frequency response, the stronger and juicier the bass.

KEF Mu7's lowest frequency is at 20Hz, this means that KEF Mu7 got a juicier bass than the Sony WH XB910N

Highest Frequency

KEF Mu7 20,000hz
Sony WH XB910N 25,000hz

High frequency response measures if and how well an audio component reproduces high audible frequencies and if it changes to the signal while at it. Sony WH XB910N's highest frequency is at 25,000Hz, the higher the high-frequency response, the clearer and crispier the treble.

KEF Mu7's highest frequency is at 20,000Hz, this means that Sony WH XB910N got a clearer and crispier treble than the KEF Mu7

Sound Pressure Level

KEF Mu7 96db/mw
Sony WH XB910N 96db/mw

Sound pressure is the average variation in atmospheric pressure caused by the sound, the sound level .i.e how loud something is can be perceived differently by different people so we need to have a way of getting an objective measurement of sound level expressed in numerical terms.

The sound pressure level, SPL, is the pressure level of a sound, measured in decibels, dB, Sony WH XB910N's measurement is 96dB/mW. Devices with a higher sound pressure level are generally louder when supplied with any given audio source.

KEF Mu7's sound pressure level measurement is 96dB/mW.

Driver Unit Size

KEF Mu7 40mm
Sony WH XB910N 40mm

The driver unit is basically a mini speaker that produces sound in the device, its size dictates the loudness of the headphone. Sony WH XB910N driver unit is 40mm in diameter, bigger drivers are more powerful and can produce better bass.

KEF Mu7 driver unit is 40mm in diameter, making both devices similar in how loud their sound gets , many people have a misconception that driver units of a bigger size automatically produce better sound quality.

However, large drivers usually have difficulty reproducing high frequencies so yes, larger drivers can generate louder sound, but this does not mean that they produce better sound.


KEF Mu7 20ohms
Sony WH XB910N 48ohms

Impedance is the device's resistance to the electromagnetic current, as electricity flows through a conductor, it faces electrical resistance that counters the flow of current. The resistance of a conductor is measured in ohms. Sony WH XB910N's impedance is 48Ohms, the lower the impedance, the easier it is to get higher volume and requires less power.

KEF Mu7's impedance is 20Ohms. The impedance of earbuds is the electrical resistance of the driver unit present on the inside.

Has A Neodymium Magnet

Sony WH XB910N

Neodymium magnets when used in audio devices produce a higher sensitivity and substantial sound output while using less power. They can help produce music at quite a high sound pressure level, SPL, with the use of high magnetic flux. The Sony WH XB910N have this type of magnet.

KEF Mu7 have it too, devices with neodymium magnets are lighter and more powerful than those which use ferrite magnets. It is also known that they have more bass and clear high notes.


Battery Life

KEF Mu7 40hours
Sony WH XB910N 30hours

If your headphones play wirelessly, cancel ambient noise, or enhance your listening experience with active features, their battery life will reduce over time. The device's battery life is given by the manufacturer, with longer battery life, you get to use it for longer and have to charge the device less often. Sony WH XB910N's battery life is 30 hours

KEF Mu7's battery life is 40 hours. Each time you recharge your headphones, they get a little less listening time. The effect is barely noticeable at first. But over a few years, you may find that your device, no longer plays for long like it used to.

Charge Time

KEF Mu7 2hours
Sony WH XB910N 3.5hours

It takes 3.5 hours to fully charge the Sony WH XB910N's battery. It is recommended to fully charge the battery before using the headphones for the first time or when they have been unused for extended periods.

KEF Mu7 takes 2 hours to fully charge the battery

Has A Battery Level Indicator

Sony WH XB910N

Sony WH XB910N have a battery level indicator, an indicator shows you when the device has a low battery. The battery indicator lights indicate the charging status of your headphones.

KEF Mu7 too have a battery level indicator, charging indicators allow you to determine the charging state of your headphones, whether fully charged, or the battery is running low.

Battery Power

KEF Mu7 100mah
Sony WH XB910N

Battery power, or battery capacity, represents the amount of electrical energy that a battery can store. KEF Mu7's battery power is 100mAh, more battery power can be an indication of longer battery life.

Has A Rechargeable Battery

Sony WH XB910N

A rechargeable battery is a type of electrical battery that can be charged, discharged into a load, and recharged many times, as opposed to a disposable or primary battery, which is supplied fully charged and discarded after use. Sony WH XB910N's battery can be recharged and used over again.

The KEF Mu7 too have a rechargeable battery.

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Can Be Used Wirelessly

Sony WH XB910N

Sony WH XB910N can be used wirelessly, wireless devices allow users more freedom of movement.

The KEF Mu7 also can be used wirelessly

Bluetooth Version

KEF Mu7 v5.1
Sony WH XB910N v5.2

Bluetooth is a wireless technology standard that allows data transfers between devices placed in close proximity, using short-wavelength, ultra-high frequency radio waves. Sony WH XB910N has a v5.2

KEF Mu7 has a Bluetooth version of v5.1. Newer versions provide faster data transfers.

Has Usb Type-C

Sony WH XB910N

Sony WH XB910N support USB TYPE-C, an industry-standard connector for transmitting both data and power on a single cable. The USB-C plug is now part and parcel of most current laptops, phones, and tablets, it features reversible plug orientation and cable direction.

KEF Mu7 too have USB TYPE-C

Has Ldac

Sony WH XB910N

Sony WH XB910N support LDAC, a codec developed by Sony which allows streaming high-resolution audio over Bluetooth connections at up to 990 kbps at 32 bit/96 kHz. It is capable of a very high bitrate of 990kbps, which provides high-resolution audio.

Has Aptx Hd

Sony WH XB910N

The KEF Mu7 support APTX HD, an audio codec for Bluetooth devices that are developed by Qualcomm. It supports high-quality 24-bit audio (at a bit rate of 576kbps).

Has Bluetooth Aptx

Sony WH XB910N

KEF Mu7 support APTX, a codec used for transmitting audio wirelessly with Bluetooth. It is developed by Qualcomm and supports 16-bit audio at a bit rate of 384kbps.

Has Aac

Sony WH XB910N

Sony WH XB910N support AAC, a codec that is used for Bluetooth audio. It supports 24-bit audio at 250kbps. Because it uses psychoacoustic modeling, it can provide better results than other codecs at a similar bit rate.

The KEF Mu7 support AAC as well. Designed to be the successor of the MP3 format, AAC generally achieves higher sound quality than MP3 encoders at the same bit rate.

Maximum Bluetooth Range

KEF Mu7 10meters
Sony WH XB910N 10meters

Bluetooth is a short-range wireless technology standard that is used for exchanging data between fixed and mobile devices over short distances. The Sony WH XB910N can connect at a 10meters distance via Bluetooth or infrared to another device.

The KEF Mu7 can connect at a 10meters distance via Bluetooth

Has A 3.5Mm Male Connector

Sony WH XB910N

Being an industry standard audio plug, a standard 3.5mm male connector is suitable for use with all MP3 players and computer sound cards. This means that it is commonly used in stereo headphones to your phone or connecting your phone to an external amplifier, sound bars, your car radio, etc. Sony WH XB910N has this connector giving it a wider range of connectivity with most of the sound devices out there. All plugs have at least a tip and sleeve with the number of rings that stand as a differentiating factor.

KEF Mu7 too have this kind of connector


Number Of Microphones

KEF Mu7 4only
Sony WH XB910N 2only

Sony WH XB910N have only 2 microphones, more microphones result in better sound quality and enable the device to filter out background noise.

The KEF Mu7 microphones are only 4.

Has A Noise-Canceling Microphone

Sony WH XB910N

Sony WH XB910N use a noise-canceling type of microphone, these microphones are designed to filter out background noise from the desired sound. Especially useful in noisy environments.

The KEF Mu7 too use a noise-canceling type of microphone.

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Has Ambient Sound Mode

Sony WH XB910N

Sony WH XB910N support ambient sound mode, which uses microphones to pass through ambient noises so that they can still be heard. It’s useful when you want to listen to music but also be aware of what’s happening around you, for example when you’re having a jog but would still want to be able to hear traffic.

The KEF Mu7 support ambient sound mode as well allowing you to hear the ambient sound even while wearing them.

Has A Mute Function

Sony WH XB910N

Sony WH XB910N have a mute function, they have an option to mute/unmute a conversation directly from the device. The mute function means that you unilaterally turn off the microphone, but you can still hear the other party's voice.

The KEF Mu7 too have a mute function.

Multipoint Count

KEF Mu7 2only
Sony WH XB910N 2only

Sony WH XB910N support multipoint, which allows you to link to more Bluetooth devices and switch between them. For example, you can easily switch calls from one device to another without having to manually disconnect and reconnect.

The KEF Mu7 support multipoint count. Bluetooth multipoint would come in handy because you can be on one call without missing notifications coming from another device.

Control Panel Placed On A Device

Sony WH XB910N

There is a control panel on the Sony WH XB910N body, so you can easily access the volume control or remote without having to interact with a cable or another device it's connected to.

The KEF Mu7 too have a control panel on them.

Can Be Used As A Headset

Sony WH XB910N

Sony WH XB910N can be used as a headset. A headset is one headphone or pair with a built-in microphone. Headsets can be used for apps that require communication i.e. Zoom, Google Meet, Skype, games with voice chat, mobile phones, etc.

KEF Mu7 can be used as a headset. since they have a built-in microphone

Warranty Period

Sony WH XB910N 2years

The period of time that warrant free repair and adjustment services in case of a malfunction occurring under normal use that has followed instruction manuals. When covered under the manufacturer’s warranty it is possible to get a replacement in the case of a malfunction. Sony WH XB910N have a warranty period of 2 years

Travel Bag Is Included

Sony WH XB910N

Carrying headphones without a case, or putting them in bags without a casing can easily put them at risk of getting damaged. The KEF Mu7 come with their own special case or pouch, which is useful for safe transportation.

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