Soundbars / Compare

KEF XIO vs Sonos Arc Ultra

A

Product A: KEF

XIO

65 of 98 known

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B

Product B: Sonos

Arc Ultra

60 of 98 known

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All 98 fields

Every value links to where we found it.

Only differences

AKEF XIO

BSonos Arc Ultra

Audio system

10 of 17 differ

System channel configurationiMaker-stated channel layout of the exact package, such as 5.1.2. This can include virtual channels. It is not a count of physical drivers. Optional speakers do not count.

5.1.21Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Product title and spec table: 5.1.2, up to 5.1.2 output channels.

9.1.42Owner's manualsonos.com/en-us/guides/arcultraRead 8 October 2026Maker-advertised standalone spatial-audio layout. Includes virtual channels. It is not the physical driver layout. RTINGS describes the physical layout as 5.1.2.

Physical drivers in the packageiCount of physical active speaker drivers across the supplied bar, subwoofer and rear speakers. Passive radiators, microphones and virtual channels do not count. A coaxial driver, such as KEF Uni-Q, counts once, as makers count it.

121Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026All drivers are in the bar. No subwoofer or rear speakers are supplied.

142Owner's manualsonos.com/en-us/guides/arcultraRead 8 October 2026Standalone reference package has no supplied external subwoofer or rear enclosures. Same active drivers as the bar.

Physical drivers in the bariCount of physical active speaker drivers in the soundbar alone. Passive radiators and virtual channels do not count. A coaxial driver, such as KEF Uni-Q, counts once, as makers count it.

121Maker product pageus.kef.com/products/xio-soundbarRead 15 October 20266 Uni-Q MX plus 2 full-range plus 4 P185 drivers. Each Uni-Q MX counts once, as KEF counts it. KEF also states 12 Class D amplifier channels, 8 for the HF/MF drivers and 4 for the P185 drivers.

142Owner's manualsonos.com/en-us/guides/arcultraRead 8 October 2026Active drivers only. Seven tweeters, six midwoofers and one Sound Motion woofer. Two membranes and four motors do not make the Sound Motion assembly multiple drivers.

Up-firing drivers in the packageiPhysical active drivers explicitly firing upwards across the supplied package. Virtual height channels and passive radiators do not count. A driver that fires upwards only when the bar is wall mounted is not counted.

21Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Page: two Uni-Q MX drivers support the two overhead channels. A third Uni-Q MX on the top face is used only when the bar is wall mounted. Three reviews describe this. The count is the two overhead drivers in the standard shelf position.5Maker spec sheet (PDF)images.salsify.com/image/upload/s--BaxUJ50x--/490b1abdf40cac67829ed9c59a357e1827c56377.pdfRead 15 October 2026Brochure: two Uni-Q MX drivers dedicated to the overhead channels complete the 5.1.2 layout.9Reviewwhathifi.com/tv-home-cinema/soundbars/kef-xioRead 15 October 2026Review: three Uni-Q MX drivers sit on the top. The centre one is used only when the bar is wall mounted.

22Owner's manualsonos.com/en-us/guides/arcultraRead 8 October 2026

Driver layoutiPublished physical driver layout for the supplied components. A row names one driver type in one component. Do not translate channel count into driver count.

AKEF XIO

Component	Driver type	Count	Diameter (mm)	Orientation
Soundbar	Uni-Q MX coaxial driver	6	50	Three front-facing and three top-facing on a shelf. One top-facing driver is used only when the bar is wall mounted.
Soundbar	Full-range driver	2	50	Not available
Soundbar	P185 racetrack bass driver with VECO	4	Not available	Two opposed pairs in a force-cancelling layout

Source1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Spec table: 6 x 50 mm Uni-Q MX drivers, 2 x 50 mm full-range drivers and 4 P185 racetrack bass drivers of 50 x 180 mm with VECO. The racetrack driver has no round diameter, so none is stored. Orientation comes from the reviews listed below.9Reviewwhathifi.com/tv-home-cinema/soundbars/kef-xioRead 15 October 2026Review: three Uni-Q MX face forward and three sit on top. The four P185 drivers form two pairs facing opposite directions. T3 says two drivers fire upward on a shelf. StereoNET says five of the six Uni-Q MX work at one time.

BSonos Arc Ultra

Component	Driver type	Count	Orientation
Soundbar	Silk-dome tweeter	5	Angled
Soundbar	Silk-dome tweeter	2	Up-firing
Soundbar	Midwoofer	6	Not available
Soundbar	Sound Motion woofer	1	Not available

Source2Owner's manualsonos.com/en-us/guides/arcultraRead 8 October 2026Manual and product-page Audio specifications. Five angled tweeters and two up-firing tweeters split the published seven. No diameters are published.

Separate subwoofer includediA separate powered subwoofer is supplied with the reference package. A built-in woofer does not count.

No4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026No subwoofer is in the box. The bar has an RCA output and a wireless output for an optional subwoofer.

No1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026Complete standalone-bar box contents. Separate Sonos subwoofers are optional.

Included subwoofer connectioniAudio link used by the supplied separate subwoofer. Wireless subwoofers can still require an AC power cable.

Not available

Not available

Included subwoofer driver diameteriPublished diameter of an active driver in the supplied separate subwoofer. Do not use enclosure size or passive radiator size.

Not available

Not available

Rear speakers includediCount of separate rear speaker enclosures supplied with the reference package. Detachable bar ends count when usable as rears. Optional rear speakers do not count.

04Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026No rear speakers are in the box.

01Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026Complete standalone-bar box contents. Rear speakers are optional.

Included rear speaker connectioniAudio link to the supplied rear speaker enclosures. Their power connection is separate.

Not available

Not available

Detachable rear speakersiThe bar has supplied detachable end sections usable as separate rear speakers.

No4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026The bar is one piece. A wireless surround feature with KEF speakers is announced for a later firmware update.

Not available

Compatible optional subwoofersiMaker-named compatible additional subwoofer models. These do not contribute to the reference package layout, dimensions or measurements.

Not available

Sub (Gen 1), Sub (Gen 2), Sub (Gen 3), Sub 4, Sub Mini10Maker product pagesupport.sonos.com/en-us/article/set-up-your-sonos-subRead 8 October 2026Sub 1/2/3 support all home theater speakers. Sub 4 supports all except Playbar/Playbase. Sub Mini has separate support list. Arc Ultra dual-Sub setup requires two Sub 4/Gen 3 units, not Gen 1/2.11Maker product pagesupport.sonos.com/en-us/article/sonos-products-that-support-sub-miniRead 8 October 2026Home Theater list explicitly includes Arc Ultra, Beam (Gen 2) and Ray for Sub Mini.

Compatible optional rear speakersiMaker-named compatible additional rear speaker models. These do not contribute to the reference package layout, dimensions or measurements.

Not available

Era 100, Era 30013Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026Optional Sonos rear-speaker sets on the product page. Supplied package remains the standalone bar.

Total RMS audio output poweriMaker-stated RMS or rated continuous amplifier output for the exact supplied package. Peak or unspecified maximum claims do not qualify. Distortion, load and rating conditions belong in the source note. Power consumption is separate.

Not available

Not available

Total peak audio output poweriMaker-stated peak or maximum amplifier output for the exact supplied package. This is separate from RMS or continuous output and from electrical consumption. Rating conditions belong in the source note.

820W1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026EU spec table: 820 W instantaneous total power rating. No RMS figure is published. The US page does not show the amplifier row.

Not available

Published frequency response lower limitiMaker-published lower limit for the exact supplied package. Tolerance and test conditions belong in the source note. Reviewer extension measurements are separate.

34Hz1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Spec table: 34 Hz to 20 kHz at plus or minus 3 dB, measured at 85 dB at 1 m.

Not available

Published frequency response upper limitiMaker-published upper limit for the exact supplied package. Tolerance and test conditions belong in the source note.

20kHz1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Same row as the lower limit.

Not available

Audio formats

7 of 9 differ

Dolby AtmosiExplicit support for Dolby Atmos playback. Transport codec and connection restrictions belong in source notes.

Yes1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Spec table lists Dolby Atmos.

Yes1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026Dolby Atmos via Dolby Digital Plus uses ARC or eARC. Dolby TrueHD and Dolby MAT Atmos require eARC.

DTS:XiExplicit support for DTS:X playback. Virtual surround processing alone does not establish DTS:X decoding.

Yes1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Spec table lists DTS:X.

No15Press articletechradar.com/televisions/soundbars/sonys-new-dolby-atmos-soundbar-does-all-the-things-the-sonos-arc-ultra-doesnt-for-a-lower-price-and-its-expandable-for-home-theater-like-sonos-tooRead 8 October 2026Explicitly states DTS:X is unsupported by Sonos.

Supported audio formatsiAudio formats explicitly decoded by the device. Codec and connection restrictions belong in source notes. Bluetooth codecs and music-file formats are separate.

Dolby Atmos, Dolby TrueHD, Dolby Digital Plus, DTS:X, Sony 360 Reality Audio, MPEG-H, LPCM1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Spec table lists Dolby Atmos, DTS:X, 360 Reality Audio, MPEG-H and LPCM. The FAQ also names Dolby TrueHD and Dolby Digital Plus over eARC when the TV supports them.

Stereo PCM, Dolby Digital, DTS Digital Surround, Dolby Digital Plus, Dolby Atmos (Dolby Digital Plus), Dolby Atmos (Dolby TrueHD), Dolby TrueHD, Multichannel PCM, Dolby Multichannel PCM, Dolby Atmos (Dolby MAT)4Maker product pagesupport.sonos.com/en-us/article/supported-home-theater-audio-formatsRead 8 October 2026Current Sonos app. Dolby TrueHD, multichannel PCM and MAT require eARC. DTS Digital Surround is not an indication of a licensed decoder.

Audio formats by connectioniExplicitly supported audio decoding combinations. Max input channels counts decoded input audio channels, including LFE. A 5.1 layout has 6 channels and 7.1 has 8. Output speaker layouts and Atmos objects do not count. Atmos over Dolby Digital Plus and over Dolby TrueHD are separate rows. Format support on one input does not prove support on another.

AKEF XIO

Connection	Format	Max input channels
HDMI eARC	5.1 Surround (compressed)	6
HDMI eARC	5.1 Surround (uncompressed)	6
HDMI eARC	Dolby Atmos	Not available
HDMI eARC	DTS:X	Not available
HDMI eARC	Sony 360 Reality Audio	Not available
HDMI eARC	MPEG-H	Not available
HDMI ARC	5.1 Surround (compressed)	6
HDMI ARC	Dolby Atmos	Not available
HDMI ARC	MPEG-H	Not available
Optical	5.1 Surround (compressed)	6
Network	5.1 Surround (compressed)	6
Network	Dolby Atmos	Not available
Network	DTS:X	Not available
Network	Sony 360 Reality Audio	Not available
Network	MPEG-H	Not available

Source4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026Section 11.1 Compatibility with XIO (printed page 90). Optical: compressed 5.1 only. HDMI eARC: compressed and uncompressed 5.1, Dolby Atmos, DTS:X, Sony 360 Reality Audio and MPEG-H. HDMI ARC: compressed 5.1, Dolby Atmos and MPEG-H. Wireless: compressed 5.1 and all four object formats. The wireless column is stored as the network connection. Compatibility depends on the source and the content. A 5.1 layout has 6 channels. The table gives no channel count for the object formats.

BSonos Arc Ultra

Connection	Format
HDMI ARC	Stereo PCM
HDMI ARC	Dolby Digital
HDMI ARC	DTS Digital Surround
HDMI ARC	Dolby Digital Plus
HDMI ARC	Dolby Atmos (Dolby Digital Plus)
HDMI eARC	Stereo PCM
HDMI eARC	Dolby Digital
HDMI eARC	DTS Digital Surround
HDMI eARC	Dolby Digital Plus
HDMI eARC	Dolby Atmos (Dolby Digital Plus)
HDMI eARC	Dolby TrueHD
HDMI eARC	Dolby Atmos (Dolby TrueHD)
HDMI eARC	Multichannel PCM
HDMI eARC	Dolby Multichannel PCM
HDMI eARC	Dolby Atmos (Dolby MAT)

Source4Maker product pagesupport.sonos.com/en-us/article/supported-home-theater-audio-formatsRead 8 October 2026Ray has an optical audio input. ARC/eARC combinations are stated for Arc Ultra and Beam (Gen 2). Optical adapter paths for the HDMI bars are not treated as native optical ports.

Music file formatsiPublished local or network music-file playback formats. Playback route and app restrictions belong in source notes.

FLAC, WAV, AIFF, ALAC, AAC, WMA, MP3, M4A, LPCM, Ogg Vorbis1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Spec table: FLAC, WAV, AIFF, ALAC, AAC, WMA, MP3, M4A, LPCM and Ogg Vorbis. Playback runs over the network and depends on the source device.

MP3, MP4, M4A, WMA, AAC, HE-AAC, OGG, FLAC, ALAC, AIFF, WAV5Maker product pagesupport.sonos.com/en-us/article/supported-audio-formats-for-sonos-music-libraryRead 8 October 2026Local network music-library playback through the current Sonos app. Mono or stereo files. This is separate from HDMI/optical theater formats.

Max wired audio sample rateiHighest explicitly published supported sample rate for decoded wired audio input. Name the exact HDMI, ARC, eARC or optical connection and codec in source notes. This is the published route limit, not proof of a device-wide maximum across all inputs. Local or network music-file limits and Bluetooth do not qualify. A chipset limit is not device evidence.

192kHz1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Spec table: HDMI eARC up to 192 kHz and 24 bit. Optical is limited to 96 kHz and 24 bit.

Not available

Max music file sample rateiHighest explicitly published supported local or network music-file sample rate. Name the playback route and file format in source notes. This is the published route and format limit, not proof of a device-wide maximum across all music formats. Wired HDMI or optical input and Bluetooth are separate.

384kHz1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Spec table: network up to 384 kHz and 24 bit, depending on the source resolution.

48kHz5Maker product pagesupport.sonos.com/en-us/article/supported-audio-formats-for-sonos-music-libraryRead 8 October 2026Published local music-library maximum. Not a claim that HDMI/optical input rates match this route.

Max wired audio bit depthiHighest explicitly published supported bit depth for decoded wired audio input. Name the exact HDMI, ARC, eARC or optical connection and codec in source notes. This is the published route limit, not proof of a device-wide maximum across all inputs. Local or network music-file limits and Bluetooth do not qualify.

24bits1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Same row as the eARC sample rate. All routes are 24 bit.

Not available

Max music file bit depthiHighest explicitly published supported local or network music-file bit depth. Name the playback route and file format in source notes. This is the published route and format limit, not proof of a device-wide maximum across all music formats. Wired HDMI or optical input and Bluetooth are separate.

24bits1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Network route, 24 bit.

24bits5Maker product pagesupport.sonos.com/en-us/article/supported-audio-formats-for-sonos-music-libraryRead 8 October 2026FLAC and ALAC local network music-library playback on the current app. AIFF and WAV are limited to 16 bits.

Connectivity

3 of 17 differ

Ports on the bariPhysical connectors on the soundbar alone. Record input, output, ARC or eARC, service, subwoofer and power roles explicitly. Count identical connectors per row. Component connectors are described in source notes.

AKEF XIO

Connector	Count	Version	Role
HDMI	1	2.1 eARC	HDMI eARC and ARC connection to the TV. There is no HDMI input.
Optical	1	Not available	TOSLINK digital audio input
Ethernet	1	Not available	RJ45 network port
USB-C	1	Not available	Service port
Subwoofer	1	Not available	RCA subwoofer output
AC power	1	Not available	AC power input

Source1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Inputs: HDMI 2.1 eARC, TOSLINK optical, USB Type C for service and RJ45 Ethernet. Outputs: wireless subwoofer output and RCA subwoofer output. The wireless output is a radio link to the KW2 RX receiver and not a connector. The back panel photo in the manual also shows the AC input.4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026Quick start guide back panel: reset button, Bluetooth pairing button, IPT switch, power switch, service port, subwoofer output, optical input, AC input, HDMI eARC input and network port.

BSonos Arc Ultra

Connector	Count	Version	Role
HDMI	1	Not available	TV audio return input (ARC/eARC)
Ethernet	1	10/100 Mbps	Network input
AC power	1	Not available	Mains power input

Source2Owner's manualsonos.com/en-us/guides/arcultraRead 8 October 2026User guide Connector panel. HDMI is a TV audio return port and not a source-input/video-passthrough port. Optical adapter is not a native optical socket.

HDMI ARC

Yes1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026

Yes1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026

HDMI eARC

Yes1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Spec table: HDMI 2.1 eARC. The same port also carries ARC.

Yes1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026

HDMI-CEC

Yes4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026Section 6.1: turn on HDMI CEC in the TV settings.

Yes12Maker product pagesupport.sonos.com/en-us/article/tv-requirements-for-sonos-home-theater-speakersRead 8 October 2026TV control uses the HDMI ARC/eARC link. CEC control is unavailable through the optical adapter.

HDMI video passthroughiCan pass video from a dedicated HDMI source input to a television output. ARC or eARC alone does not qualify.

No4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026The only HDMI connector is the eARC and ARC connection to the TV. FAQ 8: the HDMI port is for connecting to a TV and not for sources.

No15Press articletechradar.com/televisions/soundbars/sonys-new-dolby-atmos-soundbar-does-all-the-things-the-sonos-arc-ultra-doesnt-for-a-lower-price-and-its-expandable-for-home-theater-like-sonos-tooRead 8 October 2026Explicitly says Arc Ultra lacks HDMI video passthrough.

Video passthrough modesiPublished supported passthrough combinations, not inferred maxima at untested resolutions. State chroma, bit depth, HDR and firmware restrictions in source notes.

Not available

Not available

HDR passthrough formats

Not available

Not available

VRR passthrough

Not available

Not available

ALLM passthrough

Not available

Not available

HDCP versioniHighest HDCP version the maker states for an HDMI port of the soundbar, such as 2.3. When the source inputs and the TV output differ, the source input version is stored. A bar with no HDMI input stores the version of its TV output, also when that output carries video from a built-in streaming player.

Not available

Not available

Bluetooth audio inputiCan receive audio from a Bluetooth source. A Bluetooth remote alone does not qualify.

Yes1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026

Yes1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026

Bluetooth versioniPublished version of the soundbar audio connection. An optional remote or detachable rear can use a different version.

5.31Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Spec table: Bluetooth 5.3. No codec list is published.

5.31Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026

Bluetooth audio codecsiExplicitly supported codecs for received Bluetooth audio. A Bluetooth version alone does not establish a codec.

Not available

Not available

Wi-Fi

Yes1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026

Yes1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026

Wi-Fi standardiPublished Wi-Fi standards for the soundbar, written as 802.11 names without IEEE, such as "802.11a/b/g/n/ac/ax". A Wi-Fi generation is written as its standard, so Wi-Fi 5 is "802.11ac" and Wi-Fi 6 is "802.11ax". Do not infer the standard from frequency bands.

802.11a/b/g/n/ac/ax1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Spec table: IEEE 802.11a/b/g/n/ac/ax. The manual router requirements list 802.11a/b/g/n/ac. The spec table is used.

802.11a/b/g/n/ac/ax3Maker product pagesupport.sonos.com/en-us/article/supported-wifi-modes-and-security-standards-for-sonos-productsRead 8 October 2026Dedicated device-mode support list. General user-guide router compatibility text is not device-protocol evidence.

Wi-Fi bandsiPublished radio bands, such as 2.4 GHz and 5 GHz.

2.4 GHz, 5 GHz, 6 GHz1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Spec table: 2.4 GHz, 5 GHz and 6 GHz.

2.4 GHz, 5 GHz3Maker product pagesupport.sonos.com/en-us/article/supported-wifi-modes-and-security-standards-for-sonos-productsRead 8 October 2026Router uplink bands from the dedicated support list. Surround speaker radio links are separate.

Built-in Ethernet speediRated speed of the built-in port. An optional adapter does not count.

Not available

100Mbps1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026

Streaming and control

6 of 8 differ

Streaming protocolsiNamed network playback protocols, such as AirPlay 2, Google Cast, Spotify Connect and Tidal Connect. Bluetooth is separate.

AirPlay 2, Google Cast, Spotify Connect, Tidal Connect, UPnP, QPlay1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Spec table: KEF Connect, AirPlay, Google Cast, UPnP and Bluetooth. Streaming services: Spotify via Spotify Connect, Tidal via Tidal Connect and QQ Music via QPlay. The features list names multiroom through AirPlay 2 and Google Cast.

AirPlay 2, Spotify Connect, Tidal Connect1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 202614Reviewwhathifi.com/reviews/sonos-arc-ultraRead 8 October 2026Tech specs identify Spotify Connect and Tidal Connect. AirPlay 2 confirmed by maker.

Voice assistantsiNamed assistants supported by the soundbar. Built-in and external-device routes and market restrictions belong in source notes.

Siri, Google Assistant4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026Section 7.4: Siri controls playback while an iOS device streams to the XIO. Google Assistant does the same for an Android device. The bar has no built-in assistant and What Hi-Fi? lists no voice control.

Sonos Voice Control, Amazon Alexa1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026Built-in voice services. Availability varies by country and language.

Built-in microphoneiPhysical microphone in the bar for voice or calibration. An external setup phone or remote microphone does not count.

Yes9Reviewwhathifi.com/tv-home-cinema/soundbars/kef-xioRead 15 October 2026Review: built-in microphones allow the XIO to measure the room and detect walls and furniture. Tom's Guide and T3 also mention built-in microphones. The maker pages do not state a microphone.

Yes1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026

Microphone mute controliA physical control on the soundbar explicitly disables its built-in voice microphone. State whether this is an electrical switch or software-controlled button when known.

Not available

Yes1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026Rear physical switch disconnects power to the microphones.

Companion apps

KEF Connect4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026The KEF Connect app sets up and controls the bar.

Sonos1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026

Companion app platforms

iOS, Android4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026Section 4.4.1: KEF Connect for iOS 14 or above and Android 10 or above.

iOS, iPadOS, Android, Fire OS, macOS, Windows, Web6Maker product pagesupport.sonos.com/en-us/article/sonos-app-requirementsRead 8 October 2026Current app: iOS/iPadOS 18+, Android 10+, Fire OS 7+. Desktop macOS 10.12+/Windows 8+. Desktop and web have limited system setup features. Mobile iOS or Android required for initial setup.

Multiroom audioiCan play synchronised audio with other rooms through a supported network platform. Optional surround expansion alone does not qualify.

Yes1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Features list: multiroom via AirPlay 2 and Google Cast. TechRadar says the bar has no multiroom option. The maker and the manual say it has.4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026Section 7.3 Multi-Room Streaming: AirPlay and Google Cast groups.

Yes13Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026

Remote includediA separate remote control supplied with the reference package. Phone apps and TV remotes do not count.

Yes4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026In the Box: remote control with two AAA batteries.

No1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026Complete box contents contain no separate remote. Control uses a TV remote, touch controls or the app.

Sound processing

3 of 7 differ

Sound modes

Default, Music, Movie, Night, Dialogue, Direct4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026Section 10.4.5 sound profiles: Default, Music, Movie, Night, Dialogue and Direct. The remote has two sound profile buttons that default to Dialogue and Night.

Speech Enhancement, Night Sound1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026

Automatic room calibrationiExplicit acoustic measurement or analysis used to adapt playback to the room. Manual EQ alone does not qualify. Setup phone requirements belong in source notes.

Yes4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026Section 10.4.2 Calibrate with IPT: it adjusts the EQ to the listening environment in about 45 seconds. The app also asks for the soundbar height and the room size.

Yes1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026Trueplay measures room acoustics. Quick tuning works with Android or iOS. Advanced tuning requires an iOS device.

Room calibration system

Intelligent Placement Technology (IPT)4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026Section 10.4.2 names Intelligent Placement Technology.

Trueplay1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026

Dialogue enhancementiA dialogue or voice mode counts, also when the maker lists it as an EQ preset.

Yes4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026Dialogue sound profile: it emphasises vocal frequencies and reduces background noise.

Yes1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026

Night mode

Yes4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026Night sound profile: it compresses the dynamic range for quiet listening.

Yes1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026

Equalizer controlsiPublished user-adjustable EQ controls. Bass and treble controls are distinct from multi-band EQ.

Treble trim, Bass extension, High-pass frequency, Subwoofer low-pass frequency, Subwoofer gain4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026Section 10.4.4 Expert Mode: Treble Trim minus 3.0 to plus 3.0 dB, Bass Extension Less, Standard or Extra, High-Pass Frequency 50 to 120 Hz, Sub Out Low-Pass Frequency 40 to 250 Hz and Sub Gain minus 3.0 to plus 3.0 dB.

Bass, Treble, Loudness1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026

TV speaker integrationiNamed features allowing compatible television speakers to play with the bar. TV models and connection requirements belong in source notes.

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Power

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Published operating poweriMaker-published operating electrical consumption of the soundbar alone. Included subwoofer and rear-speaker consumption do not count. Keep workload and method in source notes. Audio amplifier output is separate.

400W1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026US spec table: 400 W maximum operating power. The EU page says 401 W. The manual says 400 W and is used. Idle power is 20 W.

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Published standby poweriMaker-published non-networked standby consumption of the bar alone. Networked standby and other components are separate.

0.45W4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026Section 15.5: Non wireless mode standby 0.45 W with HDMI auto wake-up. The spec table says under 0.5 W for Non Wi-Fi mode. The same section lists Non Wi-Fi mode standby as 1.5 W, so the 0.45 W row is used as the bar with all radios off.

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Published networked standby poweriMaker-published networked standby consumption of the bar alone. Enabled radio and network conditions belong in source notes.

1.8W4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026Section 15.5: ECO Standby (Network Standby) 1.8 W. The spec table says under 2.0 W. Standby with high power is 3 W.

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Power supplyiPublished AC input range or external DC adapter arrangement. Electrical input ratings are not operating consumption.

AC 100-240 V, 50/60 Hz1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Spec table: power input 100-240 V AC, 50/60 Hz.

100-240 V AC, 50/60 Hz, internal power supply1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026

Detachable rear battery lifeiMaker-stated runtime of the supplied detachable rear speakers. Volume, mode and recharge conditions belong in source notes.

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Detachable rear charge timeiMaker-stated full recharge time of supplied detachable rear speakers. Charging route belongs in source notes.

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Measured

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Low-frequency extension (measured)iReviewer-measured lower extension for the exact tested package. Test threshold, mode, room correction and configuration belong in source notes.

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High-frequency extension (measured)iReviewer-measured upper extension for the exact tested package. Test threshold and configuration belong in source notes.

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Max sound pressure (measured)iReviewer-measured maximum sound pressure. Signal, distance, sound mode and supplied or optional speaker configuration belong in source notes.

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Frequency response deviation (measured)iReviewer-measured standard error against the stated target. Target, averaging range, preset and test method belong in source notes.

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Measured latencyiReviewer-measured audio latency. Keep source/TV, firmware, codec, synchronisation correction and exact tested speaker configuration in source notes. Negative offsets are valid when the method reports them.

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Operating power (measured)iReviewer-measured operating consumption of the soundbar alone. Optional or supplied external speakers do not count. Workload and enabled radio conditions belong in source notes.

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Standby power (measured)iReviewer-measured bar-only standby consumption. Network state and test conditions belong in source notes.

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Soundbar weight (measured)iReviewer-measured bar-only weight. Excludes subwoofer, rears, mounting hardware and cables.

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Dimensions and weight

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Soundbar dimensionsiBar alone in its normal tabletop orientation, without detachable rears, wall brackets or external cables. A source that includes detachable ends must use component_dimensions instead. A size labelled L x W x H, as on Amazon, is width x depth x height.

Width1,210Height70Depth165mm(47.6 × 2.8 × 6.5 in)1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Spec table: 70 x 1210 x 165 mm (H x W x D), 2.8 x 47.6 x 6.5 inches.

Width1,178Height75Depth110.6mm(46.4 × 3 × 4.4 in)2Owner's manualsonos.com/en-us/guides/arcultraRead 8 October 2026Current user guide Specifications, bar in tabletop orientation.

Soundbar weightiBar alone, without detachable rears, subwoofer, wall brackets or external cables. Source-published masses including detachable ends belong in component_dimensions.

10,500g(23.1 lb)1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Spec table: 10.5 kg (23.1 lbs).

5,900g(13 lb)2Owner's manualsonos.com/en-us/guides/arcultraRead 8 October 2026Current user guide Specifications, bar alone. Kilograms converted exactly to grams.

Component dimensions and weightiPublished dimensions and mass for named supplied components, including a bar with detachable rears attached when stated. Each row describes one enclosure, not the pair, unless the component label explicitly states a set. Width, height and depth use normal installed orientation.

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Package dimensions

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Package weightiShipping package including supplied components and packaging.

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Wall mountable

Yes4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026Section 4.6: wall mounting with the supplied template and brackets. The bar can also stand on a TV cabinet.

Yes1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026

In the box

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In the box

XIO soundbar, Remote control, AAA batteries, HDMI cable (2 m), Power cable (2 m), Wall mounting template, Wall mounting kit, Printed materials4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026In the Box (printed page 7): XIO, remote control, AAA batteries, printed materials, HDMI cable (2 m), power cable (2 m), wall mounting template and wall mounting kit. The kit drawing shows two small parts, each marked x4.

Sonos Arc Ultra, Power cable, HDMI cable, Setup guide, Legal and warranty information1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026Product page Box Contents lists the standalone bar package.

Wall mount hardware includediSupplied bar mounting brackets or mount. Screws alone do not establish that a complete mount is included.

Yes4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026Wall mounting template and wall mounting kit are in the box.5Maker spec sheet (PDF)images.salsify.com/image/upload/s--BaxUJ50x--/490b1abdf40cac67829ed9c59a357e1827c56377.pdfRead 15 October 2026Brochure: the soundbar includes a wall-mount kit as a default feature.

No1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026Sonos wall mount is sold separately.

HDMI cable included

Yes4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026HDMI cable of 2 m is in the box.

Yes1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026

Optical cable included

No4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026No optical cable appears in the In the Box page.

No1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026Optical audio adapter sold separately. No optical cable supplied.

General

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Series

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Model numbersiMaker identifiers for this exact model and its listed variants. Excludes sibling models and other generations.

SP4083M0AA, SP4083B0AA, SP4083M0BA, SP4083B0BA, SP4083M0CA, SP4083B0CA1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026US store lists SP4083M0CA for Silver Grey and SP4083B0CA for Slate Black. The UK store lists the BA models and the EU store the AA models. All six are stored.2Maker product pageuk.kef.com/products/xio-soundbarRead 15 October 2026UK store lists SP4083M0BA and SP4083B0BA.3Maker product pageeu.kef.com/products/xio-soundbarRead 15 October 2026EU store lists SP4083M0AA and SP4083B0AA.

ARCG2US1BLK, ARCG2US11Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026Maker ProductGroup JSON-LD lists the black and white US standalone soundbar SKUs.

GTIN / EAN

637203051142, 637203051210, 637203051159, 637203051227, 637203051166, 6372030512341Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026Barcodes (gtin12) from the page data of each store. US 637203051166 (Silver Grey) and 637203051234 (Slate Black). UK 637203051159 and 637203051227. EU 637203051142 and 637203051210.2Maker product pageuk.kef.com/products/xio-soundbarRead 15 October 2026UK barcodes 637203051159 (Silver Grey) and 637203051227 (Slate Black).3Maker product pageeu.kef.com/products/xio-soundbarRead 15 October 2026EU barcodes 637203051142 (Silver Grey) and 637203051210 (Slate Black).

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AnnouncediThe maker's first announcement of this model. This is separate from first retail availability.

8 July 20256Press articlecepro.com/news/xio-soundbar-from-kef-complements-modern-smart-home-living/619921Read 15 October 2026CEPro article of 8 July 2025 reports the new XIO soundbar from KEF. UK early access for members started the same day.

15 October 20249Press releasenewsroom.sonos.com/254655-sonos-reveals-arc-ultra-its-new-soundbar-featuring-sound-motionRead 8 October 2026

Status

Available1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026The product page is live in every store and lists a price.

Available1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026

PredecessoriThe model this one directly replaced, in the same line, tier and size, as the maker or a trusted review names it.

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Sonos Arc16Reviewwhathifi.com/reviews/sonos-arcRead 23 October 2026What Hi-Fi says the Sonos Arc was discontinued and replaced by the Arc Ultra.

SuccessoriThe model that directly replaced this one, in the same line, tier and size. A revision such as a Slim or OLED model does not count when a next generation exists.

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Launch price (US)iThe maker's US launch MSRP for the stated configuration, excluding tax. Current store prices and later discounts do not qualify.

$2,499.991Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026US page shows 2,499.99 USD, no tax included. This matches the launch price in July 2025 trade coverage. See the CEPro source.6Press articlecepro.com/news/xio-soundbar-from-kef-complements-modern-smart-home-living/619921Read 15 October 2026Article quotes KEF: available for a retail price point of 2,499.99 USD. US price, tax not stated.

$9998Maker spec sheet (PDF)assets.sonos.com/media-kits/hardware/sonos-arc-ultra/sonos-arc-ultrafactsheet.pdfRead 8 October 2026Official launch fact sheet USD price for the standalone bar, excluding US sales tax. Later shop prices are not launch prices.

Launch price (EU)iThe maker's euro launch price for the stated configuration, including VAT as published. Current store prices and later discounts do not qualify.

€2,2993Maker product pageeu.kef.com/products/xio-soundbarRead 15 October 2026EU and German stores show 2,299 EUR including VAT. The launch price is confirmed by the hifi.de test source below.7Reviewhifi.de/test/kef-xio-test-236581Read 15 October 2026hifi.de test of 9 July 2025 gives the manufacturer's recommended price of 2,299 EUR. Germany, VAT included.

€9998Maker spec sheet (PDF)assets.sonos.com/media-kits/hardware/sonos-arc-ultra/sonos-arc-ultrafactsheet.pdfRead 8 October 2026Official launch fact sheet euro retail launch price as published for the standalone bar, including VAT.

MarketsiISO country or region codes where this exact model or variant is sold. A source page's language does not establish availability.

US, GB, EU1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026US, UK and EU KEF stores sell the XIO. Other regions may exist and are not stored.2Maker product pageuk.kef.com/products/xio-soundbarRead 15 October 2026UK store, price 1,999 GBP. No GBP price field exists in the schema.3Maker product pageeu.kef.com/products/xio-soundbarRead 15 October 2026EU store, priced in euro. The German store shows the same models and price.

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ColoursiThe maker's own colour names

Silver Grey, Slate Black1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026US and UK stores name the colours Silver Grey and Slate Black. The EU store adds (EU) to each name.2Maker product pageuk.kef.com/products/xio-soundbarRead 15 October 2026UK store names the colours Silver Grey and Slate Black.3Maker product pageeu.kef.com/products/xio-soundbarRead 15 October 2026EU store names the colours Silver Grey (EU) and Slate Black (EU).

Black, White1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026The black and white standalone bar have the same acoustic hardware.

Links

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Product page

us.kef.com/products/xio-soundbar1Maker product pageus.kef.com/products/xio-soundbarRead 15 October 2026KEF US product page. The spec table, features and variants below were read from this page and the same table on the KEF UK and EU pages.

www.sonos.com/en-us/shop/arc-ultra1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026

Spec sheet

images.salsify.com/image/upload/s--BaxUJ50x--/490b1abdf40cac67829ed9c59a357e1827c56377.pdf5Maker spec sheet (PDF)images.salsify.com/image/upload/s--BaxUJ50x--/490b1abdf40cac67829ed9c59a357e1827c56377.pdfRead 15 October 2026KEF XIO soundbar brochure with the specification table. Linked from the KEF product page.

assets.sonos.com/media-kits/hardware/sonos-arc-ultra/sonos-arc-ultrafactsheet.pdf8Maker spec sheet (PDF)assets.sonos.com/media-kits/hardware/sonos-arc-ultra/sonos-arc-ultrafactsheet.pdfRead 8 October 2026

Manual

images.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdf4Owner's manualimages.salsify.com/image/upload/s--yy9XvVWq--/aac3398ff8d2a938345e79dd74360807b5aeffa0.pdfRead 15 October 2026XIO user manual, 2025 V10, English. KEF links it from the product page.

www.sonos.com/en-us/guides/arcultra1Maker product pagesonos.com/en-us/shop/arc-ultraRead 8 October 2026

EPREL registration numberiId in the EU energy label database. Each size or model of a series has its own id, so it is per variant.

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Warranty

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Manufacturer warranty (source market)iThe maker's warranty period for the exact SKU or configuration and market named in the source note. It applies only to that stated market, not every regional variant. Statutory consumer rights are excluded. The base term is stored. An extension that needs registration goes in the source note.

Not available

1year7Maker product pagesonos.com/en-us/legal/terms-of-useRead 8 October 2026US new product manufacturer warranty, section 10(a). One year from original purchase. Excludes statutory rights and extended protection.

Both are also in the API. Back to all soundbars.