The Sonos Arc Ultra is the top soundbar in the Sonos home theatre lineup and the successor to the original Arc. The headline change is Sound Motion, a four-motor, dual-membrane woofer that squeezes far more low end into the bar, which in turn leaves room inside for extra tweeters and midwoofers. Sonos now rates it for 9.1.4 spatial audio, adds Bluetooth for direct phone streaming and moves to Wi-Fi 6, while keeping the slim, wall-friendly shape.

Sonos Arc Ultra key specs

Audio format	Dolby Atmos, rated 9.1.4 spatial audio
Woofer	Sound Motion four-motor, dual-membrane woofer
Amplification	15 Class-D amplifiers
Height effects	Two upward-firing tweeters
TV connection	HDMI eARC (1.5 m cable included)
Wireless	Wi-Fi 6, Bluetooth 5.3, Apple AirPlay 2
Voice	Sonos Voice Control and Amazon Alexa, physical mic switch
Room tuning	Trueplay via the Sonos app on iOS and Android
Dimensions	75 x 1,178 x 110.6 mm
Weight	5.9 kg

Who the Sonos Arc Ultra is for

It makes most sense for owners of a mid-size or large TV who want cinema-style height effects without running wires for rear speakers on day one. Because it plugs into the Sonos ecosystem, it also works as a whole-home music speaker and can later be paired with a Sonos Sub or a pair of surrounds. People with a TV that lacks HDMI eARC will miss lossless formats such as Dolby TrueHD, so check the TV first.

What to check before buying a new Sonos Arc Ultra on eBay

Confirm the listing is the Arc Ultra and not the original Arc; the two look similar from the front, so compare the model name on the box label.
Ask for a factory-sealed box; Sonos products are tied to a Sonos account, and an opened unit may still be registered to someone else.
Make sure the HDMI cable and power cord are included, and that the unit ships with a North American plug.
Check the seller’s return window carefully, since a soundbar this size is costly to ship back.
Prefer authorised retailers or established sellers so the manufacturer warranty can be claimed; our eBay safety checklist covers what to look for.

Sonos Arc Ultra FAQ

Does the Sonos Arc Ultra need a subwoofer?

No. The built-in Sound Motion woofer handles bass on its own. A Sonos Sub can be added later for more depth, but it is optional.

Can the Arc Ultra play music over Bluetooth?

Yes. Unlike the original Arc, it supports Bluetooth 5.3, so a phone can stream to it directly in addition to Wi-Fi and AirPlay 2.

Will it work with any TV?

It connects through HDMI eARC or ARC. Lossless Atmos formats such as Dolby TrueHD need a TV with eARC; with plain ARC, compressed Dolby Atmos is still supported where the TV passes it through.

How buying works

Tapping the button takes you to live eBay listings for a new Arc Ultra. Checkout runs through eBay, and the seller packs and ships the soundbar to you. If it never shows up or turns out different from the listing, the eBay Money Back Guarantee steps in. Before you pay, read the final price, delivery charges and return terms shown on eBay.

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