Sonos Ace Ultra Locks Headphone Link Behind New Radios

Sonos priced the Ace Ultra at $449 for a WiFi music hand-off the original Ace, now $349, cannot run. The new pair is on preorder and due to ship on September 29, with Headphone Linking still in Early Access.

The gap is not a software toggle. Sonos staff say Headphone Engine 2, the radios and firmware that move music between a speaker and the cups, is new hardware that only Ace Ultra has.

Headphone Engine 2 Stays Off the Original Ace

When the first Ace arrived in June 2024, it could steal TV sound from a Sonos soundbar. It could not sit in the music system the way a speaker does. Owners asked for that missing hop for two years. The company built it into new silicon instead of a patch.

CEO Tom Conrad, announcing the product on September 1, 2026, called Ace Ultra the first headphone built on Headphone Engine 2. One press pushes whatever is playing on a supported speaker into the cups. Another press sends it back, with no phone in range. Beam Ultra, the compact soundbar launched the same day, is $699.

Andrew K, posting as Sonos staff, was blunt: Headphone Engine 2 is exclusive to Ace Ultra. Setup still uses a Bluetooth Low Energy link to the phone, and that radio only holds one active headphone session. You can add several Ultra pairs to a household. Only one can take the music stream at a time.

The cups are not a full Sonos speaker. A supported box in the house does the heavy lifting, encoding a stream and sending it over WiFi. That is why a dead zone in the hallway can drop the song, and why the feature will not follow you out of the house.

This is just the beginning for headphone linking. Our priority for this Early Access release was nailing the fundamentals: clean, reliable, high-quality audio streaming with Ace Ultra as part of the system. We built a dedicated WiFi connection for this exact purpose and put it through extensive listening evaluations to make sure it meets the standard people expect from Sonos.

Cameron MacLeod, audio systems lead, Wearables and Headphones, Sonos Community

MacLeod’s “beginning” line matters because the stream is not the company’s best audio. Staff say a link session uses a high-quality compressed stereo feed. Lossless and Spatial Audio are not on that path yet.

What Headphone Linking Can and Cannot Do

Hold the Content Key on the right cup until the swap tone plays, then let go. Sound jumps from the nearest supported speaker into the headphones. Hold it again within about an arm’s length of a speaker and the song jumps back, not always to the same box you left. The short range is deliberate, so a pocket press does not blast a nursery. Chris Davies, testing the pair, timed the hop at about 3 to 4 seconds.

Playback has to start in the Sonos app or with Sonos Voice Control. Line-in and the local music library also work. If the speaker is taking AirPlay, Bluetooth, or a service’s own remote, the cups will not pull the track. Alexa and Google Assistant will not hand off either. MCP, the new AI control layer in Sonos 27, cannot see or start playback on Ace Ultra yet.

Supported boxes include Amp, Arc, Arc SL, Arc Ultra, Beam (Gen 1 and Gen 2), Beam Ultra, Era 100, Era 100 SL, Era 100 Pro, Era 300, Five, Play, Ray, Roam, Roam SL, Roam 2, Move, and Move 2. Several of those, marked by staff with an asterisk, cannot act as the proxy if they are already serving as rear surrounds. Households that park a turntable on an older Play:5, or a Port feeding an Arc Ultra, are already arguing over workarounds, because those source boxes are not on the list.

EARLY ACCESS LIMITS ON THE WIFI HOP

• One pair playing: Several Ultra sets can join a system, but only one can hold the music stream.
• No grouping: Linking moves audio rather than copying it, and a group that was playing will disband and stop.
• Compressed stereo: The hop is not lossless and does not carry Spatial Audio in this build.
• WiFi only: Weak coverage indoors can interrupt playback, and the trick does not work on the go.
• App-started sources: AirPlay, Bluetooth into a speaker, and most voice stacks other than Sonos Voice Control will not transfer.
• Headphones win conflicts: If the cups are already playing something else, that stream overrules the speaker unless you pause first.

TV Audio Swap, the older soundbar trick, still allows two Ace or Ace Ultra pairs at once. Linking does not. There is no silent disco where a room of headphones shares one mix. For most evenings that is a small loss. It is a sharp reminder that the $449 pair is still a satellite of the speaker that encodes the stream.

Jen McDevitt, a principal product manager on Ace Ultra, described the intended scene as a busy house where one person needs quiet. That is the honest use: pull a record off the Five so someone else can have the room, then push it back when they leave.

The $100 Buys a Narrower Sound Gap

Sonos still sells the original Ace. On the Ace Ultra comparison it is listed at $349, which is $100 less than the new pair and $100 less than the Ace’s own $449 launch price in June 2024. Seen only as wireless cans, that extra hundred dollars is a hard sell.

Both models use a 40 mm driver in each cup. Ultra gets a new motor with an extra outer ring magnet, plus Adaptive EQ that reads fit from the ten-mic array. Default tuning is still the warm, even Sonos voicing. Davies, listening to both, heard a little more space between singers and instruments on Ultra, and tighter low notes at high volume. He also called the gap narrow, and a useful reminder that the first Ace already sounded pleasant.

The app now offers a 3-band EQ (bass, mid, treble) and an 8-band mode that reaches from 46 Hz to 10 kHz, with optional Loudness and, in advanced mode, gain. The original Ace had two bands. Dynamic EQ tries to correct leaks from glasses or hair. Tinkerers will notice. Casual listeners may not.

ACE AND ACE ULTRA, SIDE BY SIDE

Lossless remains available over Bluetooth with a supported device, or over the bundled USB-C cable. Multipoint Bluetooth and wear detection carry over. The Ultra pair is not waterproof, does not fold, and still ships with USB-C to USB-C and USB-C to 3.5 mm leads in a zippered case that is bulky for a small pack.

Ten Mics and a Better Seal for Glasses

Sonos says Adaptive ANC on Ace Ultra is up to twice as strong as on Ace, with ten microphones instead of eight. Davies ran cabin drone, café chatter, road noise, and a walking-desk treadmill through both pairs. Engine roar was about even. Chatter and street sound dropped a little more on Ultra. The treadmill hum improved a bit. Nothing here knocks Sony, Bose, or Sennheiser off a shortlist if silence is the only goal.

The bigger change is the cushion. Original Ace leaked more when glasses arms broke the seal. Ultra’s inner edge is reshaped, so the cup sits a little tighter on the same frames. Aware Mode, which pipes the room back in, also sounds less metallic. Voice Boost, new on Ultra, lifts speech in that mode. Sidetone lets you hear your own voice on calls with ANC on.

Official weight is 0.71 lbs, or 322 g, about 10 g more than Ace. Davies did not feel the extra mass on long sessions, and he had already worn Ace on international flights without hot spots. Metal arms and memory foam remain. Buttons are slightly larger. The power control and USB port have moved. New mic grilles are bigger and more numerous. Magnetic cushions still pop off, but Ace pads will not click onto Ultra cups, so a spare set from 2024 is a paperweight.

Battery life is up to 35 hours with ANC on, five hours more than Ace. A three-minute charge adds up to three hours of playback, and a full charge from empty can take up to three hours. A new power saver mode claims to double whatever time is left by shutting features off. The 1,060 mAh cell is meant to be swapped by a skilled operator, which matches the company’s pitch that the cups should outlast a sealed rival.

Sonos says Ultra uses 46% recycled and renewable materials, more than Ace, and the new case is about 80% recycled content. Agave, a blue-green, and Sand join Black and Soft White when you buy from Sonos and some retailers. A Sanus stand is $49.99. A 45W USB-C brick is $29.

Two Years After the App Broke, Sonos 27 Shows Up

Ace Ultra lands with Sonos 27, the company’s name for the next audio operating system and a redesigned app. The 2024 app overhaul stripped features, broke playback, and left owners so angry that hardware slipped while the company patched. Patrick Spence left the chief executive job. Tom Conrad, a board member who had been at Pandora and Snap, took over, first as interim, then in the permanent seat.

Conrad now talks about an audio operating system rather than a stack of speakers. Headphone Linking is one of the first new tricks on that platform. What follows, and when, has not been spelled out. The caution is visible in the rollout. Improved navigation went out as an opt-in toggle before it became the default.

FROM THE APP CRISIS TO ACE ULTRA

1. 2024: A redesigned Sonos app ships missing controls and unreliable playback, and the backlash lasts for months.
2. June 2024: Original Ace launches at $449 with TV Audio Swap, still a Bluetooth headphone outside that one soundbar hop.
3. July 2026: Tab navigation, speaker sorting, and a clearer iOS volume control begin rolling out as an opt-in fix.
4. September 1, 2026: Sonos unveils Ace Ultra, Beam Ultra, and Sonos 27, with headphone linking marked Early Access.
5. September 8, 2026: New Home, System, and Search navigation starts reaching the app, after lock-screen controls had already begun returning in August.
6. September 29, 2026: Ace Ultra is due in homes, and linking goes live as an opt-in, as-is feature that can still change.

Davies found the new app calmer than the version that made him stop playing music some nights. System health views and presets are still due later in the fall. Sonos 27voice and third-party agents sit in their own Early Access track. The company says it is trusted by more than 17 million households. Those homes remember the last time a big software day went wrong, which is why linking is gated, optional, and wrapped in caveats.

Ace Owners Keep TV Swap and Lose the Music Hand-Off

The original Ace remains on the site at $349 while Sonos takes preorders for the Ace Ultra at $449 with 35-hour battery. Mix a pair of each on a soundbar and TV Audio Swap still works for two listeners. The music hop does not come along. Cushions do not swap. The radios inside Ace were never designed for the dedicated WiFi path Ultra uses.

That split is the bill for 2024. People who bought the first headphones, at the same $449 Ultra now commands, asked for speaker linking and are told to buy a second pair. The engineering case is real: new antennas, a new radio, and thermal work that would not fit the old shell. The commercial case is just as real. The recovery is being sold as hardware.

WHAT WE KNOW

• Ship date: General availability is September 29, 2026, after preorders opened on September 1.
• The lock: Headphone Engine 2 and linking are exclusive to Ace Ultra in this release.
• The stream: Linking is compressed stereo over WiFi, one Ultra at a time, and it tears down speaker groups.

WHAT IS UNCONFIRMED

• A backport: Sonos has not said whether original Ace will ever gain linking.
• Odd networks: Clean tests have been fine; dense or messy WiFi setups are still an open risk.
• Older sources: Line-in on boxes missing from the supported list has no official yes.

Early hands-on units are already with testers ahead of the ship date, and some needed a day before the Content Key would move audio at all. Once it woke up, the hop did what the button promised. That is a better omen than 2024, and it is still a beta label on a $449 product.

Ace Ultra ships on September 29 with Headphone Linking marked Early Access, opt-in, and subject to change.