Sonos has expanded its home‑audio ecosystem with a feature that lets its portable Play speakers double as rear‑surround channels for the Beam Ultra soundbar. Powered by the Sonos27 operating system, the setup automatically detects when a Play speaker is moved out of its designated surround position and reverts it to independent playback, then restores it to the surround array when returned.
How the automatic surround system works
The technology relies on an accelerometer inside each Play speaker to sense when the unit is lifted. At the same time, Sonos Positioning Technology emits near‑ultrasonic signals that are captured by microphones in the soundbar. These signals allow the system to determine whether the speakers remain in the same room and to identify their relative placement, automatically assigning left‑right rear roles without user intervention.
In theory, the process should be seamless: a speaker removed from the bedroom should drop out of the home‑theater group, appear as a standalone AirPlay device, and then re‑join the surround configuration when placed back on its original stand. The author of the source article put this claim to the test.
Real‑world testing and performance
During the first trial, moving a Play speaker from the bedroom to the living room did not trigger the expected disconnection; the speaker continued to output the home‑theater mix and exhibited intermittent audio drop‑outs. The author resorted to manually selecting “Stop Using Surrounds” in the Sonos app, which forced the speaker into independent mode. Returning the speaker to its original spot required another manual step—choosing “Start Using Surrounds”—to re‑establish the surround link.
A second attempt produced the intended behavior. After relocating the Play speaker, a brief pause was followed by an audible tone confirming the speaker’s exit from the surround group. Both Play units then appeared as standalone speakers in the AirPlay list. When the speaker was placed back, a white breathing light signaled position detection, and a second tone confirmed reconnection as the rear‑left surround channel, all without further app interaction.
With the automatic switching functioning, the author evaluated the audio quality using the high‑intensity Penguin car chase sequence from “The Batman.” The Beam Ultra alone delivered a surprisingly full soundstage for its compact size, with deep‑weight bass that made a separate subwoofer feel unnecessary in a bedroom setting. Adding the two Play speakers as surrounds enriched the rear‑channel effects, allowing passing vehicle noises and car horns to be heard from behind the listener.
Increasing the surround and height audio settings to +5 amplified the immersion further, making chaotic on‑screen action, such as a rolling car, feel more realistic. The author noted that the system could track the direction of sounds, reinforcing the sense of being seated within the scene.
Comparison with the larger Arc system
To gauge the Beam Ultra‑Play combination against Sonos’ previous flagship, the author re‑installed an Arc soundbar with two Sonos One speakers in the same bedroom. The Arc’s larger chassis and greater driver count produced noticeably higher overall volume and stronger low‑frequency impact, especially when the surround TV level was raised to +5. Engine roars and highway ambience carried more bass weight than the Beam Ultra setup.
However, the Beam Ultra excelled in clarity of dialogue and high‑frequency detail. Voices were more distinct, and sharp effects such as screeching tires exhibited greater definition. The author also highlighted the ease of adding portable surrounds with the Plays: selecting “Use Surrounds” automatically positioned the speakers left and right, whereas the Ones required manual channel assignment.
Both configurations delivered satisfying cinematic surround experiences. The Arc‑based system offered a larger sound envelope and deeper bass, while the Beam Ultra paired with Play speakers proved that a smaller, more flexible arrangement can still provide a convincing theater‑like performance.
Pricing reflects the trade‑off. The Beam Ultra with two Play speakers costs $1,297 (or £1,297 / AU$2,097), whereas Sonos’ own Beam Ultra plus Era 100 surround bundle is priced lower at $1,112 (or £1,097 / AU$1,705). By contrast, a traditional Arc and two One speakers represent a higher entry cost but deliver greater raw output.
Ultimately, the innovation lies not in raw power but in the convenience of a movable surround system. Users can relocate Play speakers to other rooms for music playback, then return them to automatically resume rear‑surround duties, eliminating the need for manual reconfiguration. This flexibility may appeal to listeners who value both high‑quality home‑theater sound and the ability to repurpose speakers throughout a living space.
While the author’s initial experience highlighted a hiccup in the automatic detection, subsequent testing confirmed that the feature works as intended, offering a novel approach to modular home‑theater design. The combination of accelerometer‑driven motion sensing and ultrasonic positioning demonstrates Sonos’ commitment to integrating hardware and software for a more adaptable audio environment.
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