Sonos Arc Ultra + Sonos Sub 4 review: A blend of power and elegance

Sonos Arc Ultra

If you’ve ever dreamed of turning your living room into a mini theatre without cluttering it with speakers and wires, Sonos’ latest combo – the Arc Ultra soundbar and Sub 4 wireless subwoofer – promises to do just that.  Sonos has long been the brand for people who don’t want to choose between sound quality and clean design, and this new flagship setup proves that balance can still be beautiful — and loud. Very loud.

Sonos Arc Ultra + Sonos Sub 4 review: Design

At first glance, the Arc Ultra looks like a soundbar that belongs in a design museum rather than under a television. It stretches across at 1.18 metres wide — perfect for TVs 55 inches and up — and comes in classic black or white finishes. The design language is unmistakably Sonos: minimalist, curved edges, no sharp corners, no plastic flashiness. The perforated metal grille wraps neatly around the front and top, giving it a seamless, monolithic look.

What’s interesting is how understated it feels. There’s no big logo, no blinking display — just a small LED above the Sonos logo that changes colour depending on what the system is doing. It’s the kind of design that fades into the room when the lights dim and the movie begins.

The Sonos Sub 4, meanwhile, is a clever reinvention of what a subwoofer should look like. Gone is the boring black cube; instead, Sonos has opted for rounded corners and a striking oval cut-out in the middle. That hole isn’t just aesthetic — it’s the air outlet for the two woofers positioned opposite each other. It even doubles as a handle, making it easy to move around (which you’ll do, since subwoofer placement changes the sound quite a bit).

Setup and controls: App's the way to go

As usual, Sonos insists on doing everything through its Sonos app. There’s no physical remote, which might irritate traditionalists but also keeps the setup elegant. The process is simple enough: create or sign into a Sonos account, pair the devices, install updates, and you’re ready.

Once you’re in, the app handles almost everything — volume control, EQ settings, streaming service integration, and even firmware updates. It also includes Trueplay, Sonos’ room calibration feature, which uses your phone’s mic (and the Arc Ultra’s built-in mics) to tune the sound based on your room acoustics.

Three touch-sensitive buttons on the soundbar’s top handle play/pause, track skipping, and volume. Voice assistants — Amazon Alexa or Sonos Voice Control — can also take over if you prefer shouting at your speakers instead of tapping them.

Sonos Arc Ultra + Sonos Sub 4 review: What's under the hood 

Inside the Sonos Arc Ultra is some serious engineering. The soundbar houses 15 Class-D digital amplifiers, each driving its own speaker unit. There are seven silk dome tweeters (two firing upwards for Dolby Atmos height effects) and six midrange drivers, plus a pair of oval woofers that handle the low end when used standalone.

The Sub 4 adds two 12×20 cm oval woofers that work against each other internally, reducing vibration while pushing out deep, tight bass. Sonos doesn’t disclose wattage numbers — a typically American move also seen from Bose — but the performance tells the story.

Audio Performance: Clean, confident, and cinematic

Let’s start with the basics: dialogue clarity. The Arc Ultra handles voices exceptionally well. In movies like Oppenheimer, even during chaotic moments, Cillian Murphy’s lines cut through cleanly without the over-processed sharpness you often get from lesser soundbars. Vocals sound natural, never boxy or muffled.

Switch to music, and the Arc Ultra holds its own as a stereo speaker system. From AR Rahman’s layered arrangements to the clean percussion on Billie Jean, the soundbar delivers a balanced, spacious presentation. Instruments have room to breathe, and at higher volumes, the soundstage widens beautifully without distortion.

The Dolby Atmos effect is decent — immersive, though not mind-blowing. You’ll hear height and depth cues clearly, but if you expect jets to fly literally over your head, you’ll need to add surround speakers like the Sonos Era 300. Still, for a single soundbar, the sense of width and directionality is impressive.

Bass: The Sub 4 makes all the difference

On its own, the Arc Ultra already produces satisfyingly deep bass for casual movie nights or streaming music. But once you pair it with the Sub 4, the system transforms. Explosions feel fuller, bass guitars sound taut, and the overall presentation gains depth and precision.

The Sub 4’s dual woofers are tuned for accuracy, not sheer volume, and you can tell. Instead of a boomy thud, you get tight, controlled low-end energy that complements the Arc Ultra’s clean mids and highs. The only caveat: depending on placement, the default phase setting can cause slight bass cancellation near 80 Hz. Trueplay can auto-correct it, but manually flipping the phase in the app often yields a cleaner result.

In the Indian context, where living rooms often double up as home theatres, the Arc Ultra fits right in. Its 3D spatial imaging fills the room without needing extra speakers. It handles Bollywood soundtracks, YouTube concerts, and OTT action flicks with equal finesse.

That said, Trueplay tuning is crucial — especially in tiled or echo-prone Indian apartments. Once calibrated, the Arc Ultra smooths out the harshness and gives you a balanced, cinematic experience without rattling the windows.

Should you buy it? 

This is Sonos flexing its engineering muscle, showing it can go toe-to-toe with Bose, Samsung, and Sony while looking relatively better doing it.

Of course, all this comes at a price. The Sonos Arc Ultra is priced at Rs 99,999 whereas the Sub 4 will cost you another Rs 84,999.  But you’re paying for an experience — one that combines beautiful industrial design, an intelligent app ecosystem, and room-filling, emotionally rich sound. It’s not about loudness; it’s about presence. And in that sense, the Arc Ultra + Sub 4 combo doesn’t just play sound — it performs it.