Representative image (stock photo); not the exact product.
Full Width Means Real Drivers
The single biggest constraint on soundbar performance is cabinet volume, and a full-width bar sized for a large television has several times the internal space of a compact one.
That allows more drivers, larger drivers and genuine separation between left, centre and right channels, which produces a stereo image wide enough to match a large screen rather than a narrow band of sound in the middle.
It also allows dedicated up-firing drivers rather than processed height, which is the meaningful distinction between bars that support Atmos and bars that reproduce it.
Bass Without A Subwoofer
The Arc Ultra uses a different low-frequency transducer approach that achieves considerably more bass output from the same cabinet volume than a conventional driver would.
The practical consequence is a bar that genuinely does not require a subwoofer for most content, which matters because a subwoofer is an additional large box and an additional placement problem.
It is still not a subwoofer. For action films and games at volume, adding one produces a step change, and the bar is designed to accept one when you want it.
Height Effect And The Ceiling
The up-firing drivers reflect sound off the ceiling, and the effect is genuinely convincing in a room with a flat, reflective ceiling at normal height.
In a room with a sloped, vaulted, beamed or heavily absorbent ceiling, the effect is substantially reduced. This is a property of the room rather than the hardware and no processing compensates for a ceiling that scatters the reflection.
Anyone with an unusual ceiling should weigh that before paying the premium for physical up-firing drivers, since the advantage over a processed bar narrows considerably in those rooms.
Ecosystem, Setup And Expansion
It requires the Sonos app and an account, and its multi-room capability and expansion into a surround system with rears and a subwoofer only exist within that platform.
Room calibration using a phone microphone is included and worth running. The measurement is less precise than a dedicated microphone and it is considerably better than no calibration, particularly for the up-firing channels.
Sonos has had well-publicised problems with app releases affecting existing customers, and while that is not a hardware issue it is a legitimate consideration when buying into a platform-dependent product.
Against The Alternatives
Against the smaller Beam, the Arc Ultra adds real channel separation, dedicated up-firing drivers and enough bass to skip a subwoofer, at a considerably higher price and a much larger cabinet. In a room with a large television the width is appropriate rather than excessive.
Against a complete package like Samsung's with included rears, this is one box and produces no genuine surround from behind you until rears are added separately. Which matters more, tidiness now or surround now, is a real decision rather than a specification comparison.
Against a conventional receiver and separate speakers, a traditional system still sounds better for the money and requires speaker cable, a receiver and the knowledge to set it up. This trades some performance for a single tidy object and an app.
The Verdict
A genuinely premium soundbar: full-width drivers with real separation, dedicated up-firing height, and unusually deep bass that means a subwoofer is optional rather than necessary.
It is large, expensive, ecosystem-dependent, and its height effect is a property of your ceiling as much as the hardware.
Look at your ceiling before paying for physical up-firing drivers — in a vaulted or absorbent room, much of what you are paying extra for does not reach you.
At a glance
Pros
- Full-width cabinet allows real left, centre and right separation
- Dedicated up-firing drivers rather than processed height
- Unusually deep bass; a subwoofer is optional for most content
- Room calibration included and worth running
Cons
- Large and expensive
- Height effect depends heavily on ceiling shape and material
- Requires the app, an account and the Sonos platform
- Platform has had publicised app problems affecting owners
Frequently asked questions
Do I need a subwoofer with it?
For most content, no — the low-frequency design achieves considerably more output than a conventional driver in the same cabinet. For action films and games at volume, adding one is a step change, and the bar accepts one when you want it.
Will the height effect work in my room?
It reflects off the ceiling, so a flat reflective ceiling at normal height works well and a sloped, vaulted, beamed or absorbent one substantially reduces it. In those rooms much of the premium over a processed bar does not reach you.
Is the platform dependency a risk?
It is a legitimate consideration. Multi-room and expansion only work within Sonos, the app and an account are required, and the company has had publicised app releases that disrupted existing owners. That is not a hardware fault and it is part of what you are buying into.
Specifications
| Type | Full-width premium soundbar |
| Channels | Real left, centre, right separation |
| Atmos | Dedicated up-firing drivers |
| Bass | Deep; subwoofer optional |
| Calibration | Phone microphone based |
| Expansion | Rears and subwoofer within Sonos |
| App | Required |
| Ceiling dependency | Significant |
The bottom line
Real driver separation, genuine up-firing height and bass deep enough to skip a subwoofer. Large, expensive, platform-bound — and check your ceiling first.
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