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ULTIMEA Poseidon M40 Dolby Atmos 2.1 soundbar with wireless subwoofer review

A 2.1 set with a wireless subwoofer at the accessible end, whose Atmos badge means decoding — as it does on every bar here without a third channel number.

The bottom line The cheapest two-box set here — the subwoofer is the reason to buy it, and the Atmos badge is decoding rather than height.

What separates it from a one-box bar

The subwoofer, in its own cabinet, wireless. That is the upgrade: a slim bar has no volume behind its drivers, and a separate box does. It also means the low end can be positioned, which changes what arrives at the sofa more than the specification does.

The Atmos question, once more

2.1 and no third number. The bar decodes Dolby Atmos and renders it across two channels and a subwoofer. Nothing is aimed at the ceiling. That is true of every bar in this family except the Samsung, and each of these pages says so rather than letting the badge imply otherwise.

What is missing

A centre channel, and a power figure with conditions. The first matters for dialogue; the second means the bar cannot be compared on power with anything.

Placing the subwoofer

Try three positions and listen to the same passage in each: a corner, the front wall, and beside the seating. Room modes decide what arrives at your ears, and a metre of movement changes more than a price tier would.

Where it sits

The entry point for two-box sound. Above it, the same money buys a 3.1 bar with a centre channel — and which matters more depends on whether the complaint is dialogue or depth.

Availability

On sale from 110 € to 160 € on the German, French, Italian and Spanish Amazon stores at the time of checking.

Listed but with no offer on the British Amazon store — the reference exists there and nobody is currently selling it.

Not found on the American Amazon store, where the buy link falls back to a local search rather than to a page that does not exist.

Prices and availability are what Keepa reported on the date this page was updated; both move.

Prices quoted in this text were read on 4 September 2026. The live price is at the top of the page.

What we like, and what we don't

Strengths

  • A separate wireless subwoofer at a price where most bars have the driver inside them
  • Dolby Atmos decoding, so the bitstream from a streaming service is handled rather than downmixed
  • Among the cheapest ways to get a two-box system rather than a one-box bar

Compromises

  • No height drivers, so Atmos is decoded and rendered across two channels
  • No centre channel
  • No power figure with stated conditions

Specifications

Channels2.1 — stated; no height channels
SubwooferWireless, separate — stated
FormatsDolby Atmos decoding — stated
PowerNot stated with conditions in this listing
Amazon referenceB0GL177V7T (same reference on 5 Amazon marketplaces)
EAN4262533461468

Questions people actually ask

What does the subwoofer actually add?

Two things. Depth, obviously — and more usefully, relief: taking low frequencies away from the bar's small drivers lets them reproduce everything else more cleanly, which is heard as clarity at volume rather than as bass.

Is Atmos decoding worth anything without height speakers?

Yes, modestly. The decoder receives the object-based mix and renders it across the channels present, which generally sounds better than receiving a downmixed stereo signal. What it cannot do is place a sound above you.