Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Sonos - Arc Ultra | Yamaha - YAS-209 |
|---|---|---|
| Dolby Atmos | true | false |
| eARC | true | false |
| Subwoofer included | false | true |
| Total power | 0 W | 200 W |
Between the Arc Ultra and YAS-209, the Arc Ultra comes out ahead in dolby atmos / earc, while the YAS-209 wins on subwoofer included / total power. Overall, the Arc Ultra scores 68.3 and the YAS-209 scores 40.2 on our Mars Score.
Which should you buy?
The Arc Ultra is the clear pick on raw spec strength, leading by 28.1 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the Arc Ultra if you care most about dolby atmos / earc. The biggest gaps in its favor are dolby atmos, earc. The single most decisive one: Has Dolby Atmos.
Pick the YAS-209 if you care most about subwoofer included / total power. Its strongest claims are subwoofer included, total power. The single most decisive one: Has Subwoofer included.
There are no meaningful ties on the headline specs — every popular-comparison metric has a winner.
Bottom line: the Arc Ultra is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: Sonos - Arc Ultra or Yamaha - YAS-209?
Sonos - Arc Ultra leads the current Mars Score by 28.1 points.The more useful decision is the trade-off behind that result: compare total power, dolby atmos, subwoofer included against the way you will actually use the product.
Choose Sonos - Arc Ultra if…
Sonos - Arc Ultra has the measurable edge on has dolby atmos, has earc.
Choose Yamaha - YAS-209 if…
Yamaha - YAS-209 has the measurable edge on subwoofer included, total w.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Sonos - Arc Ultra wins
- ▲Has Dolby Atmos.
- ▲Has eARC.
Why Yamaha - YAS-209 wins
- ▲Has Subwoofer included.
- ▲Total power: 200 W vs 0 W.
Spec comparison
Audio
| Spec | Sonos - Arc Ultra | Yamaha - YAS-209 |
|---|---|---|
| Channels | 9.1.4 | 2.1 |
| Total power | 0 W | 200 Wlead |
| Dolby Atmosⓘ | truelead | false |
| DTS:X | false | false |
Connectivity
| Spec | Sonos - Arc Ultra | Yamaha - YAS-209 |
|---|---|---|
| HDMI inputs | 1 | 1 |
| eARCⓘ | truelead | false |
| Subwoofer included | false | truelead |