Between the S90TR and Arc Ultra, the S90TR comes out ahead in subwoofer included / total power, while the Arc Ultra wins on several specs. Overall, the S90TR scores 69.5 and the Arc Ultra scores 35 on our Mars Score.
Which should you buy?
The S90TR is the clear pick on raw spec strength, leading by 34.5 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 S90TR if you care most about subwoofer included / total power. The biggest gaps in its favor are subwoofer included, total power.
The Arc Ultra similarly does not carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
Both ship with comparable dolby atmos, earc, so those specs do not separate the two — focus on the differences below.
Bottom line: the S90TR is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why LG - S90TR wins
- ▲Has Subwoofer included.
- ▲Total power: 570 W vs 0 W.
Why Sonos - Arc Ultra wins
- No decisive advantages.
Spec comparison
Audio
| Spec | LG - S90TR | Sonos - Arc Ultra |
|---|---|---|
| Channels | 7.1.3 | 9.1.4 |
| Total power | 570 Wlead | 0 W |
| Dolby Atmosⓘ | true | true |
| DTS:X | truelead | false |
Connectivity
| Spec | LG - S90TR | Sonos - Arc Ultra |
|---|---|---|
| HDMI inputs | 2lead | 1 |
| eARCⓘ | true | true |
| Subwoofer included | truelead | false |
Spec-level deep dives
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