Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Marshall - Stockwell III | Sonos - Roam 2 |
|---|---|---|
| Battery | 27 h | 10 h |
| Low-end response | 50 Hz | 60 Hz |
| Water resistance | IPX4 | IP67 |
Between the Stockwell III and Roam 2, the Stockwell III comes out ahead in battery / low-end response, while the Roam 2 wins on water resistance. Overall, the Stockwell III scores 61.4 and the Roam 2 scores 60.7 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (61.4 vs 60.7). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the Stockwell III if you care most about battery / low-end response. The biggest gaps in its favor are battery, low-end response. The single most decisive one: Battery — 170.00% more. 27 h vs 10 h.
Pick the Roam 2 if you care most about water resistance. Its strongest claims are water resistance. The single most decisive one: Water resistance: IP67 (vs IPX4).
Both ship with comparable output power, stereo pairing, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Marshall - Stockwell III or Sonos - Roam 2?
Marshall - Stockwell III leads the current Mars Score by 0.7 points.The more useful decision is the trade-off behind that result: compare battery, water resistance against the way you will actually use the product.
Choose Marshall - Stockwell III if…
Marshall - Stockwell III has the measurable edge on battery h, frequency low hz.
Choose Sonos - Roam 2 if…
Sonos - Roam 2 has the measurable edge on ip rating.
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 Marshall - Stockwell III wins
- ▲Battery — 170.00% more. 27 h vs 10 h.
- ▲Low-end response — 10.00 Hz less. 50 vs 60.
Why Sonos - Roam 2 wins
- ▲Water resistance: IP67 (vs IPX4).
Spec comparison
Audio
| Spec | Marshall - Stockwell III | Sonos - Roam 2 |
|---|---|---|
| Output power | 30 W | 30 W |
| Low-end response | 50 Hzlead | 60 Hz |
| Stereo pairingⓘ | true | true |
Durability
| Spec | Marshall - Stockwell III | Sonos - Roam 2 |
|---|---|---|
| Water resistanceⓘ | IPX4 | IP67lead |
| Weight | 1390 g | 430 glead |
Battery
| Spec | Marshall - Stockwell III | Sonos - Roam 2 |
|---|---|---|
| Battery | 27 hlead | 10 h |
| USB out (powerbank) | false | false |