Between the Xtreme 4 and Stockwell III, the Xtreme 4 comes out ahead in output power and water resistance, while the Stockwell III wins on battery and low-end response. Overall, the Xtreme 4 scores 73.9 and the Stockwell III scores 65.3 on our Mars Score.
Which should you buy?
The Xtreme 4 is the clear pick on raw spec strength, leading by 8.6 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 Xtreme 4 if you care most about output power and water resistance. The biggest gaps in its favor are output power, water resistance.
Pick the Stockwell III if you care most about battery and low-end response. Its strongest claims are battery, low-end response.
Both ship with comparable stereo pairing, so those specs don't separate the two — focus on the differences below.
Bottom line: the Xtreme 4 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why JBL - Xtreme 4 wins
- ▲Output power — 233.33% more. 100 W vs 30 W.
- ▲Water resistance: IP67 (vs IPX4).
Why Marshall - Stockwell III wins
- ▲Battery — 12.50% more. 27 h vs 24 h.
- ▲Low-end response — 3.00 Hz less. 50 vs 53.
Spec comparison
Audio
| Spec | JBL - Xtreme 4 | Marshall - Stockwell III |
|---|---|---|
| Output power | 100 Wlead | 30 W |
| Low-end response | 53 Hz | 50 Hzlead |
| Stereo pairing | true | true |
Durability
| Spec | JBL - Xtreme 4 | Marshall - Stockwell III |
|---|---|---|
| Water resistanceⓘ | IP67lead | IPX4 |
| Weight | 2150 g | 1390 glead |
Battery
| Spec | JBL - Xtreme 4 | Marshall - Stockwell III |
|---|---|---|
| Battery | 24 h | 27 hlead |
| USB out (powerbank) | truelead | false |
Spec-level deep dives
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