Short answer: the JBL Xtreme 4. It ranks #44 of 115 large speakers by sound quality, rated 3.8/5, at $309.95. The Marshall Stockwell III ranks #79, rated 3.0/5, at $249.99, $59.96 cheaper, not enough of a saving to outweigh the sound-quality gap.
The JBL Xtreme 4 is the better-sounding, tougher pick. A rugged, waterproof speaker with clear, punchy sound, a swappable battery, a power bank and excellent real world battery life. It is rated IP67 against IP55 for the Marshall Stockwell III. The tradeoff: It cannot produce the deep rumble of a larger speaker, and bass compression increases near maximum volume.
The Marshall Stockwell III is the longer-running, lighter option. A stylish, rugged speaker with a very long battery you can swap yourself, a detailed app EQ, and power bank charging. It is rated for 40 hours of battery against 24 for the JBL Xtreme 4. At 2.9 lbs (1.3 kg) it weighs much less than the JBL Xtreme 4 at 4.6 lbs (2.1 kg). It supports AAC Bluetooth, which the JBL Xtreme 4 lacks. Watch for: Highs are recessed by default and need the treble control maxed to compensate, still lacking detail even then.
Buy the JBL Xtreme 4. It is rated higher for sound quality, and saving $59.96 with the Marshall Stockwell III does not make up for the sound-quality gap.
Looking for alternatives? See the complete Portable Bluetooth rankings.
A rugged, waterproof speaker with clear, punchy sound, a swappable battery, a power bank and excellent real world battery life.
A stylish, rugged speaker with a very long battery you can swap yourself, a detailed app EQ, and power bank charging.
Prices on this page were last checked October 31, 2026 at 7:11 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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Specifications Side By Side
| JBL Xtreme 4 | Marshall Stockwell III | |
|---|---|---|
| Price | $309.95 | $249.99 |
| Ranked | #44 of 115 in Large Size Portable Bluetooth Speakers | #79 of 115 in Large Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | Yes |
| Battery Life | 24 hours (Manufacturer specified) | 40+ hours (Manufacturer specified) |
| EQ | Yes (5 band) | Yes (parametric, via app) |
| IP Rating | IP67 | IP55 |
| Bluetooth Latency | 220ms | - |
| Maximum SPL | 106dB (measured by Alan Ross Reviews) | - |
| Party Mode | Yes (Auracast) | - |
| Power Bank | Yes (USB-C) | Yes |
| Power Input | USB-C | USB-C |
| Removable Battery | Yes | - |
| TWS | Yes | No |
| Weight | 4.6 lbs (2.1 kg) | 2.9 lbs (1.3 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC, AAC, LE Audio with LC3 |
| Built-in Microphone | Yes | - |
| Stereo | Yes | Partially |
| Omnidirectional | No | Yes |
| Bluetooth Version | 5.3 | 5.3 |
| Dimensions | 11.7” x 5.9” x 5.6” (297 x 149 x 141 mm) | 7.1” x 6.4” x 2.9” (180 x 162 x 74 mm) |
| Drivers | 2x 70mm woofers, 2x 19mm tweeters + 2x passive radiators | 1x 3” woofer, 2x 1.75” wide-band drivers |
| Frequency Response | 44Hz - 20kHz (Manufacturer specified) | 54Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | 100W | 44W |
| Digital Aux Input | No | No |
| Strap | Yes (detachable shoulder strap) | Yes (detachable strap) |
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