Short answer: the Soundcore Motion X500. It ranks #27 of 120 large speakers by sound quality, rated 4.1/5, at $99.99; the Marshall Stockwell III ranks #84, rated 3.0/5, and costs $249.99, so there is not much of a tradeoff to weigh.
The Soundcore Motion X500 is the better-sounding, tougher option. A compact, waterproof stereo speaker with good sound and solid build for the money. It is rated IPX7 against IP55 for the Marshall Stockwell III. It supports LDAC Bluetooth, which the Marshall Stockwell III lacks. Watch for: A little bright on top, a custom EQ can flatten things out a bit.
The Marshall Stockwell III is the longer-running, lighter pick. 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 12 for the Soundcore Motion X500. At 2.9 lbs (1.3 kg) it weighs much less than the Soundcore Motion X500 at 4.6 lbs (2.1 kg). The tradeoff: Highs are recessed by default and need the treble control maxed to compensate, still lacking detail even then.
Buy the Soundcore Motion X500. It is rated higher for sound quality than the Marshall Stockwell III and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Prices on this page were last checked November 11, 2026 at 3:26 AM 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
| Soundcore Motion X500 | Marshall Stockwell III | |
|---|---|---|
| Price | $99.99 | $249.99 |
| Ranked | #27 of 120 in Large Size Portable Bluetooth Speakers | #84 of 120 in Large Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Bass Extension (-10dB) | 48Hz | - |
| Battery Life | 12 hours (Manufacturer specified) | 40+ hours (Manufacturer specified) |
| EQ | Yes | Yes (parametric, via app) |
| IP Rating | IPX7 | IP55 |
| Maximum SPL | 104dB (measured by Alan Ross Reviews) | - |
| Party Mode | No | - |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Partially |
| Omnidirectional | No | Yes |
| TWS | Yes | No |
| Weight | 4.6 lbs (2.1 kg) | 2.9 lbs (1.3 kg) |
| Aux Input | Yes | Yes |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | LDAC, SBC | SBC, AAC, LE Audio with LC3 |
| Built-in Microphone | Yes | - |
| Power Bank | No | Yes |
| Bluetooth Version | 5.3 | 5.3 |
| Dimensions | 8.7” x 8” x 3.2” (220 x 202 x 81 mm) | 7.1” x 6.4” x 2.9” (180 x 162 x 74 mm) |
| Drivers | 2x 58mm (2.3”) forward-firing full-range drivers + 1x 43mm (1.7”) upward-firing driver | 1x 3” woofer, 2x 1.75” wide-band drivers |
| Frequency Response | 50Hz - 40kHz (Manufacturer specified) | 54Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | 40W | 44W |
| Digital Aux Input | No | No |
| Strap | No | Yes (detachable strap) |
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