Short answer: the Soundcore Motion X600. It ranks #19 of 115 large speakers by sound quality, rated 4.3/5, at $159.99; the Marshall Stockwell III ranks #79, rated 3.0/5, and costs $249.99, which makes this an easy call rather than a real tradeoff.
The Soundcore Motion X600 is the better-sounding, tougher choice. A stereo speaker with impressive sound after its latest firmware update, especially with a well tuned EQ. It is rated IPX7 against IP55 for the Marshall Stockwell III. It supports LDAC Bluetooth, which the Marshall Stockwell III lacks. The catch: Stock frequency response is wavy.
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 X600. At 2.9 lbs (1.3 kg) it weighs much less than the Soundcore Motion X600 at 5.2 lbs (2.35 kg). It has an adjustable EQ, which the Soundcore Motion X600 lacks. The tradeoff: Highs are recessed by default and need the treble control maxed to compensate, still lacking detail even then.
Buy the Soundcore Motion X600. 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.
Want more options? Browse the full Portable Bluetooth rankings.
A stereo speaker with impressive sound after its latest firmware update, especially with a well tuned EQ.
A stylish, rugged speaker with a very long battery you can swap yourself, a detailed app EQ, and power bank charging.
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Specifications Side By Side
| Soundcore Motion X600 | Marshall Stockwell III | |
|---|---|---|
| Price | $159.99 | $249.99 |
| Ranked | #19 of 115 in Large Size Portable Bluetooth Speakers | #79 of 115 in Large Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Aux Latency | 0ms | - |
| Bass Extension (-10dB) | 52Hz | - |
| Battery Life | 12 hours (Manufacturer specified) | 40+ hours (Manufacturer specified) |
| IP Rating | IPX7 | IP55 |
| Bluetooth Latency | 83ms | - |
| Maximum SPL | 104dB (measured by Alan Ross Reviews) | - |
| Power Bank | Yes (USB-C) | Yes |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Partially |
| Omnidirectional | No | Yes |
| TWS | Yes | No |
| Weight | 5.2 lbs (2.35 kg) | 2.9 lbs (1.3 kg) |
| App | No | Yes |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | LDAC, SBC | SBC, AAC, LE Audio with LC3 |
| Built-in Microphone | Yes | - |
| EQ | No | Yes (parametric, via app) |
| Party Mode | Yes (PartyCast up to 100 speakers) | - |
| Bluetooth Version | 5.3 | 5.3 |
| Dimensions | 11.8” x 4.8” x 3.2” (300 x 121 x 81 mm) | 7.1” x 6.4” x 2.9” (180 x 162 x 74 mm) |
| Drivers | 2x 60mm woofers, 2x 27mm tweeters, 1x 50mm upward-firing driver | 1x 3” woofer, 2x 1.75” wide-band drivers |
| Frequency Response | 50Hz - 40kHz (Manufacturer specified) | 54Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | 50W | 44W |
| Digital Aux Input | No | No |
| Strap | No | Yes (detachable strap) |
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