Short answer: the Soundcore Boom 2, if you are buying new. The Soundcore Motion Boom ranks higher than the Marshall Stockwell III (#14 vs #79 of 115 large speakers) but is discontinued; its replacement, the Soundcore Boom 2, is rated 4.5/5 at $99.99 and is still sold new.
The Marshall Stockwell III is the longer-running choice. 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 Soundcore Motion Boom. It supports AAC Bluetooth, which the Soundcore Motion Boom lacks. It keeps a wired aux input, which the Soundcore Motion Boom lacks. The catch: Highs are recessed by default and need the treble control maxed to compensate, still lacking detail even then.
The Soundcore Motion Boom is the better-sounding, tougher option. A great value waterproof boombox that floats, with loud, bass rich sound, a long battery and a phone charging port. It is rated IPX7 against IP55 for the Marshall Stockwell III. Watch for: Not as neutral or detailed as other top ranked speakers.
Buy the Soundcore Boom 2, the replacement for the discontinued Soundcore Motion Boom; it is rated higher for sound quality than the Marshall Stockwell III.
Looking for alternatives? See the complete Portable Bluetooth rankings.
A stylish, rugged speaker with a very long battery you can swap yourself, a detailed app EQ, and power bank charging.
A great value waterproof boombox that floats, with loud, bass rich sound, a long battery and a phone charging port.
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
| Marshall Stockwell III | Soundcore Motion Boom | |
|---|---|---|
| Price | $249.99 | $109.99 Discontinued |
| Ranked | #79 of 115 in Large Size Portable Bluetooth Speakers | #14 of 115 in Large Size Portable Bluetooth Speakers |
| Drivers | 1x 3” woofer, 2x 1.75” wide-band drivers | 2x 63.5mm titanium fullrange drivers + 2x passive radiators |
| Frequency Response | 54Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 44W | 30W |
| Battery Life | 40+ hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | 5.0 |
| Bluetooth Codecs | SBC, AAC, LE Audio with LC3 | SBC |
| IP Rating | IP55 | IPX7 |
| Weight | 2.9 lbs (1.3 kg) | 3.3 lbs (1.5 kg) |
| Dimensions | 7.1” x 6.4” x 2.9” (180 x 162 x 74 mm) | 13.6” x 7.9” x 5.8” (346 x 200 x 148 mm) |
| App | Yes | Yes |
| EQ | Yes (parametric, via app) | Yes |
| Aux Input | Yes | No |
| Digital Aux Input | No | No |
| Power Bank | Yes | Yes (USB-A) |
| Power Input | USB-C | USB-C |
| Stereo | Partially | Yes |
| Omnidirectional | Yes | No |
| TWS | No | Yes |
| Strap | Yes (detachable strap) | - |
| Bass Extension (-10dB) | - | 53Hz |
| Bluetooth Latency | - | 170ms |
| Maximum SPL | - | 106dB (measured by Alan Ross Reviews) |
| Party Mode | - | No |
| Built-in Microphone | - | Yes |
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