Short answer: the Marshall Stockwell III on measured sound quality, the Zealot S67 on price. The Marshall Stockwell III ranks #79 of 115 large speakers, rated 3.0/5, at $249.99. The Zealot S67 ranks #113, rated 2.0/5, at $70.94, $179.05 cheaper.
What the Zealot S67 does well: A budget waterproof speaker with a long rated battery, USB-C charging, microSD playback, and stereo pairing. The tradeoff: Sound quality is the catch.
The Marshall Stockwell III is the better-sounding, longer-running 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 20 for the Zealot S67. At 2.9 lbs (1.3 kg) it weighs much less than the Zealot S67 at 5.3 lbs (2.4 kg). It supports AAC Bluetooth, which the Zealot S67 lacks. The catch: Highs are recessed by default and need the treble control maxed to compensate, still lacking detail even then.
Buy the Zealot S67 when the price outweighs sound quality for you, and the Marshall Stockwell III when sound quality outweighs the price instead.
Want more options? Browse the full Portable Bluetooth rankings.
A budget waterproof speaker with a long rated battery, USB-C charging, microSD playback, and stereo pairing.
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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| Zealot S67 | Marshall Stockwell III | |
|---|---|---|
| Price | $70.94 | $249.99 |
| Ranked | #113 of 115 in Large Size Portable Bluetooth Speakers | #79 of 115 in Large Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Battery Life | 20 hours (Manufacturer specified) | 40+ hours (Manufacturer specified) |
| IP Rating | IPX6 | IP55 |
| MicroSD Playback | Yes | - |
| Weight | 5.3 lbs (2.4 kg) | 2.9 lbs (1.3 kg) |
| App | No | Yes |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC, AAC, LE Audio with LC3 |
| Built-in Microphone | Yes | - |
| EQ | No | Yes (parametric, via app) |
| Party Mode | No | - |
| Power Bank | No | Yes |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Partially |
| Omnidirectional | No | Yes |
| TWS | Yes | No |
| Bluetooth Version | 5.2 | 5.3 |
| Dimensions | 11.6” x 4.8” x 5.2” (294 x 122 x 132 mm) | 7.1” x 6.4” x 2.9” (180 x 162 x 74 mm) |
| Amplifier Power | 60W | 44W |
| Drivers | 60W: Dual drivers + passive radiator | 1x 3” woofer, 2x 1.75” wide-band drivers |
| Digital Aux Input | No | No |
| Frequency Response | - | 54Hz - 20kHz (Manufacturer specified) |
| Strap | - | Yes (detachable strap) |
Related Speaker Comparisons
More top alternatives to Marshall Stockwell III: