Short answer: the Zealot S79. It ranks #41 of 85 large speakers by sound quality, rated 3.6/5, at $106.97; the Marshall Stockwell III ranks #61, rated 3.0/5, and costs $249.99, which makes this an easy call rather than a real tradeoff.
Why pick the Zealot S79: Loud with plenty of bass and a wider soundstage than the JBL Xtreme 3, which it beats at full volume. The tradeoff: At moderate volume the JBL Xtreme 3 is cleaner and more balanced, and one reviewer preferred the JBL Xtreme 4 in every way.
The case for the Marshall Stockwell III: 40+ hour battery life with a user-replaceable battery, strap, sleeve and grilles. The tradeoff: Highs are recessed by default and need the treble control maxed to compensate, still lacking detail even then.
Buy the Zealot S79. It is rated higher for sound quality than the Marshall Stockwell III and costs less, so only choose the other one for a particular feature it does better.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Zealot S79 | Marshall Stockwell III | |
|---|---|---|
| Price | $106.97 | $249.99 |
| Ranked | #41 of 85 in Large Size Portable Bluetooth Speakers | #61 of 85 in Large Size Portable Bluetooth Speakers |
| Amplifier Power | 100W (150W peak) | 44W |
| Drivers | 2 woofers + 2 tweeters | 1x 3” woofer, 2x 1.75” wide-band drivers |
| Battery Life | 50+ hours (Manufacturer specified) | 40+ hours (Manufacturer specified) |
| Power Bank | Yes | Yes |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | 5.3 |
| TWS | Yes | No |
| Lights | Yes | - |
| Weight | 7.3 lbs (3.3 kg) | 2.9 lbs (1.3 kg) |
| Dimensions | 13.4” x 7.2” x 5.7” (340 x 184 x 146 mm) | 7.1” x 6.4” x 2.9” (180 x 162 x 74 mm) |
| Stereo | Yes | Partially |
| Omnidirectional | No | Yes |
| Strap | Yes (detachable shoulder strap) | Yes (detachable strap) |
| Frequency Response | - | 54Hz - 20kHz (Manufacturer specified) |
| Bluetooth Codecs | - | SBC, AAC, LE Audio with LC3 |
| IP Rating | - | IP55 |
| App | - | Yes |
| EQ | - | Yes (parametric, via app) |
| Aux Input | - | Yes |
| Digital Aux Input | - | No |
| Power Input | - | USB-C |
Related Speaker Comparisons
More worthwhile head-to-heads for Zealot S79:
- JBL Xtreme 5 vs Zealot S79
- Tribit Stormbox Lava vs Zealot S79
- Soundcore Boom 2 vs Zealot S79
- Bose SoundLink Max vs Zealot S79
- JBL Xtreme 3 vs Zealot S79
Prices on this page were last checked September 30, 2026 at 2:57 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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The Two Speakers In Full
Zealot S79: $106.97 Amazon eBay
Pros: Loud with plenty of bass and a wider soundstage than the JBL Xtreme 3, which it beats at full volume. A huge 24,000mAh battery with a claimed 50+ hours doubles as a power bank, and it adds RGB lights, a shoulder strap, EQ modes and stereo pairing.
Cons: At moderate volume the JBL Xtreme 3 is cleaner and more balanced, and one reviewer preferred the JBL Xtreme 4 in every way. Its bass boost mode sounds muddy and can distort past about 70% volume, so it is best left on the normal EQ. The Harman Kardon Onyx Studio 8 digs deeper in the bass.
Full Zealot S79 review and specifications →
| Amplifier Power | 100W (150W peak) |
|---|---|
| Battery Life | 50+ hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Version | 5.3 |
| Dimensions | 13.4” x 7.2” x 5.7” (340 x 184 x 146 mm) |
| Drivers | 2 woofers + 2 tweeters |
| Lights | Yes |
| Omnidirectional | No |
| Power Bank | Yes |
| Stereo | Yes |
| Strap | Yes (detachable shoulder strap) |
| TWS | Yes |
| Weight | 7.3 lbs (3.3 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Marshall Stockwell III: $249.99 Marshall eBay
Older model: the Marshall Stockwell II (ranked higher, rated 4.5/5).
Pros: 40+ hour battery life with a user-replaceable battery, strap, sleeve and grilles. Doubles as a USB-C power bank. IP55 dust/water resistance. App includes parametric EQ, a Soundstage widening control, and wall/corner placement compensation. Endless-rotation control knobs.
Cons: Highs are recessed by default and need the treble control maxed to compensate, still lacking detail even then. Bass tends to sound resonant and boomy, with reported frequency cancellation and phase issues on complex material that EQ doesn’t fully resolve. Oluv’s A/B testing against the outgoing Stockwell II finds the default tuning muffled and muddy enough to prefer the seven-year-old original out of the box, and output loses dynamics and bass while turning harsh well below maximum volume. No aptX support.
Full Marshall Stockwell III review and specifications →
| Amplifier Power | 44W |
|---|---|
| App | Yes |
| Aux Input | Yes |
| Battery Life | 40+ hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, AAC, LE Audio with LC3 |
| Bluetooth Version | 5.3 |
| Digital Aux Input | No |
| Dimensions | 7.1” x 6.4” x 2.9” (180 x 162 x 74 mm) |
| Drivers | 1x 3” woofer, 2x 1.75” wide-band drivers |
| EQ | Yes (parametric, via app) |
| Frequency Response | 54Hz - 20kHz (Manufacturer specified) |
| IP Rating | IP55 |
| Omnidirectional | Yes |
| Power Bank | Yes |
| Power Input | USB-C |
| Stereo | Partially |
| Strap | Yes (detachable strap) |
| TWS | No |
| Weight | 2.9 lbs (1.3 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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