Short answer: the Marshall Emberton III, though neither ranks well in its class. It ranks #115 of 157 medium speakers by sound quality (rated 2.7/5); the Boat Stone 350 ranks #135 (rated 2.3/5). Both are rated below 3.0/5 among the 157 medium speakers, so if sound quality matters, consider the Earfun Uboom L instead, ranked #1 at $49.79.
The Marshall Emberton III is the better-sounding, deeper-bass option. 30 hour battery life: among the best in its class; a 20 min quick-charge gives 4 hours. Its bass reaches about 62Hz before falling 10dB, against 87Hz for the Boat Stone 350. It is rated for 32 hours of battery against 6 for the Boat Stone 350. The tradeoff: Strange unnatural echo-like sound coloration, bass not as deep as competitors.
The Boat Stone 350 is the lighter option. 10W cylindrical stereo speaker with dual passive radiators, IPX7 water resistance, microSD card slot, and 3.5mm aux input. At 0.9 lbs (426 g) it weighs noticeably less than the Marshall Emberton III at 1.5 lbs (673 g). It keeps a wired aux input, which the Marshall Emberton III lacks. Watch for: Midrange peaks with rolled-off treble.
Buy the Marshall Emberton III. It is rated higher for sound quality than the Boat Stone 350.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Marshall Emberton III | Boat Stone 350 | |
|---|---|---|
| Price | $129.99 | - |
| Ranked | #115 of 157 in Medium Size Portable Bluetooth Speakers | #135 of 157 in Medium Size Portable Bluetooth Speakers |
| App | Yes | No |
| Bass Extension (-10dB) | 62Hz | 87Hz |
| Battery Life | 32 hours (Manufacturer specified) | 6 hours (Manufacturer specified) |
| Party Mode | Yes (Marshall Stack) | - |
| Weight | 1.5 lbs (673 g) | 0.9 lbs (426 g) |
| IP Rating | IP67 | IPX7 |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | 5.0 |
| Dimensions | 6.3” x 2.7” x 3” (160 x 68 x 76 mm) | 3.5” x 7.1” (90 x 180 mm) |
| Drivers | 2x 2” full-range cone drivers + 2x 2” passive radiators | 2x 20mm tweeters + 2x 45mm drivers |
| TWS | No | Yes |
| EQ | Yes (3 presets via app) | Yes (multiple modes) |
| Built-in Microphone | Yes | Yes |
| Stereo | Yes | Yes |
| Omnidirectional | Yes | No |
| Power Input | USB-C | USB-C |
| Power Bank | No | - |
| Aux Input | No | Yes |
| Amplifier Power | 20W | 10W |
| Bluetooth Codecs | SBC | SBC (inferred; additional codecs unverified) |
| Digital Aux Input | No | No |
| Strap | No | No |
| MicroSD Playback | - | Yes |
Related Speaker Comparisons
How Marshall Emberton III compares with other leading options:
- Marshall Emberton III vs Earfun Uboom L
- Soundcore Motion 300 vs Marshall Emberton III
- Soundcore Motion+ vs Marshall Emberton III
- Soundcore Boost “upgraded” 2021 vs Marshall Emberton III
- Marshall Emberton III vs Minirig 4
Prices on this page were last checked October 2, 2026 at 10:18 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
Marshall Emberton III: $129.99 Amazon eBay
Older model: the Marshall Emberton II (ranked lower, rated 2.7/5).
Pros: 30 hour battery life: among the best in its class; a 20 min quick-charge gives 4 hours. IP67 rated, durable rubbery build using 50% recycled plastic. Measured bass extension of 62Hz (-10dB).
Cons: Strange unnatural echo-like sound coloration, bass not as deep as competitors. Not technically a 360 speaker, only front and rear. Not very loud. Not really any different from the Emberton II except having the treble turned down a little bit.
Full Marshall Emberton III review and specifications →
| Amplifier Power | 20W |
|---|---|
| App | Yes |
| Aux Input | No |
| Bass Extension (-10dB) | 62Hz |
| Battery Life | 32 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 6.3” x 2.7” x 3” (160 x 68 x 76 mm) |
| Drivers | 2x 2” full-range cone drivers + 2x 2” passive radiators |
| EQ | Yes (3 presets via app) |
| IP Rating | IP67 |
| Omnidirectional | Yes |
| Party Mode | Yes (Marshall Stack) |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | No |
| TWS | No |
| Weight | 1.5 lbs (673 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Marshall Emberton III vs Bose SoundLink Color II
- Marshall Emberton III vs Marshall Emberton II
- Marshall Emberton III vs Yamaha True X Speaker 1A
- Marshall Emberton III vs Teufel Rockster Go
- Marshall Emberton III vs Sony SRS-XB20
- Marshall Emberton III vs Sony SRS-XB30
- Marshall Emberton III vs Tribit Stormbox
- Marshall Emberton III vs Soundcore Flare 2
- See all 134 comparisons
Boat Stone 350 eBay
Pros: 10W cylindrical stereo speaker with dual passive radiators, IPX7 water resistance, microSD card slot, and 3.5mm aux input. Measured bass extension of 87Hz (-10dB).
Cons: Midrange peaks with rolled-off treble. Bass extension limited below 87Hz.
Full Boat Stone 350 review and specifications →
| Amplifier Power | 10W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 87Hz |
| Battery Life | 6 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) |
| Bluetooth Version | 5.0 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 3.5” x 7.1” (90 x 180 mm) |
| Drivers | 2x 20mm tweeters + 2x 45mm drivers |
| EQ | Yes (multiple modes) |
| IP Rating | IPX7 |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | No |
| TWS | Yes |
| Weight | 0.9 lbs (426 g) |
- Links
- Reviews, Comparisons and Sound Samples
- No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
- Head-to-Head Comparisons
- Boat Stone 350 vs Boat Stone 352
- Boat Stone 350 vs Doss Soundbox Pro
- Boat Stone 350 vs Marshall Emberton II
- Boat Stone 350 vs Ultimate Ears Boom 4
- Boat Stone 350 vs Ultimate Ears Wonderboom 4
- Boat Stone 350 vs Soundcore 2
- Boat Stone 350 vs Sony ULT Field 1
- Boat Stone 350 vs JBL Grip
- See all 29 comparisons