Short answer: the Ultimate Ears Everboom. It ranks #35 of 115 large speakers by sound quality, rated 3.9/5, at $149.99; the Marshall Stockwell III ranks #79, rated 3.0/5, and costs $249.99, so there is little reason to consider the other one.
The Marshall Stockwell III is the 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 Ultimate Ears Everboom. It supports AAC Bluetooth, which the Ultimate Ears Everboom lacks. The tradeoff: Highs are recessed by default and need the treble control maxed to compensate, still lacking detail even then.
The Ultimate Ears Everboom is the better-sounding, lighter pick. A light, waterproof speaker that plays in every direction, with warm sound, a long battery and linking with many speakers. At 2.1 lbs (949 g) it weighs noticeably less than the Marshall Stockwell III at 2.9 lbs (1.3 kg). It is rated IP67 against IP55 for the Marshall Stockwell III. Watch for: Careful placement and volume setting remain important for balanced sound.
Buy the Ultimate Ears Everboom. 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 stylish, rugged speaker with a very long battery you can swap yourself, a detailed app EQ, and power bank charging.
A light, waterproof speaker that plays in every direction, with warm sound, a long battery and linking with many speakers.
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
| Marshall Stockwell III | Ultimate Ears Everboom | |
|---|---|---|
| Price | $249.99 | $149.99 |
| Ranked | #79 of 115 in Large Size Portable Bluetooth Speakers | #35 of 115 in Large Size Portable Bluetooth Speakers |
| Drivers | 1x 3” woofer, 2x 1.75” wide-band drivers | 2x 56.6mm x 56.2mm fullrange transducers + 2x passive radiators |
| Frequency Response | 54Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 44W | 14W |
| Battery Life | 40+ hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | 5.1 |
| Bluetooth Codecs | SBC, AAC, LE Audio with LC3 | SBC |
| IP Rating | IP55 | IP67 |
| Weight | 2.9 lbs (1.3 kg) | 2.1 lbs (949 g) |
| Dimensions | 7.1” x 6.4” x 2.9” (180 x 162 x 74 mm) | 8.1” x 3.3” x 4.3” (205 x 85 x 110 mm) |
| App | Yes | Yes |
| EQ | Yes (parametric, via app) | Yes |
| Aux Input | Yes | Yes |
| Digital Aux Input | No | No |
| Power Bank | Yes | No |
| Power Input | USB-C | USB-C |
| Stereo | Partially | No |
| Omnidirectional | Yes | Yes |
| TWS | No | No |
| Strap | Yes (detachable strap) | Yes (built-in loop) |
| Party Mode | - | Yes (PartyUp up to 50 speakers) |
| Built-in Microphone | - | Yes |
Related Speaker Comparisons
More worthwhile head-to-heads for Ultimate Ears Everboom: