Short answer: the Marshall Stockwell III. It ranks #79 of 115 large speakers by sound quality, rated 3.0/5, at $249.99. The Ultimate Ears Epicboom ranks #84, rated 2.9/5, at $228.59, $21.40 cheaper, which does not close the gap in sound quality.
The Marshall Stockwell III is the longer-running, lighter option. 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 17 for the Ultimate Ears Epicboom. At 2.9 lbs (1.3 kg) it weighs noticeably less than the Ultimate Ears Epicboom at 4.3 lbs (1.97 kg). It supports AAC Bluetooth, which the Ultimate Ears Epicboom lacks. The catch: Highs are recessed by default and need the treble control maxed to compensate, still lacking detail even then.
The Ultimate Ears Epicboom is the tougher option. A rugged, floating waterproof speaker made mostly from recycled materials, with long Bluetooth range and USB-C charging. It is rated IPX7 against IP55 for the Marshall Stockwell III. The catch: Not very deep bass for the size.
Buy the Marshall Stockwell III. It is rated higher for sound quality, and the $21.40 you would save on the Ultimate Ears Epicboom does not close the gap.
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 rugged, floating waterproof speaker made mostly from recycled materials, with long Bluetooth range and USB-C charging.
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Specifications Side By Side
| Marshall Stockwell III | Ultimate Ears Epicboom | |
|---|---|---|
| Price | $249.99 | $228.59 |
| Ranked | #79 of 115 in Large Size Portable Bluetooth Speakers | #84 of 115 in Large Size Portable Bluetooth Speakers |
| Drivers | 1x 3” woofer, 2x 1.75” wide-band drivers | 1x 120mm woofer, 2x 45mm tweeters |
| Frequency Response | 54Hz - 20kHz (Manufacturer specified) | 50Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | 44W | 10W RMS |
| Battery Life | 40+ hours (Manufacturer specified) | 17 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | 5.2 |
| Bluetooth Codecs | SBC, AAC, LE Audio with LC3 | SBC |
| IP Rating | IP55 | IPX7 |
| Weight | 2.9 lbs (1.3 kg) | 4.3 lbs (1.97 kg) |
| Dimensions | 7.1” x 6.4” x 2.9” (180 x 162 x 74 mm) | 4.7” x 9.5” x 6.4” (119 x 241 x 162 mm) |
| App | Yes | No |
| EQ | Yes (parametric, via app) | No |
| Aux Input | Yes | Yes |
| Digital Aux Input | No | No |
| Power Bank | Yes | No |
| Power Input | USB-C | USB-C |
| Stereo | Partially | Yes |
| Omnidirectional | Yes | No |
| TWS | No | Yes |
| Strap | Yes (detachable strap) | Yes (built-in loop) |
| Bass Extension (-10dB) | - | ~55Hz |
| Built-in Microphone | - | Yes |
| Party Mode | - | No |
| Maximum SPL | - | 94dB (Manufacturer specified) |
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