Short answer: the Ultimate Ears Boom 4 for better sound quality, the DOSS E-Go II for the lower price, though neither ranks well in its class. The Ultimate Ears Boom 4 ranks #113 of 179 medium speakers, rated 2.9/5, at $114.99. The DOSS E-Go II ranks #148, rated 2.5/5, at $39.90, $75.09 cheaper. Both are rated below 3.0/5 among the 179 medium speakers; for better sound, the EarFun Uboom L ranks #2 at $49.79.
The Ultimate Ears Boom 4 is the better-sounding pick. A tough waterproof speaker that floats, with USB-C charging, app EQ and pairing with other UE speakers. It has an adjustable EQ, which the DOSS E-Go II lacks. It charges over USB-C rather than Micro USB. The tradeoff: Not much improvement over the old ones.
The DOSS E-Go II is the lighter option. A water bottle sized stereo speaker with water resistance and quick pairing, light enough for a cup holder or bag. At 0.9 lbs (399 g) it weighs noticeably less than the Ultimate Ears Boom 4 at 1.4 lbs (620 g). It keeps a wired aux input, which the Ultimate Ears Boom 4 lacks. The tradeoff: Horribly bad unless turned up, still not great.
Buy the Ultimate Ears Boom 4 if sound quality is the priority over the price, or the DOSS E-Go II if the price is the priority over sound quality.
Want more options? Browse the full Portable Bluetooth rankings.
Prices on this page were last checked November 7, 2026 at 7:34 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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Specifications Side By Side
| Ultimate Ears Boom 4 | DOSS E-Go II | |
|---|---|---|
| Price | $114.99 | $39.90 |
| Ranked | #113 of 179 in Medium Size Portable Bluetooth Speakers | #148 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | No |
| Battery Life | 15 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| IP Rating | IP67 | IPX6 |
| Power Input | USB-C | Micro USB |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| Weight | 1.4 lbs (620 g) | 0.9 lbs (399 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.1 | 4.1 |
| Dimensions | 7.2” x 2.9” x 2.9” (184 x 73 x 73 mm) | 7.8” x 2.5” x 2” (198 x 63 x 51 mm) |
| Drivers | 2x 1.57” (40mm) active drivers + 2x 1.81” x 2.57” (46.1 x 65.2mm) passive radiators | 2x 6W full-range drivers + 1x passive radiator |
| TWS | Yes | No |
| EQ | Yes (via app) | No |
| Built-in Microphone | No | Yes |
| Power Bank | No | - |
| Aux Input | No | Yes |
| Maximum SPL | 85dBC (Manufacturer specified) | - |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC | SBC (inferred; additional codecs unverified) |
| Strap | Yes (built-in loop) | Yes (strap) |
| Bass Extension (-10dB) | - | 120Hz |
| MicroSD Playback | - | Yes |
| Amplifier Power | - | 12W |
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