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 #93 of 144 medium speakers, rated 2.9/5, at $119.99. The Doss E-Go II ranks #118, rated 2.5/5, at $29.90, $90.09 cheaper. Both are rated below 3.0/5 among the 144 medium speakers; for better sound, the Earfun Uboom L ranks #1 at $49.79.
Why pick the Ultimate Ears Boom 4: IP67 rated, floats, and finally charges via USB-C instead of the older Booms’ Micro-USB. The catch: Not much improvement over the old ones.
What the Doss E-Go II does well: Very portable (water bottle sized), truly waterproof (IPX6), 12-hour battery life, excellent value for money, fast Bluetooth pairing. The catch: 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.
Specifications Side By Side
| Ultimate Ears Boom 4 | Doss E-Go II | |
|---|---|---|
| Price | $119.99 | $29.90 |
| Ranked | #93 of 144 in Medium Size Portable Bluetooth Speakers | #118 of 144 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 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) | - |
| Bass Extension (-10dB) | - | 120Hz |
| MicroSD Playback | - | Yes |
| Amplifier Power | - | 12W |
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Prices on this page were last checked September 26, 2026 at 11:14 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
Ultimate Ears Boom 4: $119.99 Amazon eBay
Older model: the Ultimate Ears Boom 3 (rated 2.9/5).
Pros: IP67 rated, floats, and finally charges via USB-C instead of the older Booms’ Micro-USB. 15 hour battery. Customizable EQ and speaker-pairing via the UE app.
Cons: Not much improvement over the old ones. Weak bass extension and thuddy bass. Gets distorted above 90%
Full Ultimate Ears Boom 4 review and specifications →
| App | Yes |
|---|---|
| Aux Input | No |
| Battery Life | 15 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.1 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 7.2” x 2.9” x 2.9” (184 x 73 x 73 mm) |
| Drivers | 2x 1.57” (40mm) active drivers + 2x 1.81” x 2.57” (46.1 x 65.2mm) passive radiators |
| EQ | Yes (via app) |
| IP Rating | IP67 |
| Maximum SPL | 85dBC (Manufacturer specified) |
| Omnidirectional | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (built-in loop) |
| TWS | Yes |
| Weight | 1.4 lbs (620 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Ultimate Ears Boom 4 vs Ultimate Ears Boom 3
- Ultimate Ears Boom 4 vs Ultimate Ears Wonderboom
- Ultimate Ears Boom 4 vs Klipsch Groove/Heritage Groove
- Ultimate Ears Boom 4 vs Ultimate Ears Wonderboom 2
- Ultimate Ears Boom 4 vs Ultimate Ears Wonderboom 3
- Ultimate Ears Boom 4 vs DBSONO X-Blast F37
- Ultimate Ears Boom 4 vs Ultimate Ears Wonderboom 4
- Ultimate Ears Boom 4 vs Sony SRS-XE300
- See all 113 comparisons
Doss E-Go II: $29.90 Amazon eBay
Pros: Very portable (water bottle sized), truly waterproof (IPX6), 12-hour battery life, excellent value for money, fast Bluetooth pairing. Measured bass extension of 120Hz (-10dB).
Cons: Horribly bad unless turned up, still not great
Full Doss E-Go II review and specifications →
| Amplifier Power | 12W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 120Hz |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) |
| Bluetooth Version | 4.1 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 7.8” x 2.5” x 2” (198 x 63 x 51 mm) |
| Drivers | 2x 6W full-range drivers + 1x passive radiator |
| EQ | No |
| IP Rating | IPX6 |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Power Input | Micro USB |
| Stereo | Yes |
| TWS | No |
| Weight | 0.9 lbs (399 g) |
- 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
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