Short answer: the Ultimate Ears Boom 4, though neither ranks well in its class. It ranks #113 of 179 medium speakers by sound quality, rated 2.9/5, at $114.99. The DBSONO X-Blast F37 ranks #117, rated 2.8/5, at $69.99, $45 cheaper, which does not close the gap in sound quality. Both are rated below 3.0/5 among the 179 medium speakers, and the EarFun Uboom L, ranked #2 at $49.79, is a better place to start if sound quality matters.
The Ultimate Ears Boom 4 is the longer-running, tougher option. A tough waterproof speaker that floats, with USB-C charging, app EQ and pairing with other UE speakers. It is rated for 15 hours of battery against 8 for the DBSONO X-Blast F37. It is rated IP67 against IPX5 for the DBSONO X-Blast F37. It plays in stereo from a single unit, unlike the DBSONO X-Blast F37. The tradeoff: Not much improvement over the old ones.
What the DBSONO X-Blast F37 does well: An affordable splash resistant speaker with a separate woofer and tweeter, long Bluetooth range and stereo pairing. Watch for: Very recessed lower mids, peaky upper mids, just not a great frequency response overall.
Buy the Ultimate Ears Boom 4. It is rated higher for sound quality, and the $45 you would save on the DBSONO X-Blast F37 does not close the gap.
Looking for alternatives? See the complete 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 | DBSONO X-Blast F37 | |
|---|---|---|
| Price | $114.99 | $69.99 |
| Ranked | #113 of 179 in Medium Size Portable Bluetooth Speakers | #117 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | - |
| Battery Life | 15 hours (Manufacturer specified) | 8 hours (Manufacturer specified) |
| IP Rating | IP67 | IPX5 |
| Power Input | USB-C | USB-C |
| Stereo | Yes | No |
| Omnidirectional | No | No |
| Weight | 1.4 lbs (620 g) | 1.7 lbs (771 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.1 | 6.0 |
| Dimensions | 7.2” x 2.9” x 2.9” (184 x 73 x 73 mm) | 8” x 2.5” x 3.6” (202 x 64 x 90.9 mm) |
| Drivers | 2x 1.57” (40mm) active drivers + 2x 1.81” x 2.57” (46.1 x 65.2mm) passive radiators | 25W woofer, 10W tweeter, passive radiator |
| TWS | Yes | Yes |
| EQ | Yes (via app) | Yes (Bass Boost) |
| Built-in Microphone | No | - |
| Power Bank | No | - |
| Aux Input | No | No |
| 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) | - | 49Hz |
| Frequency Response | - | 100Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | - | 35W |
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