Short answer: the Treblab HD77. It ranks #100 of 179 medium speakers by sound quality, rated 3.1/5, at $69.97; the Ultimate Ears Boom 4 ranks #113, rated 2.9/5, and costs $114.99, so there is not much of a tradeoff to weigh.
The Treblab HD77 is the longer-running option. An affordable speaker with an aux input, long battery life, a speakerphone mic and pairing with a second unit. It is rated for 20 hours of battery against 15 for the Ultimate Ears Boom 4. It keeps a wired aux input, which the Ultimate Ears Boom 4 lacks. The tradeoff: Lacking quite a bit of bass compared to higher ranked speakers.
Why pick the Ultimate Ears Boom 4: 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 Treblab HD77 lacks. It plays in stereo from a single unit, unlike the Treblab HD77. Watch for: Not much improvement over the old ones.
Buy the Treblab HD77. It is rated higher for sound quality than the Ultimate Ears Boom 4 and costs less, so only choose the other one for a particular feature it does better.
Looking for alternatives? See the complete Portable Bluetooth rankings.
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Specifications Side By Side
| Treblab HD77 | Ultimate Ears Boom 4 | |
|---|---|---|
| Price | $69.97 | $114.99 |
| Ranked | #100 of 179 in Medium Size Portable Bluetooth Speakers | #113 of 179 in Medium Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | ~66Hz | - |
| Battery Life | 20 hours (Manufacturer specified) | 15 hours (Manufacturer specified) |
| Built-in Microphone | Yes | No |
| IP Rating | IPX7 | IP67 |
| Stereo | No (front/rear drivers) | Yes |
| Omnidirectional | Yes | No |
| TWS | Yes | Yes |
| Weight | 1.4 lbs (637 g) | 1.4 lbs (620 g) |
| Wi-Fi | No | - |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.0 | 5.1 |
| Drivers | 2x 48mm fullrange | 2x 1.57” (40mm) active drivers + 2x 1.81” x 2.57” (46.1 x 65.2mm) passive radiators |
| Dimensions | 7.4” x 3” x 3” (187 x 76 x 76 mm) | 7.2” x 2.9” x 2.9” (184 x 73 x 73 mm) |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 25W RMS | - |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC (additional codecs unverified) | SBC |
| App | No | Yes |
| Aux Input | Yes | No |
| EQ | No | Yes (via app) |
| Power Input | USB-C | USB-C |
| Power Bank | - | No |
| Maximum SPL | - | 85dBC (Manufacturer specified) |
| Strap | - | Yes (built-in loop) |
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