Short answer: the Ultimate Ears Boom 4. It ranks #86 of 134 medium speakers at $105; the Ultimate Ears Boom 3 ranks #87 and costs $113, so there is not much of a tradeoff to weigh.
On the Ultimate Ears Boom 3 side: Rich and warm bass without muddying mix, crisp highs, excellent 15-hour battery life, stable Bluetooth connectivity, IP67 rated and floats. The catch: Not stereo, barely any bass, recessed treble.
The case for the Ultimate Ears Boom 4: IP67 rated, floats, and finally charges via USB-C instead of the older Booms’ Micro-USB. Set against that: Not much improvement over the old ones.
Buy the Ultimate Ears Boom 3 if the price matters more than the ranking. Buy the Ultimate Ears Boom 4 if the ranking matters more than the price.
Specifications Side By Side
| Ultimate Ears Boom 3 | Ultimate Ears Boom 4 | |
|---|---|---|
| Price | $113 | $105 |
| Ranked | #87 of 134 in Medium Size Portable Bluetooth Speakers | #86 of 134 in Medium Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | 91Hz | - |
| Battery Life | 15 hours (Manufacturer specified) | 15 hours (Manufacturer specified) |
| Party Mode | Yes (PartyUp up to 50 speakers) | - |
| Power Input | Micro USB | USB-C |
| Stereo | Yes | Yes |
| Weight | 1.3 lbs / 608 g | 1.4 lbs / 620 g |
| IP Rating | IP67 | IP67 |
| Bluetooth Version | 4.2 | 5.1 |
| Dimensions | 7.24" x 2.87" (184 x 73 mm) | 7.24" x 2.9" x 2.9" (184 x 73 x 73 mm) |
| Drivers | 2x 2" active drivers + 2x 2" x 4" passive radiators | 2x 1.57" (40mm) active drivers + 2x 1.81" x 2.57" (46.1 x 65.2mm) passive radiators |
| TWS | Yes | Yes |
| EQ | Yes (via app) | Yes (via app) |
| Built in Microphone | No | No |
| Max Volume | 87dB | 85dBC |
| App | - | Yes |
| Power Bank | - | No |
| Aux Input | - | No |
The Two Speakers In Full
Ultimate Ears Boom 3: $113 Amazon
Pros: Rich and warm bass without muddying mix, crisp highs, excellent 15-hour battery life, stable Bluetooth connectivity, IP67 rated and floats, rugged fabric shell, can pair up to 150 speakers via PartyUp
Cons: Not stereo, barely any bass, recessed treble. You can tell from the micro USB that they are just feeding you the same crap hardware over and over, this is inexcusable for a product released in 2021. Lots of mentions of failing batteries on amazon. Not technically a 360 speaker, only front and rear.
| Bass Extension (-10dB) | 91Hz |
|---|---|
| Battery Life | 15 hours (Manufacturer specified) |
| Bluetooth Version | 4.2 |
| Built in Microphone | No |
| Dimensions | 7.24" x 2.87" (184 x 73 mm) |
| Drivers | 2x 2" active drivers + 2x 2" x 4" passive radiators |
| EQ | Yes (via app) |
| IP Rating | IP67 |
| Max Volume | 87dB |
| Party Mode | Yes (PartyUp up to 50 speakers) |
| Power Input | Micro USB |
| Stereo | Yes |
| TWS | Yes |
| Weight | 1.3 lbs / 608 g |
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Ultimate Ears Boom 4: $105 Amazon
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%
| App | Yes |
|---|---|
| Aux Input | No |
| Battery Life | 15 hours (Manufacturer specified) |
| Bluetooth Version | 5.1 |
| Built in Microphone | No |
| Dimensions | 7.24" 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 |
| Max Volume | 85dBC |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| Weight | 1.4 lbs / 620 g |
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Product prices and availability were last checked August 9, 2026 at 6:57 AM UTC 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.