Short answer: the Ultimate Ears Boom 4, because it finally adds USB-C charging to the same IP67 floating design, though neither ranks well in its class. It matches the Boom 3’s rich, warm bass, crisp highs, 15-hour battery and stable Bluetooth, and swaps the old Micro-USB for USB-C, though it is not much of an improvement otherwise. Neither is stereo and both have recessed treble. Both are rated below 3.0/5 among the 179 medium speakers; for better sound, the EarFun Uboom L ranks #2 at $49.79.
Buy the Ultimate Ears Boom 4. Both are rated the same for sound quality, and it costs $18 less than the Ultimate Ears Boom 3.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
A rugged waterproof speaker that floats, with a fabric shell, a stable Bluetooth connection and PartyUp linking for many speakers.
A tough waterproof speaker that floats, with USB-C charging, app EQ and pairing with other UE speakers.
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 3 | Ultimate Ears Boom 4 | |
|---|---|---|
| Price | $132.99 | $114.99 |
| Ranked | #114 of 179 in Medium Size Portable Bluetooth Speakers | #113 of 179 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 |
| Omnidirectional | Yes | No |
| Weight | 1.3 lbs (608 g) | 1.4 lbs (620 g) |
| IP Rating | IP67 | IP67 |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 4.2 | 5.1 |
| Dimensions | 7.2” x 2.9” (184 x 73 mm) | 7.2” 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 |
| Maximum SPL | 87dB (Manufacturer specified) | 85dBC (Manufacturer specified) |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC | SBC |
| App | Yes (Ultimate Ears BOOM & MEGABOOM app) | Yes |
| Aux Input | No | No |
| Strap | Yes (built-in loop) | Yes (built-in loop) |
| Power Bank | - | No |
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