These are not really the same size class, and that is the honest framing here. The Bose Soundlink Micro ranks #20 of 62 small speakers by sound quality at $99.99; the Ultimate Ears Boom 4 ranks #113 of 179 medium speakers by sound quality at $114.99.
The Bose Soundlink Micro is the lighter option. A rugged waterproof pocket speaker with a built in strap, party pairing, and low Bluetooth delay for video. At 0.6 lbs (289 g) it weighs much less than the Ultimate Ears Boom 4 at 1.4 lbs (620 g).
The Ultimate Ears Boom 4 is the longer-running pick. 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 6 for the Bose Soundlink Micro. It has an adjustable EQ, which the Bose Soundlink Micro lacks. It plays in stereo from a single unit, unlike the Bose Soundlink Micro. Watch for: Not much improvement over the old ones.
Buy the Bose Soundlink Micro at $99.99 for a small speaker, or the Ultimate Ears Boom 4 at $114.99 for a medium speaker instead.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
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
| Bose Soundlink Micro | Ultimate Ears Boom 4 | |
|---|---|---|
| Price | $99.99 | $114.99 |
| Ranked | #20 of 62 in Small Size Portable Bluetooth Speakers | #113 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Bass Extension (-10dB) | 66Hz | - |
| Battery Life | 6 hours (Manufacturer specified) | 15 hours (Manufacturer specified) |
| Built-in Microphone | Yes | No |
| EQ | No | Yes (via app) |
| IP Rating | IP67 | IP67 |
| Bluetooth Latency | 50ms | - |
| Maximum SPL | 90dB (measured by Alan Ross Reviews) | 85dBC (Manufacturer specified) |
| Party Mode | Yes (Bose Party mode) | - |
| Power Bank | No | No |
| Power Input | Micro USB | USB-C |
| Stereo | No | Yes |
| Omnidirectional | Pointing up | No |
| TWS | Yes | Yes |
| Weight | 0.6 lbs (289 g) | 1.4 lbs (620 g) |
| Aux Input | No | No |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Bluetooth Version | 4.2 | 5.1 |
| Dimensions | 3.9” x 3.9” x 1.4” (98 x 98 x 35 mm) | 7.2” x 2.9” x 2.9” (184 x 73 x 73 mm) |
| Drivers | 40mm with dual passive radiators | 2x 1.57” (40mm) active drivers + 2x 1.81” x 2.57” (46.1 x 65.2mm) passive radiators |
| Charging Time | 3 hours | - |
| Amplifier Power | 5W | - |
| Digital Aux Input | No | No |
| Strap | Yes (built-in strap) | Yes (built-in loop) |
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