These are not really the same size class, and that is the honest framing here. The Bose Soundlink Micro ranks #19 of 47 small speakers by sound quality at $83.99; the Ultimate Ears Boom 4 ranks #93 of 144 medium speakers by sound quality at $119.99.
The case for the Bose Soundlink Micro: Bose Soundlink Micro uses 40mm with dual passive radiators. The tradeoff: Bass is limited by its 66Hz specification.
The case for the Ultimate Ears Boom 4: IP67 rated, floats, and finally charges via USB-C instead of the older Booms’ Micro-USB. Watch for: Not much improvement over the old ones.
Buy the Bose Soundlink Micro at $83.99 for a small speaker, or the Ultimate Ears Boom 4 at $119.99 for a medium speaker instead.
Battery life favors the Ultimate Ears Boom 4: rated for 15 hours against 6 hours for the Bose Soundlink Micro.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| Bose Soundlink Micro | Ultimate Ears Boom 4 | |
|---|---|---|
| Price | $83.99 | $119.99 |
| Ranked | #19 of 47 in Small Size Portable Bluetooth Speakers | #93 of 144 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 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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Prices on this page were last checked September 26, 2026 at 11:14 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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The Two Speakers In Full
Bose Soundlink Micro: $83.99 Amazon eBay
Newer model: the Bose Soundlink Micro 2, rated 3.6/5.
Pros: Bose Soundlink Micro uses 40mm with dual passive radiators. Its 289 g, claimed 6 hours (Manufacturer specified) battery life, IP67 protection, up to 90dB and mono playback make it a practical option for its intended room or portable use. A rugged rubberized coating, a strap and Bose Party mode for pairing multiple speakers. Measured bass extension of 66Hz (-10dB).
Cons: Bass is limited by its 66Hz specification. No EQ adjustment.
Full Bose Soundlink Micro review and specifications →
| Amplifier Power | 5W |
|---|---|
| App | Yes |
| Aux Input | No |
| Bass Extension (-10dB) | 66Hz |
| Battery Life | 6 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Latency | 50ms |
| Bluetooth Version | 4.2 |
| Built-in Microphone | Yes |
| Charging Time | 3 hours |
| Digital Aux Input | No |
| Dimensions | 3.9” x 3.9” x 1.4” (98 x 98 x 35 mm) |
| Drivers | 40mm with dual passive radiators |
| EQ | No |
| IP Rating | IP67 |
| Maximum SPL | 90dB (measured by Alan Ross Reviews) |
| Omnidirectional | Pointing up |
| Party Mode | Yes (Bose Party mode) |
| Power Bank | No |
| Power Input | Micro USB |
| Stereo | No |
| Strap | Yes (built-in strap) |
| TWS | Yes |
| Weight | 0.6 lbs (289 g) |
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Ultimate Ears Boom 4: $119.99 Amazon eBay
Older model: the Ultimate Ears Boom 3 (rated 2.9/5).
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%
Full Ultimate Ears Boom 4 review and specifications →
| App | Yes |
|---|---|
| Aux Input | No |
| Battery Life | 15 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.1 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 7.2” 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 |
| Maximum SPL | 85dBC (Manufacturer specified) |
| Omnidirectional | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (built-in loop) |
| TWS | Yes |
| Weight | 1.4 lbs (620 g) |
- Links
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