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 Wonderboom 4 ranks #89 of 144 medium speakers by sound quality at $59.99.
What the Bose Soundlink Micro does well: Bose Soundlink Micro uses 40mm with dual passive radiators. The tradeoff: Bass is limited by its 66Hz specification.
Why pick the Ultimate Ears Wonderboom 4: Small size. Watch for: Bass isn’t as deep as the top-ranked speakers and is a little thuddy.
Buy the Bose Soundlink Micro at $83.99 for a small speaker, or the Ultimate Ears Wonderboom 4 at $59.99 for a medium speaker instead.
If battery life is a priority, the Ultimate Ears Wonderboom 4 is rated for 14 hours versus 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 Wonderboom 4 | |
|---|---|---|
| Price | $83.99 | $59.99 |
| Ranked | #19 of 47 in Small Size Portable Bluetooth Speakers | #89 of 144 in Medium Size Portable Bluetooth Speakers |
| App | Yes | No |
| Bass Extension (-10dB) | 66Hz | - |
| Battery Life | 6 hours (Manufacturer specified) | 14 hours (Manufacturer specified) |
| Built-in Microphone | Yes | No |
| EQ | No | No |
| IP Rating | IP67 | IP67 |
| Bluetooth Latency | 50ms | - |
| Maximum SPL | 90dB (measured by Alan Ross Reviews) | 87dB (Manufacturer specified) |
| Party Mode | Yes (Bose Party mode) | No |
| Power Bank | No | No |
| Power Input | Micro USB | USB-C |
| Stereo | No | No |
| Omnidirectional | Pointing up | Yes |
| TWS | Yes | Yes |
| Weight | 0.6 lbs (289 g) | 0.9 lbs (420 g) |
| Aux Input | No | No |
| Bluetooth Codecs | SBC | SBC |
| Bluetooth Version | 4.2 | 5.2 |
| Dimensions | 3.9” x 3.9” x 1.4” (98 x 98 x 35 mm) | 4.1” x 3.8” (104 x 95.3 mm) |
| Drivers | 40mm with dual passive radiators | 2x 40mm active drivers + 2x passive radiators (46.1 x 65.2mm) |
| 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 Wonderboom 4: $59.99 Amazon eBay
Older models: the Ultimate Ears Wonderboom 3 (rated 2.9/5), the Ultimate Ears Wonderboom 2 (rated 2.9/5) and the Ultimate Ears Wonderboom (rated 2.9/5).
Pros: Small size.
Cons: Bass isn’t as deep as the top-ranked speakers and is a little thuddy. Not much improvement over the previous Ultimate Ears Wonderboom 3 besides the USB-C charging port.
Full Ultimate Ears Wonderboom 4 review and specifications →
| App | No |
|---|---|
| Aux Input | No |
| Battery Life | 14 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.2 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 4.1” x 3.8” (104 x 95.3 mm) |
| Drivers | 2x 40mm active drivers + 2x passive radiators (46.1 x 65.2mm) |
| EQ | No |
| IP Rating | IP67 |
| Maximum SPL | 87dB (Manufacturer specified) |
| Omnidirectional | Yes |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | No |
| Strap | Yes (built-in loop) |
| TWS | Yes |
| Weight | 0.9 lbs (420 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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