These are not really the same size class, and that is the honest framing here. The Bose Soundlink Micro 2 ranks #18 of 47 small speakers by sound quality at $129; the Ultimate Ears Boom 4 ranks #93 of 144 medium speakers by sound quality at $119.99.
Why pick the Bose Soundlink Micro 2: IP67 rated, survives a 1m dunk for 30 minutes. The tradeoff: Lack of clarity.
The case for the Ultimate Ears Boom 4: IP67 rated, floats, and finally charges via USB-C instead of the older Booms’ Micro-USB. The catch: Not much improvement over the old ones.
Buy the Bose Soundlink Micro 2 at $129 for a small speaker, or the Ultimate Ears Boom 4 at $119.99 for a medium speaker instead.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| Bose Soundlink Micro 2 | Ultimate Ears Boom 4 | |
|---|---|---|
| Price | $129.00 | $119.99 |
| Ranked | #18 of 47 in Small Size Portable Bluetooth Speakers | #93 of 144 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Battery Life | 12 hours (Manufacturer specified) | 15 hours (Manufacturer specified) |
| Built-in Microphone | No | No |
| EQ | Yes | Yes (via app) |
| IP Rating | IP67 | IP67 |
| Party Mode | Yes (Bose Party mode) | - |
| Power Bank | No | No |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | Pointing up | No |
| TWS | Yes | Yes |
| Weight | 0.7 lbs (329 g) | 1.4 lbs (620 g) |
| Aux Input | No | No |
| Bluetooth Codecs | AAC, aptX, SBC | SBC |
| Bluetooth Version | 5.4 | 5.1 |
| Dimensions | 4.1” x 4.1” x 1.7” (104 x 104 x 43 mm) | 7.2” x 2.9” x 2.9” (184 x 73 x 73 mm) |
| Charging Time | 3 hours | - |
| Drivers | 40mm full-range driver with passive radiator | 2x 1.57” (40mm) active drivers + 2x 1.81” x 2.57” (46.1 x 65.2mm) passive radiators |
| Digital Aux Input | No | No |
| Strap | Yes (built-in strap) | Yes (built-in loop) |
| Maximum SPL | - | 85dBC (Manufacturer specified) |
Related Speaker Comparisons
More worthwhile head-to-heads for Bose Soundlink Micro 2:
- Tribit Stormbox Micro 2 vs Bose Soundlink Micro 2
- Soundcore Boom Go 3i vs Bose Soundlink Micro 2
- Minirig Mini 2 vs Bose Soundlink Micro 2
- Tribit Stormbox Micro vs Bose Soundlink Micro 2
- Bose Soundlink Micro 2 vs Tribit Stormbox Micro 3
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 2: $129.00 Amazon eBay
Older model: the Bose Soundlink Micro (rated 3.5/5).
Pros: IP67 rated, survives a 1m dunk for 30 minutes. Compact fabric strap for clipping to bags/bikes - replaces the 1st-gen’s hook clip, which was prone to breaking. USB-C charging. Surprisingly good bass when mounted outdoors, like on a bike.
Cons: Lack of clarity. Overly boosted bass that causes some thudding, and can overdrive/distort at higher volumes - worse in this regard than the 1st-gen model. Overly boosted treble, turn down bass and treble in the EQ. Falls clearly behind the Tribit Stormbox Micro 2 on bass depth, cleanliness, and loudness.
Full Bose Soundlink Micro 2 review and specifications →
| App | Yes |
|---|---|
| Aux Input | No |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth Codecs | AAC, aptX, SBC |
| Bluetooth Version | 5.4 |
| Built-in Microphone | No |
| Charging Time | 3 hours |
| Digital Aux Input | No |
| Dimensions | 4.1” x 4.1” x 1.7” (104 x 104 x 43 mm) |
| Drivers | 40mm full-range driver with passive radiator |
| EQ | Yes |
| IP Rating | IP67 |
| Omnidirectional | Pointing up |
| Party Mode | Yes (Bose Party mode) |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | No |
| Strap | Yes (built-in strap) |
| TWS | Yes |
| Weight | 0.7 lbs (329 g) |
- Links
- Reviews, Comparisons and Sound Samples
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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
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Ultimate Ears Boom 4 vs Ultimate Ears Boom 3
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