These are not really the same size class, and that is the honest framing here. The Tribit Stormbox Micro 2 ranks #1 of 62 small speakers by sound quality at $35.39; the Ultimate Ears Boom 4 ranks #113 of 179 medium speakers by sound quality at $114.99.
The Tribit Stormbox Micro 2 is the lighter choice. An excellent sounding small speaker, with surprisingly deep bass for its size and a strap that holds it on a bike or backpack. At 0.7 lbs (317 g) it weighs much less than the Ultimate Ears Boom 4 at 1.4 lbs (620 g). Watch for: Finicky phone charging, which doesn’t usually work.
The case for the Ultimate Ears Boom 4: A tough waterproof speaker that floats, with USB-C charging, app EQ and pairing with other UE speakers. It plays in stereo from a single unit, unlike the Tribit Stormbox Micro 2. The tradeoff: Not much improvement over the old ones.
Buy the Tribit Stormbox Micro 2 ($35.39) for a small speaker; the Ultimate Ears Boom 4 ($114.99) suits 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
| Tribit Stormbox Micro 2 | Ultimate Ears Boom 4 | |
|---|---|---|
| Price | $35.39 | $114.99 |
| Ranked | #1 of 62 in Small Size Portable Bluetooth Speakers | #113 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | No |
| Bass Extension (-10dB) | 65Hz | - |
| Battery Life | 12 hours (Manufacturer specified) | 15 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Built-in Microphone | Yes | No |
| EQ | Yes (9 Band) | Yes (via app) |
| IP Rating | IP67 | IP67 |
| Bluetooth Latency | 265ms | - |
| Maximum SPL | 94dB (measured by Alan Ross Reviews) | 85dBC (Manufacturer specified) |
| Party Mode | No | - |
| Power Bank | Yes (but it doesn’t usually work; USB-C, 10W) | No |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | Pointing up | No |
| TWS | Yes | Yes |
| Weight | 0.7 lbs (317 g) | 1.4 lbs (620 g) |
| Bluetooth Version | 5.3 | 5.1 |
| Amplifier Power | 10W | - |
| Dimensions | 3.9” x 3.9” x 1.7” (99.1 x 99.1 x 42.7 mm) | 7.2” x 2.9” x 2.9” (184 x 73 x 73 mm) |
| Drivers | 48mm NdFeB driver | 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) |
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