Short answer: the Xiaomi Sound Party. It ranks #20 of 177 medium speakers by sound quality, rated 4.1/5, at $149.99; the Ultimate Ears Megaboom 4 ranks #171, rated 2.1/5, and costs $200, so there is not much of a tradeoff to weigh.
The Xiaomi Sound Party is the better-sounding, longer-running pick. A versatile outdoor speaker with warm, balanced sound, fully waterproof build, long battery life, a phone charging port and a handy retractable handle. It is rated for 26 hours of battery against 20 for the Ultimate Ears Megaboom 4. The catch: The sound evidence is mixed rather than universally glowing.
Why pick the Ultimate Ears Megaboom 4: A tough waterproof speaker that floats, with USB-C charging, a long battery and PartyUp linking. Watch for: A lot of distortion at higher volumes.
Buy the Xiaomi Sound Party. It is rated higher for sound quality than the Ultimate Ears Megaboom 4 and costs less, so only choose the other one for a particular feature it does better.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
A versatile outdoor speaker with warm, balanced sound, fully waterproof build, long battery life, a phone charging port and a handy retractable handle.
A tough waterproof speaker that floats, with USB-C charging, a long battery and PartyUp linking.
Prices on this page were last checked October 31, 2026 at 7:11 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
| Xiaomi Sound Party | Ultimate Ears Megaboom 4 | |
|---|---|---|
| Price | $149.99 | $200 |
| Ranked | #20 of 177 in Medium Size Portable Bluetooth Speakers | #171 of 177 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | No |
| Bass Extension (-10dB) | 54Hz | - |
| Battery Life | 26 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| Built-in Microphone | Yes | No |
| EQ | Yes | Yes (via app) |
| IP Rating | IP67 | IP67 |
| Party Mode | Yes (Party Connect, up to 100 speakers) | Yes (PartyUp up to 50 speakers) |
| Power Bank | Yes (USB-C, 5V/3A) | - |
| Stereo | No | No |
| Omnidirectional | No | Yes |
| TWS | Yes | Yes |
| Digital Aux Input | No | No |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Bluetooth Version | 5.4 | 5.1 |
| Dimensions | 10” x 3.6” x 3.6” (255 x 92 x 92 mm) | 3.4” x 3.4” x 8.9” (87 x 87 x 225 mm) |
| Drivers | 2x 40mm woofers (35W total) + 2x 15mm tweeters | 2x 50x50mm full-range + 2x 55x86mm passive radiators |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) | - |
| Maximum SPL | 102dB (measured by Alan Ross Reviews) | 91dB (Manufacturer specified) |
| Weight | 2.6 lbs (1200 g) | 2.4 lbs (1.1 kg) |
| Amplifier Power | 50W | - |
| Power Input | USB-C (5V/3A, 9V/2A, 12V/2A) | USB-C |
| Lights | Yes | - |
| Strap | Yes (detachable strap) | Yes (built-in loop) |
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