Short answer: the KEF Muo gen2 for cleaner loud playback, the Ultimate Ears Megaboom 4 for ruggedness and USB-C. The Megaboom 4 is IP67 rated, floats and finally uses USB-C charging, but it produces a lot of distortion at higher volumes. The Muo gen2 keeps KEF’s fixed treble and overall balance, though it still lacks deeper bass.
Buy the KEF Muo gen2. It is rated higher for sound quality, and saving $49.99 with the Ultimate Ears Megaboom 4 does not make up for the sound-quality gap.
Want more options? Browse the full Portable Bluetooth rankings.
A stylish waterproof stereo speaker with aptX Adaptive, USB-C audio input, Auracast and long battery life.
A tough waterproof speaker that floats, with USB-C charging, a long battery and PartyUp linking.
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Specifications Side By Side
| KEF Muo gen2 | Ultimate Ears Megaboom 4 | |
|---|---|---|
| Price | $249.99 | $200 |
| Ranked | #96 of 179 in Medium Size Portable Bluetooth Speakers | #173 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Battery Life | 24 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, aptX Adaptive up to 48 kHz 24 bit | SBC |
| IP Rating | IP67 | IP67 |
| Party Mode | Yes (Auracast) | Yes (PartyUp up to 50 speakers) |
| Stereo | Yes | No |
| Omnidirectional | No | Yes |
| TWS | Yes | Yes |
| Digital Aux Input | Yes (USB-C) | No |
| Weight | 1.6 lbs (740 g) | 2.4 lbs (1.1 kg) |
| Bluetooth Version | 5.4 | 5.1 |
| Drivers | 1x 58x117mm racetrack woofer, 1x 20mm tweeter | 2x 50x50mm full-range + 2x 55x86mm passive radiators |
| Dimensions | 8.5” x 3.2” x 2.3” (216 x 82 x 59 mm) | 3.4” x 3.4” x 8.9” (87 x 87 x 225 mm) |
| Frequency Response | 43Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 40W | - |
| Maximum SPL | 90dB (Manufacturer specified) | 91dB (Manufacturer specified) |
| Aux Input | No | No |
| EQ | Yes | Yes (via app) |
| Power Input | USB-C | USB-C |
| Built-in Microphone | - | No |
| Strap | - | Yes (built-in loop) |
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