Short answer: the B&O Beosound A1 2nd gen is the safer compact outdoor speaker, while the KEF Muo gen2 offers stereo and a longer claimed battery. Both have IP67 protection, but the A1 is the louder model at 93dB and has a straightforward 58Hz bass limit rather than the KEF’s ambitious but less convincing low-end claim.
KEF improved the Muo’s treble balance and provides a racetrack woofer plus dedicated tweeter, but its review flags thuddy bass that distorts as volume rises and loses depth off-axis. The A1 is mono and its 18-hour battery trails KEF’s 24-hour claim, but it is the less compromised choice for consistent portable sound.
Buy the B&O Beosound A1 2nd gen for higher output and a more predictable compact-speaker balance.
Buy the KEF Muo gen2 for true stereo, longer battery life, and a larger-driver presentation at moderate volume.
Want more options? Browse the full Portable Bluetooth rankings.
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Specifications Side By Side
| B&O Beosound A1 2nd gen | KEF Muo gen2 | |
|---|---|---|
| Price | $395.00 | $249.99 |
| Ranked | #11 of 179 in Medium Size Portable Bluetooth Speakers | #96 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | No |
| Bass Extension (-10dB) | 58Hz | - |
| Battery Life | 18 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Built-in Microphone | Yes | - |
| EQ | Yes | Yes |
| IP Rating | IP67 | IP67 |
| Bluetooth Latency | 90ms | - |
| Maximum SPL | 93dB (measured by Alan Ross Reviews) | 90dB (Manufacturer specified) |
| Power Bank | No | - |
| Stereo | No | Yes |
| Omnidirectional | Pointing up | No |
| TWS | Yes | Yes |
| Digital Aux Input | Yes (USB-C) | Yes (USB-C) |
| Weight | 1.2 lbs (558 g) | 1.6 lbs (740 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC, aptX Adaptive | SBC, aptX Adaptive up to 48 kHz 24 bit |
| Power Input | USB-C | USB-C |
| Drivers | 3.5mm aluminium driver + 0.75 inch silk dome tweeter | 1x 58x117mm racetrack woofer, 1x 20mm tweeter |
| Dimensions | 5.2”W x 5.2”D x 1.8”H (133 x 133 x 46 mm) | 8.5” x 3.2” x 2.3” (216 x 82 x 59 mm) |
| Amplifier Power | 60W total (2x 30W Class D) | 40W |
| Bluetooth Version | 5.1 | 5.4 |
| Strap | Yes (built-in strap) | - |
| Party Mode | - | Yes (Auracast) |
| Frequency Response | - | 43Hz - 20kHz (Manufacturer specified) |
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