Short answer: the Harman Kardon Luna 2. It ranks #25 of 177 medium speakers by sound quality, rated 4.1/5, at $199.95; the KEF Muo gen2 ranks #96, rated 3.1/5, and costs $249.99, so there is not much of a tradeoff to weigh.
The Harman Kardon Luna 2 is the better-sounding choice. A stylish waterproof speaker with clear, spacious mids, tight bass that stays clean at volume, and stereo pairing with a second unit. Watch for: Treble can sound bright and edgy, and it loses more output off-axis than some rivals.
The KEF Muo gen2 is the longer-running option. A stylish waterproof stereo speaker with aptX Adaptive, USB-C audio input, Auracast and long battery life. It is rated for 24 hours of battery against 12 for the Harman Kardon Luna 2. It supports aptX Adaptive Bluetooth, which the Harman Kardon Luna 2 lacks. It plays in stereo from a single unit, unlike the Harman Kardon Luna 2. The tradeoff: Lacking deeper bass.
Buy the Harman Kardon Luna 2. It is rated higher for sound quality than the KEF Muo gen2 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Want more options? Browse the full Portable Bluetooth rankings.
A stylish waterproof speaker with clear, spacious mids, tight bass that stays clean at volume, and stereo pairing with a second unit.
A stylish waterproof stereo speaker with aptX Adaptive, USB-C audio input, Auracast and long battery life.
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Specifications Side By Side
| Harman Kardon Luna 2 | KEF Muo gen2 | |
|---|---|---|
| Price | $199.95 | $249.99 |
| Ranked | #25 of 177 in Medium Size Portable Bluetooth Speakers | #96 of 177 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | No |
| Battery Life | 12 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC, aptX Adaptive up to 48 kHz 24 bit |
| EQ | Yes (4 presets + custom) | Yes |
| IP Rating | IP67 | IP67 |
| MicroSD Playback | No | - |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| USB Playback | No | - |
| Weight | 1.6 lbs (735 g) | 1.6 lbs (740 g) |
| Bluetooth Version | 5.4 | 5.4 |
| Dimensions | 8.5” x 3.3” x 3.2” (216 x 84 x 81 mm) | 8.5” x 3.2” x 2.3” (216 x 82 x 59 mm) |
| Drivers | 62mm x 82mm woofer with passive radiator, 20mm tweeter | 1x 58x117mm racetrack woofer, 1x 20mm tweeter |
| Frequency Response | 58Hz - 20kHz (-6dB) (Manufacturer specified) | 43Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | 40W (25W woofer + 15W tweeter) | 40W |
| Digital Aux Input | No | Yes (USB-C) |
| Strap | No | - |
| Party Mode | - | Yes (Auracast) |
| Maximum SPL | - | 90dB (Manufacturer specified) |
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