Short answer: the Harman Kardon Luna 2 if sound quality matters most, the Xiaomi Sound Outdoor if price matters most. The Harman Kardon Luna 2 ranks #25 of 177 medium speakers, rated 4.1/5, at $199.95. The Xiaomi Sound Outdoor ranks #46, rated 3.7/5, at $49.99, $149.96 cheaper.
The Harman Kardon Luna 2 is the better-sounding pick. A stylish waterproof speaker with clear, spacious mids, tight bass that stays clean at volume, and stereo pairing with a second unit. It has an adjustable EQ, which the Xiaomi Sound Outdoor lacks. The catch: Treble can sound bright and edgy, and it loses more output off-axis than some rivals.
What the Xiaomi Sound Outdoor does well: An affordable waterproof outdoor speaker with a separate tweeter, decent battery life and linking to many more speakers. The catch: Bass reach is limited for the cabinet size, with a rated lower limit of 60Hz, and the boosted bass gets somewhat uncontrolled at high levels.
Buy the Harman Kardon Luna 2 if sound quality matters more than the price. Buy the Xiaomi Sound Outdoor if the price matters more than sound quality.
Looking for alternatives? See the complete 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.
An affordable waterproof outdoor speaker with a separate tweeter, decent battery life and linking to many more speakers.
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
| Harman Kardon Luna 2 | Xiaomi Sound Outdoor | |
|---|---|---|
| Price | $199.95 | $49.99 |
| Ranked | #25 of 177 in Medium Size Portable Bluetooth Speakers | #46 of 177 in Medium Size Portable Bluetooth Speakers |
| App | Yes | No |
| Aux Input | No | No |
| Battery Life | 12 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC (inferred; additional codecs unverified) |
| EQ | Yes (4 presets + custom) | No |
| IP Rating | IP67 | IP67 |
| MicroSD Playback | No | - |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| USB Playback | No | - |
| Weight | 1.6 lbs (735 g) | 1.3 lbs (597 g) |
| Bluetooth Version | 5.4 | 5.4 |
| Dimensions | 8.5” x 3.3” x 3.2” (216 x 84 x 81 mm) | 7.7” x 2.7” x 2.6” (196.6 x 68 x 66 mm) |
| Drivers | 62mm x 82mm woofer with passive radiator, 20mm tweeter | 20W woofer, 10W tweeter + 2x passive radiators |
| Frequency Response | 58Hz - 20kHz (-6dB) (Manufacturer specified) | 60Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | 40W (25W woofer + 15W tweeter) | 30W |
| Digital Aux Input | No | No |
| Strap | No | - |
| Built-in Microphone | - | Yes |
| Party Mode | - | Yes (Speakersync, up to 100 speakers) |
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