These sit in different size classes, so this is not a straight ranking comparison. The Harman Kardon Luna 2 ranks #25 of 173 medium speakers by sound quality at $199.95; the Harman Kardon Onyx Studio 9 ranks #15 of 105 boombox speakers by sound quality at $179.99.
The Harman Kardon Luna 2 is the longer-running, lighter choice. Articulate, spacious midrange with precise imaging and instrument separation. It is rated for 12 hours of battery against 8 for the Harman Kardon Onyx Studio 9. At 1.6 lbs (735 g) it weighs much less than the Harman Kardon Onyx Studio 9 at 9.3 lbs (4.2 kg). It is rated IP67, while the Harman Kardon Onyx Studio 9 has no water resistance. The tradeoff: Treble can sound bright and edgy, and it loses more output off-axis than some rivals.
The case for the Harman Kardon Onyx Studio 9: An elegant 9.3 lbs (4.2 kg) living-room portable with a measured 41Hz -10dB bass point, 101dB maximum level, three tweeters, app EQ, stereo pairing and Auracast multi-speaker linking. It plays in stereo from a single unit, unlike the Harman Kardon Luna 2. The tradeoff: It has no water resistance, aux input or USB playback, and its eight-hour claimed battery life is short for an outdoor portable.
Buy the Harman Kardon Luna 2 ($199.95) for a medium speaker; the Harman Kardon Onyx Studio 9 ($179.99) suits a boombox speaker instead.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Articulate, spacious midrange with precise imaging and instrument separation.
Amazon $199.95 B&H Photo Video $199.95 eBay
An elegant 4.2kg living-room portable with a measured 41Hz -10dB bass point, 101dB maximum level, three tweeters, app EQ, stereo pairing and Auracast multi-speaker linking.
Amazon $179.99 eBayPrices on this page were last checked October 19, 2026 at 10:32 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 | Harman Kardon Onyx Studio 9 | |
|---|---|---|
| Price | $199.95 | $179.99 |
| Ranked | #25 of 173 in Medium Size Portable Bluetooth Speakers | #15 of 105 in Boombox Size Portable Bluetooth Speakers |
| App | Yes | Yes (Harman Kardon One app) |
| Aux Input | No | No |
| Battery Life | 12 hours (Manufacturer specified) | 8 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| EQ | Yes (4 presets + custom) | Yes (App EQ) |
| IP Rating | IP67 | None |
| MicroSD Playback | No | - |
| Power Input | USB-C | AC Power Cable (2-Prong) |
| Stereo | No | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| USB Playback | No | No |
| Weight | 1.6 lbs (735 g) | 9.3 lbs (4.2 kg) |
| Bluetooth Version | 5.4 | 5.3 |
| Dimensions | 8.5” x 3.3” x 3.2” (216 x 84 x 81 mm) | 11.4” x 11.3” x 5.1” (289.2 x 287.5 x 130 mm) |
| Drivers | 62mm x 82mm woofer with passive radiator, 20mm tweeter | 120mm woofer + 3x 20mm tweeters |
| Frequency Response | 58Hz - 20kHz (-6dB) (Manufacturer specified) | - |
| Amplifier Power | 40W (25W woofer + 15W tweeter) | 50W RMS |
| Digital Aux Input | No | No |
| Strap | No | No |
| Bass Extension (-10dB) | - | 41Hz |
| Maximum SPL | - | 101dB (measured by Alan Ross Reviews) |
| Party Mode | - | Yes (Auracast) |
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