Short answer: the Harman Kardon Onyx Studio 9. The Altec Lansing Mix 2.0 is IP67 waterproof and floats, but the notes say it doesn’t compete well with speakers of the same size class. The Onyx Studio 9 adds Auracast multi-speaker connection alongside classic stereo pairing, though it has slightly recessed mids, a boost in the upper mids, and rolled off upper treble.
Buy the Harman Kardon Onyx Studio 9. It is rated higher for sound quality than the Altec Lansing Mix 2.0 and costs less, so only choose the other one for a particular feature it does better.
Battery life favors the Altec Lansing Mix 2.0: rated for 20 hours against 8 hours for the Harman Kardon Onyx Studio 9.
There is a real gap in water resistance: the Altec Lansing Mix 2.0 at IP67 (brief submersion) against the Harman Kardon Onyx Studio 9, which has no water resistance.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
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Specifications Side By Side
| Altec Lansing Mix 2.0 | Harman Kardon Onyx Studio 9 | |
|---|---|---|
| Price | $219.99 | $184.99 |
| Ranked | #95 of 113 in Boombox Size Portable Bluetooth Speakers | #15 of 113 in Boombox Size Portable Bluetooth Speakers |
| Aux Input | No | No |
| Battery Life | 20 hours (Manufacturer specified) | 8 hours (Manufacturer specified) |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| App | Yes | Yes (Harman Kardon One app) |
| EQ | Yes (App EQ) | Yes (App EQ) |
| TWS | Yes | Yes |
| Party Mode | Yes (House Party Mode, up to 50 speakers) | Yes (Auracast) |
| Power Bank | Yes (USB-A) | - |
| USB Playback | No | No |
| Built-in Microphone | Yes | - |
| Power Input | USB-C | AC Power Cable (2-Prong) |
| FM Tuner | No | - |
| IP Rating | IP67 | None |
| Amplifier Power | 50W | 50W RMS |
| Dimensions | 11” x 9.4” x 11” (279.4 x 238.8 x 279.4 mm) | 11.4” x 11.3” x 5.1” (289.2 x 287.5 x 130 mm) |
| Drivers | 2x drivers | 120mm woofer + 3x 20mm tweeters |
| Weight | 5.1 lbs (2.3 kg) | 9.3 lbs (4.2 kg) |
| Digital Aux Input | No | No |
| Bass Extension (-10dB) | - | 41Hz |
| Maximum SPL | - | 101dB (measured by Alan Ross Reviews) |
| Bluetooth Version | - | 5.3 |
| Strap | - | No |
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