Short answer: the Bugani Boost Max for output, the Harman Kardon Onyx Studio 9 for connectivity. The Bugani claims 240W stereo from dual 4-inch woofers and passive bass radiators, though its bass is not as deep as the top ranked speakers. The Onyx Studio 9 adds Auracast multi-speaker connection alongside stereo pairing, but its mids are slightly recessed with an upper-mid boost and rolled-off upper treble.
Buy the Harman Kardon Onyx Studio 9. It is rated higher for sound quality; the Bugani Boost Max is no longer sold new.
There is a real battery-life gap here: the Bugani Boost Max is rated for 15 hours, the Harman Kardon Onyx Studio 9 only 8 hours.
There is a real gap in water resistance: the Bugani Boost Max at IPX6 (powerful water jets) against the Harman Kardon Onyx Studio 9, which has no water resistance.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
A powerful stereo boombox with water resistance, stereo pairing and a built in power bank.
An elegant living room portable with balanced, smooth, non-fatiguing sound, app EQ, and stereo pairing for music lovers.
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Specifications Side By Side
| Bugani Boost Max | Harman Kardon Onyx Studio 9 | |
|---|---|---|
| Price | $299.99 Discontinued | $184.99 |
| Ranked | #63 of 113 in Boombox Size Portable Bluetooth Speakers | #15 of 113 in Boombox Size Portable Bluetooth Speakers |
| Aux Input | Yes | No |
| Battery Life | 15 hours (Manufacturer specified) | 8 hours (Manufacturer specified) |
| IP Rating | IPX6 | None |
| Microphone Input | Yes | - |
| Power Input | USB-C | AC Power Cable (2-Prong) |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| USB Playback | Yes | No |
| Weight | 12.8 lbs (5.8 kg) | 9.3 lbs (4.2 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| App | No | Yes (Harman Kardon One app) |
| EQ | No | Yes (App EQ) |
| Party Mode | No | Yes (Auracast) |
| Power Bank | Yes (USB-C) | - |
| Built-in Microphone | No | - |
| Bluetooth Version | 5.3 | 5.3 |
| Amplifier Power | 240W | 50W RMS |
| Dimensions | 16.9” x 7.9” x 8.3” (430 x 200 x 210 mm) | 11.4” x 11.3” x 5.1” (289.2 x 287.5 x 130 mm) |
| Drivers | 2x 50mm drivers + passive radiators | 120mm woofer + 3x 20mm tweeters |
| Digital Aux Input | No | No |
| Bass Extension (-10dB) | - | 41Hz |
| Maximum SPL | - | 101dB (measured by Alan Ross Reviews) |
| Strap | - | No |
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