Short answer: the Harman Kardon Onyx Studio 9. It ranks #15 of 76 boombox speakers by sound quality, rated 4.1/5, at $189.99; the Bumpboxx Flare 8 ranks #58, rated 2.6/5, and costs $400, so there is not much of a tradeoff to weigh.
Why pick the Harman Kardon Onyx Studio 9: 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. 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.
What the Bumpboxx Flare 8 does well: A retro-styled, 8.6kg party speaker with useful real-world features: IPX6 splash resistance, FM radio, USB and microSD playback, aux input, TWS pairing and a claimed 118dB maximum output. Watch for: Bass is thuddy rather than deep or controlled, and there is no app to improve the tuning.
Buy the Harman Kardon Onyx Studio 9. It is rated higher for sound quality than the Bumpboxx Flare 8 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.
Specifications Side By Side
| Harman Kardon Onyx Studio 9 | Bumpboxx Flare 8 | |
|---|---|---|
| Price | $189.99 | $400 |
| Ranked | #15 of 76 in Boombox Size Portable Bluetooth Speakers | #58 of 76 in Boombox Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | 41Hz | - |
| Maximum SPL | 101dB (measured by Alan Ross Reviews) | 118dB (Manufacturer specified) |
| IP Rating | None | IPX6 |
| Power Input | AC Power Cable (2-Prong) | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 9.3 lbs (4.2 kg) | 19 lbs (8.62 kg) |
| App | Yes (Harman Kardon One app) | No |
| Bluetooth Codecs | SBC | SBC |
| EQ | Yes (App EQ) | Yes |
| Party Mode | Yes (Auracast) | No |
| USB Playback | No | Yes |
| Bluetooth Version | 5.3 | - |
| Battery Life | 8 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| Amplifier Power | 50W RMS | 200W |
| Dimensions | 11.4” x 11.3” x 5.1” (289.2 x 287.5 x 130 mm) | 28” x 8” x 16” (711 x 203 x 406 mm) |
| Drivers | 120mm woofer + 3x 20mm tweeters | 8” woofer + tweeters |
| Digital Aux Input | No | No |
| Aux Input | No | Yes |
| Strap | No | - |
| Power Bank | - | No |
| Built-in Microphone | - | No |
| FM Tuner | - | Yes |
| MicroSD Playback | - | Yes |
| Lights | - | Yes |
Related Speaker Comparisons
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- Harman Kardon Onyx Studio 9 vs JBL Partybox Encore Essential 2
Prices on this page were last checked September 26, 2026 at 11:14 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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The Two Speakers In Full
Harman Kardon Onyx Studio 9: $189.99 Amazon eBay
Older models: the Harman Kardon Onyx Studio 8 (rated 4.1/5), the Harman Kardon Onyx Studio 7 (rated 4.1/5), the Harman Kardon Onyx Studio 6 (rated 4.1/5), the Harman Kardon Onyx Studio 5 (rated 3.9/5) and the Harman Kardon Onyx Studio 4 (rated 3.3/5).
Pros: 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. Reviews praise its balanced, smooth presentation and non-fatiguing treble, making it a more music-focused choice than most party speakers. Measured bass extension of 41Hz (-10dB).
Cons: It has no water resistance, aux input or USB playback, and its eight-hour claimed battery life is short for an outdoor portable. Bass is less deep than some earlier Onyx Studio models, while the slightly recessed mids and rolled-off top end mean it is not the most open or detailed option; it still charges from an AC power cable rather than USB-C.
Full Harman Kardon Onyx Studio 9 review and specifications →
| Amplifier Power | 50W RMS |
|---|---|
| App | Yes (Harman Kardon One app) |
| Aux Input | No |
| Bass Extension (-10dB) | 41Hz |
| Battery Life | 8 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| Digital Aux Input | No |
| Dimensions | 11.4” x 11.3” x 5.1” (289.2 x 287.5 x 130 mm) |
| Drivers | 120mm woofer + 3x 20mm tweeters |
| EQ | Yes (App EQ) |
| IP Rating | None |
| Maximum SPL | 101dB (measured by Alan Ross Reviews) |
| Omnidirectional | No |
| Party Mode | Yes (Auracast) |
| Power Input | AC Power Cable (2-Prong) |
| Stereo | Yes |
| Strap | No |
| TWS | Yes |
| USB Playback | No |
| Weight | 9.3 lbs (4.2 kg) |
- Links
- Reviews, Comparisons and Sound Samples
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Bumpboxx Flare 8: $400 Bumpboxx eBay
Pros: A retro-styled, 8.6kg party speaker with useful real-world features: IPX6 splash resistance, FM radio, USB and microSD playback, aux input, TWS pairing and a claimed 118dB maximum output. It can play much louder than compact Bluetooth speakers and is easy to aim at a small outdoor gathering.
Cons: Bass is thuddy rather than deep or controlled, and there is no app to improve the tuning. Owner reports also raise reliability concerns, including noisy or intermittent volume controls and sound cutting out at high volume. It is a fun-looking niche product, not a sound-quality or durability leader.
Full Bumpboxx Flare 8 review and specifications →
| Amplifier Power | 200W |
|---|---|
| App | No |
| Aux Input | Yes |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 28” x 8” x 16” (711 x 203 x 406 mm) |
| Drivers | 8” woofer + tweeters |
| EQ | Yes |
| FM Tuner | Yes |
| IP Rating | IPX6 |
| Lights | Yes |
| Maximum SPL | 118dB (Manufacturer specified) |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 19 lbs (8.62 kg) |
- Links
- Reviews, Comparisons and Sound Samples
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