Short answer: the Harman Kardon Onyx Studio 9. It ranks #15 of 89 boombox speakers by sound quality, rated 4.1/5, at $189.99; the Hopestar A90 ranks #22, rated 3.9/5, and costs $351.65, which makes this an easy call rather than a real tradeoff.
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.
The case for the Hopestar A90: A huge, powerful 700W boombox with eight drivers (two 5” woofers, two 3.5” midranges and four tweeters), a removable 36,000mAh battery and a wireless microphone. The tradeoff: The JBL PartyBox Encore Essential 2 was the better, more refined listen in a direct comparison.
Buy the Harman Kardon Onyx Studio 9. It is rated higher for sound quality than the Hopestar A90 and costs less, so only choose the other one for a particular feature it does better.
Water resistance is not close: the Hopestar A90 is rated at IPX6 (powerful water jets), well ahead of the Harman Kardon Onyx Studio 9 at no water resistance.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| Harman Kardon Onyx Studio 9 | Hopestar A90 | |
|---|---|---|
| Price | $189.99 | $351.65 |
| Ranked | #15 of 89 in Boombox Size Portable Bluetooth Speakers | #22 of 89 in Boombox Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | 41Hz | - |
| Maximum SPL | 101dB (measured by Alan Ross Reviews) | - |
| IP Rating | None | IPX6 |
| Power Input | AC Power Cable (2-Prong) | - |
| Stereo | Yes | - |
| Omnidirectional | No | No |
| TWS | Yes | - |
| Weight | 9.3 lbs (4.2 kg) | - |
| App | Yes (Harman Kardon One app) | No |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | - |
| EQ | Yes (App EQ) | No |
| Party Mode | Yes (Auracast) | Yes (Auracast) |
| USB Playback | No | Yes |
| Bluetooth Version | 5.3 | 5.4 |
| Battery Life | 8 hours (Manufacturer specified) | 6-8 hours (Manufacturer specified) |
| Amplifier Power | 50W RMS | 700W |
| Dimensions | 11.4” x 11.3” x 5.1” (289.2 x 287.5 x 130 mm) | 24.6” x 9.9” x 13.4” (624.5 x 252.5 x 341.5 mm) |
| Drivers | 120mm woofer + 3x 20mm tweeters | 2x 5” woofers + 2x 3.5” midranges + 2x 2.5” tweeters + 2x 2” ceramic tweeters |
| Digital Aux Input | No | - |
| Aux Input | No | Yes |
| Strap | No | - |
| Removable Battery | - | Yes |
| Frequency Response | - | 50Hz - 20kHz (Manufacturer specified) |
| MicroSD Playback | - | Yes |
| Wireless Microphones | - | Yes 1 Included |
| Lights | - | Yes |
Related Speaker Comparisons
More worthwhile head-to-heads for Harman Kardon Onyx Studio 9:
- Earfun Uboom X vs Harman Kardon Onyx Studio 9
- Harman Kardon Onyx Studio 9 vs Tribit Stormbox Blast
- Harman Kardon Go + Play 3 vs Harman Kardon Onyx Studio 9
- JBL Partybox Encore 2 vs Harman Kardon Onyx Studio 9
- JBL PartyBox On-The-Go 2 Plus vs Harman Kardon Onyx Studio 9
Prices on this page were last checked September 30, 2026 at 2:57 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 (ranked higher, rated 4.1/5), the Harman Kardon Onyx Studio 7 (ranked higher, rated 4.1/5), the Harman Kardon Onyx Studio 6 (ranked higher, rated 4.1/5), the Harman Kardon Onyx Studio 5 (ranked lower, 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 | Yes |
| 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
- Head-to-Head Comparisons
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Hopestar A90: $351.65 AliExpress eBay
Pros: A huge, powerful 700W boombox with eight drivers (two 5” woofers, two 3.5” midranges and four tweeters), a removable 36,000mAh battery and a wireless microphone. In side by side tests it had better highs, clarity and soundstage than the Zealot ZE21 while still reaching deep, reviewers picked it over the JBL Boombox 4 for its bass and output, and it sounded powerful and true to the music against the JBL PartyBox Encore Essential 2. Bluetooth 5.4 with Auracast, IPX6, USB, TF and aux inputs, RGB lights and a strap attachment.
Cons: The JBL PartyBox Encore Essential 2 was the better, more refined listen in a direct comparison. The Yeahbox Sonic Boom Ultra measured roughly 3 to 5dB louder. There is no app or EQ. It is very large and heavy (13.2 kg boxed), claims only 6 to 8 hours of battery, and it is sold through AliExpress rather than US retailers.
Full Hopestar A90 review and specifications →
| Amplifier Power | 700W |
|---|---|
| App | No |
| Aux Input | Yes |
| Battery Life | 6-8 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Version | 5.4 |
| Dimensions | 24.6” x 9.9” x 13.4” (624.5 x 252.5 x 341.5 mm) |
| Drivers | 2x 5” woofers + 2x 3.5” midranges + 2x 2.5” tweeters + 2x 2” ceramic tweeters |
| EQ | No |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) |
| IP Rating | IPX6 |
| Lights | Yes |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Party Mode | Yes (Auracast) |
| Removable Battery | Yes |
| USB Playback | Yes |
| Wireless Microphones | Yes 1 Included |
- Reviews, Comparisons and Sound Samples
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