Short answer: the Harman Kardon Onyx Studio 9. It ranks #15 of 98 boombox speakers by sound quality, rated 4.1/5, at $189.99. The W-King X10 ranks #86, rated 2.3/5, at $80, $109.99 cheaper, not enough of a saving to outweigh the sound-quality gap.
The Harman Kardon Onyx Studio 9 is the better-sounding, deeper-bass pick. 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. Its bass reaches about 41Hz before falling 10dB, against 52Hz for the W-King X10. It links with other speakers (Auracast), which the W-King X10 cannot. Watch for: It has no water resistance, aux input or USB playback, and its eight-hour claimed battery life is short for an outdoor portable.
The W-King X10 is the louder, longer-running option. Alan Ross Reviews measured it at 106dB at full volume, against 101dB for the Harman Kardon Onyx Studio 9. It is rated for 42 hours of battery against 8 for the Harman Kardon Onyx Studio 9. At 6.5 lbs (2.95 kg) it weighs noticeably less than the Harman Kardon Onyx Studio 9 at 9.3 lbs (4.2 kg). Watch for: Heavily rolled off treble, less bass than the top ranked.
Buy the Harman Kardon Onyx Studio 9. It is rated higher for sound quality, and the $109.99 you would save on the W-King X10 does not close the gap.
There is a real gap in water resistance: the W-King X10 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.
Specifications Side By Side
| Harman Kardon Onyx Studio 9 | W-King X10 | |
|---|---|---|
| Price | $189.99 | $80 |
| Ranked | #15 of 98 in Boombox Size Portable Bluetooth Speakers | #86 of 98 in Boombox Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | 41Hz | 52Hz |
| Maximum SPL | 101dB (measured by Alan Ross Reviews) | 106dB (measured by Alan Ross Reviews) |
| 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) | 6.5 lbs (2.95 kg) |
| App | Yes (Harman Kardon One app) | No |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| EQ | Yes (App EQ) | Yes (2 modes - Indoor/Outdoor) |
| Party Mode | Yes (Auracast) | No |
| USB Playback | No | Yes |
| Bluetooth Version | 5.3 | 5.0 |
| Battery Life | 8 hours (Manufacturer specified) | 42 hours (Manufacturer specified) |
| Amplifier Power | 50W RMS | 70W RMS (120W peak) |
| Dimensions | 11.4” x 11.3” x 5.1” (289.2 x 287.5 x 130 mm) | 12.4” x 5.5” x 5.3” (315 x 140 x 135 mm) |
| Drivers | 120mm woofer + 3x 20mm tweeters | 2x 3.66” (93mm) subwoofers + 2x 1.2” (31mm) neodymium tweeters + 3x passive radiators |
| Digital Aux Input | No | No |
| Aux Input | No | Yes |
| Strap | No | Yes (detachable shoulder strap) |
| MicroSD Playback | - | Yes |
| Power Bank | - | Yes (USB-A) |
| Built-in Microphone | - | Yes |
| FM Tuner | - | No |
Related Speaker Comparisons
How Harman Kardon Onyx Studio 9 compares with other leading options:
- 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 October 12, 2026 at 4:13 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 $189.99 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). See every Harman Kardon Onyx Studio generation.
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 →
| Released | Dec 2024 (1 year ago) |
|---|---|
| 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
- Harman Kardon Onyx Studio 9 vs Harman Kardon Onyx Studio 7
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- See all 99 comparisons
W-King X10: $80 Amazon $80 AliExpress $80.37 eBay
Pros: 70W RMS output with 120W peak power, exceptional 42-hour battery life, power bank function, IPX6 waterproof, 106dB max volume, EQ with indoor/outdoor modes, dual woofers with tweeters and passive radiators, Bluetooth 5.0 with 100ft range, MicroSD and USB playback, AUX input, TWS stereo pairing. Measured bass extension of 52Hz (-10dB).
Cons: Heavily rolled off treble, less bass than the top ranked.
Full W-King X10 review and specifications →
| Released | May 2021 (5 years ago) |
|---|---|
| Amplifier Power | 70W RMS (120W peak) |
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 52Hz |
| Battery Life | 42 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.0 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 12.4” x 5.5” x 5.3” (315 x 140 x 135 mm) |
| Drivers | 2x 3.66” (93mm) subwoofers + 2x 1.2” (31mm) neodymium tweeters + 3x passive radiators |
| EQ | Yes (2 modes - Indoor/Outdoor) |
| FM Tuner | No |
| IP Rating | IPX6 |
| Maximum SPL | 106dB (measured by Alan Ross Reviews) |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | Yes (USB-A) |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (detachable shoulder strap) |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 6.5 lbs (2.95 kg) |
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- Reviews, Comparisons and Sound Samples
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