Different classes, so treat this as a step-up-or-not question rather than a head-to-head. The Harman Kardon Onyx Studio 9 ranks #15 of 85 boombox speakers by sound quality at $189.99; the Soundboks Rider ranks #26 of 43 party speakers by sound quality at $599.
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 Soundboks Rider does well: At 6.5 kg it is the lightest Soundboks yet, with a carry handle, IP66 dust and water protection, and the same swappable 100Wh battery as the Mix and Soundboks 4, rated for 35 hours at mid volume and 8 hours at maximum. The catch: Its sealed 8in woofer runs out of real bass at high volume: Xander measured the -6 dB point rising to roughly 75 to 85 Hz at maximum, with 40 Hz some 20 dB down, and M1M heard the bass pulled back toward the upper bass above mid volume.
Buy the Harman Kardon Onyx Studio 9 ($189.99) for a boombox speaker; the Soundboks Rider ($599) suits a party speaker instead.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Harman Kardon Onyx Studio 9 | Soundboks Rider | |
|---|---|---|
| Price | $189.99 | $599.00 |
| Ranked | #15 of 85 in Boombox Size Portable Bluetooth Speakers | #26 of 43 in Party Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | 41Hz | - |
| Maximum SPL | 101dB (measured by Alan Ross Reviews) | 113.2dB(C) (measured by M1M Tech Channel) |
| IP Rating | None | IP66 |
| Power Input | AC Power Cable (2-Prong) | USB-C (65W fast charging) |
| Stereo | Yes | No |
| Omnidirectional | No | No |
| TWS | Yes | No |
| Weight | 9.3 lbs (4.2 kg) | 14.3 lbs (6.5 kg) |
| App | Yes (Harman Kardon One app) | Yes (Soundboks) |
| Bluetooth Codecs | SBC | - |
| EQ | Yes (App EQ) | Yes (6-band EQ + Bass+, Indoor and Outdoor profiles) |
| Party Mode | Yes (Auracast) | No (no TeamUp) |
| USB Playback | No | - |
| Bluetooth Version | 5.3 | - |
| Battery Life | 8 hours (Manufacturer specified) | 35 hours (Manufacturer specified) |
| Amplifier Power | 50W RMS | 92W RMS (72W woofer + 20W tweeter) |
| Dimensions | 11.4” x 11.3” x 5.1” (289.2 x 287.5 x 130 mm) | - |
| Drivers | 120mm woofer + 3x 20mm tweeters | 8” woofer (sealed), 1.2” dome tweeter in horn |
| Digital Aux Input | No | No |
| Aux Input | No | Yes |
| Strap | No | No |
| Frequency Response | - | 40Hz - 20kHz (Manufacturer specified) |
| Removable Battery | - | 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
- 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 (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 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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Soundboks Rider: $599.00 Amazon eBay
Pros: At 6.5 kg it is the lightest Soundboks yet, with a carry handle, IP66 dust and water protection, and the same swappable 100Wh battery as the Mix and Soundboks 4, rated for 35 hours at mid volume and 8 hours at maximum. Xander’s measurements found its flat profile genuinely flat, with distortion around 0.2 percent at moderate volume and below 2 percent from 500 Hz to 10 kHz even at full output, and the Indoor profile reaching down to 40 Hz at moderate volume. Both Xander and M1M Tech Channel preferred its punchy, controlled kick bass to the larger Soundboks Mix, and the app adds a six-band EQ with saveable presets.
Cons: Its sealed 8in woofer runs out of real bass at high volume: Xander measured the -6 dB point rising to roughly 75 to 85 Hz at maximum, with 40 Hz some 20 dB down, and M1M heard the bass pulled back toward the upper bass above mid volume. It measured 107 dB(C) outdoors for Xander and 113.2 dB(C) for M1M, about 3 dB below the Soundboks Mix and well short of the claimed 118 dB. There is no TeamUp, so it cannot link with other Soundboks speakers, the strap and charger are sold separately, and Xander found the grille causes dispersion artifacts around 5 kHz and judged the price too high for what it delivers.
Full Soundboks Rider review and specifications →
| Amplifier Power | 92W RMS (72W woofer + 20W tweeter) |
|---|---|
| App | Yes (Soundboks) |
| Aux Input | Yes |
| Battery Life | 35 hours (Manufacturer specified) |
| Digital Aux Input | No |
| Drivers | 8” woofer (sealed), 1.2” dome tweeter in horn |
| EQ | Yes (6-band EQ + Bass+, Indoor and Outdoor profiles) |
| Frequency Response | 40Hz - 20kHz (Manufacturer specified) |
| IP Rating | IP66 |
| Maximum SPL | 113.2dB(C) (measured by M1M Tech Channel) |
| Omnidirectional | No |
| Party Mode | No (no TeamUp) |
| Power Input | USB-C (65W fast charging) |
| Removable Battery | Yes |
| Stereo | No |
| Strap | No |
| TWS | No |
| Weight | 14.3 lbs (6.5 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Soundboks Rider vs Ultimate Ears Hyperboom
- Soundboks Rider vs Soundboks Mix
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