Short answer: the Harman Kardon Onyx Studio 9. It ranks #13 of 73 boombox speakers by sound quality at $186.99; the JBL Partybox On the Go ranks #44 and costs $300, so there is not much of a tradeoff to weigh.
What the Harman Kardon Onyx Studio 9 offers: Auracast multi-speaker connection alongside classic stereo pairing. Harman Kardon One app with EQ. USB-C charging, up from the previous generation’s AC power brick. Watch for: Slight recessed mids, boost in the upper mids, rolled off upper treble. Not as deep bass as previous Onyx Studio speakers.
What the JBL Partybox On the Go offers: Included wireless microphone. Watch for: Poor water rating. Horrible battery life. Probably the worst sounding of the Partybox line.
Buy the Harman Kardon Onyx Studio 9. It ranks higher for sound quality than the JBL Partybox On the Go and costs less, so the other one has nothing left to offer.
If water resistance matters to you, the JBL Partybox On the Go at IPX4 (splashing) holds up far better than the Harman Kardon Onyx Studio 9 at no water resistance.
Specifications Side By Side
| Harman Kardon Onyx Studio 9 | JBL Partybox On the Go | |
|---|---|---|
| Price | $186.99 | $300 |
| Ranked | #13 of 73 in Boombox Size Portable Bluetooth Speakers | #44 of 73 in Boombox Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | 41Hz | 49Hz |
| Max Volume | 101dB | 94dB |
| IP Rating | None | IPX4 |
| Power Input | AC Power Cable (2-Prong) | USB-C |
| Stereo | Yes | Partially |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 9.3 lbs / 4.2 kg | 16.5 lbs / 7.5 kg |
| App | Yes (Harman Kardon One app) | Yes (JBL PartyBox app) |
| Bluetooth Codecs | SBC | SBC |
| EQ | Yes (App EQ) | No |
| Party Mode | Yes (Auracast) | No |
| USB Playback | No | Yes |
| Bluetooth Version | 5.3 | 4.2 |
| Battery Life | 8 hours (Manufacturer specified) | 6 hours (Manufacturer specified) |
| Output Power | 50W RMS | 100W |
| Dimensions | 11.4" x 11.3" x 5.1" (289.2 x 287.5 x 130 mm) | 19.3" x 8.8" x 9.6" (489 x 224 x 244.5 mm) |
| Drivers | 120mm woofer + 3x 20mm tweeters | 5.1" woofer + tweeters |
| Digital Aux Input | No | No |
| Aux Input | - | Yes |
| Power Bank | - | Yes (USB-A, 5V/2.1A) |
| Built in Microphone | - | No |
Related Speaker Comparisons
A few more comparisons worth a look in the same class:
- Sony SRS-XG500 vs Soundcore Motion Boom+
- Soundcore Rave Party 2 vs Zealot ZE41
- Monster Rockin’ Roller 270 vs Zealot ZE41
- Harman Kardon Onyx Studio 9 vs Tribit Stormbox Blast 2
- Harman Kardon Onyx Studio 9 vs JBL Authentics 300
Prices on this page were last checked August 27, 2026 at 10:09 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: $186.99 Amazon eBay
Pros: Auracast multi-speaker connection alongside classic stereo pairing. Harman Kardon One app with EQ. USB-C charging, up from the previous generation’s AC power brick.
Cons: Slight recessed mids, boost in the upper mids, rolled off upper treble. Not as deep bass as previous Onyx Studio speakers.
Full Harman Kardon Onyx Studio 9 review and specifications →
| App | Yes (Harman Kardon One app) |
|---|---|
| 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 |
| Max Volume | 101dB |
| Omnidirectional | No |
| Output Power | 50W RMS |
| Party Mode | Yes (Auracast) |
| Power Input | AC Power Cable (2-Prong) |
| Stereo | Yes |
| 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 Zealot ZE41
- Harman Kardon Onyx Studio 9 vs Harman Kardon Onyx Studio 7
- Harman Kardon Onyx Studio 9 vs Zealot ZE21
- Harman Kardon Onyx Studio 9 vs Harman Kardon Onyx Studio 6
- Harman Kardon Onyx Studio 9 vs Zealot S89
- Harman Kardon Onyx Studio 9 vs Harman Kardon Onyx Studio 8
- Harman Kardon Onyx Studio 9 vs JBL Boombox 4
- Harman Kardon Onyx Studio 9 vs Vifa Copenhagen 2.0
- See all 56 comparisons
JBL Partybox On the Go: $300 Amazon eBay
Pros: Included wireless microphone.
Cons: Poor water rating. Horrible battery life. Probably the worst sounding of the Partybox line.
Full JBL Partybox On the Go review and specifications →
| App | Yes (JBL PartyBox app) |
|---|---|
| Aux Input | Yes |
| Bass Extension (-10dB) | 49Hz |
| Battery Life | 6 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 4.2 |
| Built in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 19.3" x 8.8" x 9.6" (489 x 224 x 244.5 mm) |
| Drivers | 5.1" woofer + tweeters |
| EQ | No |
| IP Rating | IPX4 |
| Max Volume | 94dB |
| Omnidirectional | No |
| Output Power | 100W |
| Party Mode | No |
| Power Bank | Yes (USB-A, 5V/2.1A) |
| Power Input | USB-C |
| Stereo | Partially |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 16.5 lbs / 7.5 kg |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- JBL Partybox On the Go vs Sony SRS-XG500
- JBL Partybox On the Go vs JBL Boombox
- JBL Partybox On the Go vs Soundcore Rave Party 2
- JBL Partybox On the Go vs Soundcore Motion Boom+
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