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 JBL Partybox On the Go ranks #64, rated 3.0/5, and costs $249.95, so there is not much of a tradeoff to weigh.
The Harman Kardon Onyx Studio 9 is the better-sounding, deeper-bass option. 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 49Hz for the JBL Partybox On the Go. At 9.3 lbs (4.2 kg) it weighs much less than the JBL Partybox On the Go at 16.5 lbs (7.5 kg). It links with other speakers (Auracast), which the JBL Partybox On the Go 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 JBL Partybox On the Go is the tougher pick. A wireless microphone is included. It is rated IPX4, while the Harman Kardon Onyx Studio 9 has no water resistance. It keeps a wired aux input, which the Harman Kardon Onyx Studio 9 lacks. Watch for: Battery life is short, and its sound trails the rest of the Partybox line.
Buy the Harman Kardon Onyx Studio 9. It is rated higher for sound quality than the JBL Partybox On the Go and costs less, which makes it the one to get unless you need something the other one does better.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Harman Kardon Onyx Studio 9 | JBL Partybox On the Go | |
|---|---|---|
| Price | $189.99 | $249.95 |
| Ranked | #15 of 98 in Boombox Size Portable Bluetooth Speakers | #64 of 98 in Boombox Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | 41Hz | 49Hz |
| Maximum SPL | 101dB (measured by Alan Ross Reviews) | 94dB (Manufacturer specified) |
| 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 | Yes | Yes |
| 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) |
| Amplifier 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 | No | Yes |
| Strap | No | Yes (detachable shoulder strap) |
| Power Bank | - | Yes (USB-A, 5V/2.1A) |
| Built-in Microphone | - | 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
JBL Partybox On the Go: $249.95 Amazon $249.95 eBay
Newer model: the JBL PartyBox On-The-Go 2 Plus, ranked higher, rated 4.4/5, released Apr 2026. It adds USB audio input, adjustable EQ, party mode and LC3. Battery life goes from 6 to 15 hours. See every JBL PartyBox On-The-Go generation.
Pros: JBL Partybox On the Go uses 5.1” woofer + tweeters. Its 7.5 kg, claimed 6 hours (Manufacturer specified) battery life, IPX4 protection, aux input, up to 94dB and limited-stereo playback make it a practical option for its intended room or portable use. A wireless microphone is included. Measured bass extension of 49Hz (-10dB).
Cons: Bass is limited by its 49Hz specification. No EQ adjustment. Battery life is short, and its sound trails the rest of the Partybox line.
Full JBL Partybox On the Go review and specifications →
| Released | Sep 2020 (6 years ago) |
|---|---|
| Amplifier Power | 100W |
| App | Yes (JBL PartyBox app) |
| Aux Input | Yes |
| Bass Extension (-10dB) | 49Hz |
| Battery Life | 6 hours (Manufacturer specified) |
| Bluetooth | Yes |
| 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 |
| Maximum SPL | 94dB (Manufacturer specified) |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | Yes (USB-A, 5V/2.1A) |
| Power Input | USB-C |
| Stereo | Partially |
| Strap | Yes (detachable shoulder strap) |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 16.5 lbs (7.5 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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