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 Pioneer PBM5 ranks #89, rated 2.0/5, at $149, $40.99 cheaper, not enough of a saving to outweigh the sound-quality gap.
The case for 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 catch: 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 Pioneer PBM5: Loud for its size: Williston Audio Labs measured about 105 dB at 2 meters, louder than the Turtlebox Original Gen3 and Kicker Bullfrog BF400 in the same test. The tradeoff: Williston Audio Labs was not impressed with its sound: there is very little bass below 100Hz, and the amplifier’s output has a big dip from 1.6kHz to 10kHz that leaves the upper mids and treble recessed.
Buy the Harman Kardon Onyx Studio 9. It is rated higher for sound quality, and the $40.99 saving on the Pioneer PBM5 is not enough to make up the difference.
There is a real battery-life gap here: the Pioneer PBM5 is rated for 13 hours, the Harman Kardon Onyx Studio 9 only 8 hours.
There is a real gap in water resistance: the Pioneer PBM5 at IPX5 (water jets) against the Harman Kardon Onyx Studio 9, which has no water resistance.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Harman Kardon Onyx Studio 9 | Pioneer PBM5 | |
|---|---|---|
| Price | $189.99 | $149.00 |
| Ranked | #15 of 89 in Boombox Size Portable Bluetooth Speakers | #89 of 89 in Boombox Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | 41Hz | - |
| Maximum SPL | 101dB (measured by Alan Ross Reviews) | 105dB at 2m (measured by Williston Audio Labs) |
| IP Rating | None | IPX5 |
| Power Input | AC Power Cable (2-Prong) | USB-C or AC Power cord |
| Stereo | Yes | - |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 9.3 lbs (4.2 kg) | 14.1 lbs (6.4 kg) |
| App | Yes (Harman Kardon One app) | Yes |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | - |
| EQ | Yes (App EQ) | Yes (presets + user EQ) |
| Party Mode | Yes (Auracast) | Yes (Auracast) |
| USB Playback | No | Yes (MP3 only) |
| Bluetooth Version | 5.3 | 5.4 |
| Battery Life | 8 hours (Manufacturer specified) | 13 hours at 60% volume (Manufacturer specified) |
| Amplifier Power | 50W RMS | 300W peak (Manufacturer specified), about 90W measured |
| Dimensions | 11.4” x 11.3” x 5.1” (289.2 x 287.5 x 130 mm) | 8.9”H x 17.4”W x 8.1”D (226 x 442 x 207 mm) |
| Drivers | 120mm woofer + 3x 20mm tweeters | 2x 133mm (5.25”) woofers + 2x 51mm (2”) tweeters |
| Digital Aux Input | No | - |
| Aux Input | No | Yes |
| Strap | No | Yes (detachable shoulder strap) |
| Guitar Input | - | Yes |
| Lights | - | Yes |
| Microphone Input | - | Yes (2 inputs) |
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 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
- Harman Kardon Onyx Studio 9 vs Harman Kardon Onyx Studio 7
- Harman Kardon Onyx Studio 9 vs Zealot ZE51
- Harman Kardon Onyx Studio 9 vs Zealot ZE41
- Harman Kardon Onyx Studio 9 vs Harman Kardon Onyx Studio 6
- Harman Kardon Onyx Studio 9 vs Zealot ZE21
- Harman Kardon Onyx Studio 9 vs Harman Kardon Onyx Studio 8
- Harman Kardon Onyx Studio 9 vs Zealot S89
- Harman Kardon Onyx Studio 9 vs Yeahbox Sonic Boom Ultra
- See all 93 comparisons
Pioneer PBM5: $149.00 Sam’s Club eBay
Pros: Loud for its size: Williston Audio Labs measured about 105 dB at 2 meters, louder than the Turtlebox Original Gen3 and Kicker Bullfrog BF400 in the same test. Two 5.25 inch woofers and two 2 inch tweeters with a port tuned to 48Hz, two microphone inputs plus a guitar input with bass, treble and reverb controls for the mics, aux and USB playback, IPX5 splash resistance, RGB lights, a shoulder strap, Bluetooth 5.4 with Auracast, and charging from either USB-C or the included AC cord. A rated 13 hours at 60% volume.
Cons: Williston Audio Labs was not impressed with its sound: there is very little bass below 100Hz, and the amplifier’s output has a big dip from 1.6kHz to 10kHz that leaves the upper mids and treble recessed. None of the EQ presets fixed it, and a 1990 JVC boombox sounded cleaner. The amp measured about 90W in total, not the claimed 300W, and only about 23W per woofer channel on battery. USB playback is MP3 only, there is no audio output and no microphone in the box, and it is sold only at Sam’s Club.
Full Pioneer PBM5 review and specifications →
| Amplifier Power | 300W peak (Manufacturer specified), about 90W measured |
|---|---|
| App | Yes |
| Aux Input | Yes |
| Battery Life | 13 hours at 60% volume (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Version | 5.4 |
| Dimensions | 8.9”H x 17.4”W x 8.1”D (226 x 442 x 207 mm) |
| Drivers | 2x 133mm (5.25”) woofers + 2x 51mm (2”) tweeters |
| EQ | Yes (presets + user EQ) |
| Guitar Input | Yes |
| IP Rating | IPX5 |
| Lights | Yes |
| Maximum SPL | 105dB at 2m (measured by Williston Audio Labs) |
| Microphone Input | Yes (2 inputs) |
| Omnidirectional | No |
| Party Mode | Yes (Auracast) |
| Power Input | USB-C or AC Power cord |
| Strap | Yes (detachable shoulder strap) |
| TWS | Yes |
| USB Playback | Yes (MP3 only) |
| Weight | 14.1 lbs (6.4 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons