Short answer: the Harman Kardon Onyx Studio 9. It ranks #13 of 73 boombox speakers by sound quality; the Teufel Boomster 2021 ranks #33.
On the Harman Kardon Onyx Studio 9 side: Auracast multi-speaker connection alongside classic stereo pairing. Watch for: Slight recessed mids, boost in the upper mids, rolled off upper treble.
What the Teufel Boomster 2021 gets right: Pretty balanced sound, slightly warm. The tradeoff: Not as deep of bass as above ranked speakers.
One note: the Teufel Boomster 2021 is discontinued, but it still ranks #33 of 73 boombox speakers by sound quality, ahead of most of what is still sold new, so it is worth considering used.
Buy the Harman Kardon Onyx Studio 9 if sound quality matters more than the price. Buy the Teufel Boomster 2021 if the price matters more than sound quality.
If battery life is a priority, the Teufel Boomster 2021 is rated for 18 hours versus 8 hours for the Harman Kardon Onyx Studio 9.
If water resistance matters to you, the Teufel Boomster 2021 at IPX7 (brief submersion) holds up far better than the Harman Kardon Onyx Studio 9 at no water resistance.
Specifications Side By Side
| Harman Kardon Onyx Studio 9 | Teufel Boomster 2021 | |
|---|---|---|
| Price | $186.99 | €250 Discontinued |
| Ranked | #13 of 73 in Boombox Size Portable Bluetooth Speakers | #33 of 73 in Boombox Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | 41Hz | - |
| Max Volume | 101dB | - |
| IP Rating | None | IPX7 |
| 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 | 8.3 lbs / 3.75 kg |
| App | Yes (Harman Kardon One app) | No |
| Bluetooth Codecs | SBC | SBC |
| EQ | Yes (App EQ) | No |
| Party Mode | Yes (Auracast) | No |
| USB Playback | No | No |
| Bluetooth Version | 5.3 | - |
| Battery Life | 8 hours (Manufacturer specified) | 18 hours (Manufacturer specified) |
| Output Power | 50W RMS | 42W RMS |
| Dimensions | 11.4" x 11.3" x 5.1" (289.2 x 287.5 x 130 mm) | 14.6" x 7.1" x 5.8" (370 x 180 x 148 mm) |
| Drivers | 120mm woofer + 3x 20mm tweeters | 1x 110mm (4.3") woofer + 2x 65mm midrange drivers + 2x 20mm tweeters |
| Digital Aux Input | No | No |
| Aux Input | - | Yes |
| FM Tuner | - | Yes |
| Power Bank | - | No |
| Built in Microphone | - | No |
| Discontinued | - | Yes |
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The Two Speakers In Full
Harman Kardon Onyx Studio 9: $186.99 Amazon
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 |
As an eBay Partner, we may be compensated if you make a purchase.
- 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
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- 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
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Teufel Boomster 2021: €250 Discontinued
Pros: Pretty balanced sound, slightly warm
Cons: Not as deep of bass as above ranked speakers. Boosted mid bass compensating for the lack of bass extension. Discontinued.
Full Teufel Boomster 2021 review and specifications →
| App | No |
|---|---|
| Aux Input | Yes |
| Battery Life | 18 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Built in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 14.6" x 7.1" x 5.8" (370 x 180 x 148 mm) |
| Discontinued | Yes |
| Drivers | 1x 110mm (4.3") woofer + 2x 65mm midrange drivers + 2x 20mm tweeters |
| EQ | No |
| FM Tuner | Yes |
| IP Rating | IPX7 |
| Omnidirectional | No |
| Output Power | 42W RMS |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | No |
| Weight | 8.3 lbs / 3.75 kg |
As an eBay Partner, we may be compensated if you make a purchase.
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- Reviews, Comparisons and Sound Samples
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