Short answer: both are discontinued, so this only matters if you are buying used. Used, the Harman Kardon Onyx Studio 8 is the better pick: it ranks #12 of 91 boombox speakers by sound quality (rated 4.1/5), against #46 (rated 3.4/5) for the Teufel Boomster 2021. If you want one new, the Tribit Stormbox Blast ranks #2 at $179.99.
The Harman Kardon Onyx Studio 8 is the better-sounding option. Claimed 8 hours (manufacturer specified) battery life and up to 96db make its feature set practical for its intended room or portable use. It has an adjustable EQ, which the Teufel Boomster 2021 lacks. The catch: Warm tuning with boosted bass, not as loud as others, and no water resistance rating.
The Teufel Boomster 2021 is the longer-running, tougher option. It is rated for 18 hours of battery against 8 for the Harman Kardon Onyx Studio 8. It is rated IPX7, while the Harman Kardon Onyx Studio 8 has no water resistance.
Buy the Harman Kardon Onyx Studio 8 only if you find one used in good condition; both are discontinued, and it is the better rated of the two. For a new speaker, start with the Tribit Stormbox Blast instead.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| Harman Kardon Onyx Studio 8 | Teufel Boomster 2021 | |
|---|---|---|
| Price | $199.00 Discontinued | €250 Discontinued |
| Ranked | #12 of 91 in Boombox Size Portable Bluetooth Speakers | #46 of 91 in Boombox Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Aux Latency | 42ms | - |
| Bass Extension (-10dB) | 35Hz | - |
| Battery Life | 8 hours (Manufacturer specified) | 18 hours (Manufacturer specified) |
| Built-in Microphone | Yes | No |
| IP Rating | None | IPX7 |
| Bluetooth Latency | 175ms | - |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) | - |
| Power Input | DC Barrel Connector (19V/2.1A) | USB-C |
| Stereo | Partially (1 woofer) | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 7.3 lbs (3.3 kg) | 8.3 lbs (3.75 kg) |
| App | Yes (Harman Kardon One app) | No |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Power Bank | No | No |
| EQ | Yes (App EQ) | No |
| Party Mode | No | No |
| USB Playback | No | No |
| Bluetooth Version | 5.2 | 5.0 |
| Amplifier Power | 50W RMS | 42W RMS |
| Dimensions | 10.6” x 11.9” x 6.3” (268 x 302.5 x 159.5 mm) | 14.6” x 7.1” x 5.8” (370 x 180 x 148 mm) |
| Drivers | 120mm woofer + 2x 20mm tweeters | 1x 110mm (4.3”) woofer + 2x 65mm midrange drivers + 2x 20mm tweeters |
| Digital Aux Input | No | No |
| Strap | No | No |
| FM Tuner | - | Yes |
Related Speaker Comparisons
More worthwhile head-to-heads for Harman Kardon Onyx Studio 8:
- Tribit Stormbox Blast vs Harman Kardon Onyx Studio 8
- Harman Kardon Go + Play 3 vs Harman Kardon Onyx Studio 8
- JBL Partybox Encore 2 vs Harman Kardon Onyx Studio 8
- JBL PartyBox On-The-Go 2 Plus vs Harman Kardon Onyx Studio 8
- JBL Partybox Encore Essential 2 vs Harman Kardon Onyx Studio 8
Prices on this page were last checked October 4, 2026 at 9:58 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 8: $199.00 Discontinued Amazon eBay
Newer model: the Harman Kardon Onyx Studio 9, ranked lower, rated 4.1/5.
Pros: At 3.3 kg, Harman Kardon Onyx Studio 8 combines a 120mm woofer and 2x 20mm tweeters with Bluetooth and aux. Claimed 8 hours (manufacturer specified) battery life and up to 96db make its feature set practical for its intended room or portable use. A built-in microphone and the Harman Kardon One app with EQ. Measured bass extension of 35Hz (-10dB).
Cons: Bass is limited by its 35Hz specification. Warm tuning with boosted bass, not as loud as others, and no water resistance rating. Discontinued.
Full Harman Kardon Onyx Studio 8 review and specifications →
| Amplifier Power | 50W RMS |
|---|---|
| App | Yes (Harman Kardon One app) |
| Aux Input | Yes |
| Aux Latency | 42ms |
| Bass Extension (-10dB) | 35Hz |
| Battery Life | 8 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Latency | 175ms |
| Bluetooth Version | 5.2 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 10.6” x 11.9” x 6.3” (268 x 302.5 x 159.5 mm) |
| Drivers | 120mm woofer + 2x 20mm tweeters |
| EQ | Yes (App EQ) |
| IP Rating | None |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | No |
| Power Input | DC Barrel Connector (19V/2.1A) |
| Stereo | Partially (1 woofer) |
| Strap | No |
| TWS | Yes |
| USB Playback | No |
| Weight | 7.3 lbs (3.3 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Alan Ross Reviews: Harman Kardon Onyx Studio 8 review - part 2 of 3 More from alanrossreviews →
- Alan Ross Reviews: Onyx Studio 8 vs HK Onyx 6, Xtreme 3, PartyBox Encore, Go+ Play, Bag of Riddim! part 3 of 3
- Alan Ross Reviews: Dead room vs Live room - Onyx studio 8 self tuning test! part 1 of 3
- Alan Ross Reviews: Ultimate HK Onyx Studio speaker review and comparison! 8 speakers!
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Teufel Boomster 2021: €250 Discontinued eBay
Newer model: the Teufel Boomster 4, ranked higher, rated 3.4/5.
Pros: Teufel Boomster 2021 uses 1x 110mm (4.3”) woofer + 2x 65mm midrange drivers + 2x 20mm tweeters. Its 3.75 kg, claimed 18 hours (Manufacturer specified) battery life, IPX7 protection, aux input and stereo playback make it a practical option for its intended room or portable use.
Cons: There is no companion app. No EQ adjustment. Discontinued.
Full Teufel Boomster 2021 review and specifications →
| Amplifier Power | 42W RMS |
|---|---|
| App | No |
| Aux Input | Yes |
| Battery Life | 18 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.0 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 14.6” x 7.1” x 5.8” (370 x 180 x 148 mm) |
| Drivers | 1x 110mm (4.3”) woofer + 2x 65mm midrange drivers + 2x 20mm tweeters |
| EQ | No |
| FM Tuner | Yes |
| IP Rating | IPX7 |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | No |
| TWS | Yes |
| USB Playback | No |
| Weight | 8.3 lbs (3.75 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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