Short answer: the Harman Kardon Onyx Studio 4 for sound quality, the Doss Soundbox XL for features. The Doss offers 32W output, 100dB max volume, a 10-hour battery and a MicroSD slot, but our notes call it a little hollow sounding. The Onyx Studio 4 counters with balanced sound, deep resonant bass and crisp treble, though its battery lasts only 8 hours at medium volume, at $100 against $75.99.
Buy the Doss Soundbox XL if you want one new; the Harman Kardon Onyx Studio 4 is discontinued, so only look for it used.
If water resistance matters to you, the Doss Soundbox XL at IPX4 (splashing) holds up far better than the Harman Kardon Onyx Studio 4 at no water resistance.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Harman Kardon Onyx Studio 4 | Doss Soundbox XL | |
|---|---|---|
| Price | $100 Discontinued | $75.99 |
| Ranked | #58 of 93 in Large Size Portable Bluetooth Speakers | #65 of 93 in Large Size Portable Bluetooth Speakers |
| App | Yes (HK Connect) | No |
| Aux Input | Yes | Yes |
| Battery Life | 8 hours (Manufacturer specified) | 10 hours (Manufacturer specified) |
| EQ | No | No |
| IP Rating | None | IPX4 |
| Party Mode | Yes (Connect+ up to 100 speakers) | No |
| Power Bank | No | No |
| TWS | Yes | Yes |
| Weight | 4.5 lbs (2.06 kg) | 1.2 lbs (557 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Built-in Microphone | Yes | Yes |
| Power Input | DC Barrel Connector (19V/2.1A) | AC Power brick |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| Bluetooth Version | 4.2 | 4.0 |
| Drivers | 2x 75mm woofers + 2x 20mm tweeters + 1x passive radiator | 1x 76mm subwoofer, 2x 50mm fullrange |
| Dimensions | 11.4” x 11.4” x 5.1” (290 x 290 x 130 mm) | 11.8” x 2.6” x 5.2” (300 x 66 x 132 mm) |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) | 40Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | 60W | 32W |
| Digital Aux Input | No | No |
| Strap | No | - |
| Bass Extension (-10dB) | - | 55Hz |
| Maximum SPL | - | 100dB (measured by Alan Ross Reviews) |
| MicroSD Playback | - | Yes |
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Prices on this page were last checked October 2, 2026 at 10:18 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 4: $100 Discontinued eBay
Newer model: the Harman Kardon Onyx Studio 9, rated 4.1/5.
Pros: Balanced sound quality with deep resonant bass and crisp treble, large dynamic range. Multi-host Bluetooth connectivity for 2 phones, daisy chaining up to 100 speakers. Elegant modern design with smooth curves and premium materials.
Cons: 8 hour battery at medium volume. Not at loud as others. Not as deep of bass as the newer Onyx. External AC power brick for charging. Discontinued.
Full Harman Kardon Onyx Studio 4 review and specifications →
| Amplifier Power | 60W |
|---|---|
| App | Yes (HK Connect) |
| Aux Input | Yes |
| Battery Life | 8 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 4.2 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 11.4” x 11.4” x 5.1” (290 x 290 x 130 mm) |
| Drivers | 2x 75mm woofers + 2x 20mm tweeters + 1x passive radiator |
| EQ | No |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) |
| IP Rating | None |
| Omnidirectional | No |
| Party Mode | Yes (Connect+ up to 100 speakers) |
| Power Bank | No |
| Power Input | DC Barrel Connector (19V/2.1A) |
| Stereo | Yes |
| Strap | No |
| TWS | Yes |
| Weight | 4.5 lbs (2.06 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Harman Kardon Onyx Studio 4 vs Zealot S97
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- Harman Kardon Onyx Studio 4 vs JBL Xtreme 2
- Harman Kardon Onyx Studio 4 vs JBL Xtreme
- Harman Kardon Onyx Studio 4 vs W-King D8
- Harman Kardon Onyx Studio 4 vs Sony SRS-XB43
- Harman Kardon Onyx Studio 4 vs Klipsch Detroit
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- See all 38 comparisons
Doss Soundbox XL: $75.99 Amazon eBay
Pros: 32W output power, 100dB max volume, 10-hour battery life, IPX4 splashproof, MicroSD card slot, dual woofer setup with subwoofer, built-in microphone, TWS pairing support. Measured bass extension of 55Hz (-10dB).
Cons: A little hollow sounding.
Full Doss Soundbox XL review and specifications →
| Amplifier Power | 32W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 55Hz |
| Battery Life | 10 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 4.0 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 11.8” x 2.6” x 5.2” (300 x 66 x 132 mm) |
| Drivers | 1x 76mm subwoofer, 2x 50mm fullrange |
| EQ | No |
| Frequency Response | 40Hz - 20kHz (Manufacturer specified) |
| IP Rating | IPX4 |
| Maximum SPL | 100dB (measured by Alan Ross Reviews) |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | No |
| Power Input | AC Power brick |
| Stereo | Yes |
| TWS | Yes |
| Weight | 1.2 lbs (557 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Doss Soundbox XL vs Klipsch Detroit
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- See all 31 comparisons