Short answer: the Ultimate Ears Everboom. It ranks #35 of 97 large speakers by sound quality (rated 3.9/5) at $149.99 and is still sold new; the Harman Kardon Onyx Studio 4 ranks #61 (rated 3.3/5) and is discontinued, so it is only an option used.
On the Ultimate Ears Everboom side: This speaker may move around as we get better sound samples. The tradeoff: Has an upper bass boost and is tuned warm with rolled off treble. Not very deep bass.
Buy the Ultimate Ears Everboom. It is rated higher for sound quality, and the Harman Kardon Onyx Studio 4 is discontinued, so it is only available used.
Battery life favors the Ultimate Ears Everboom: rated for 20 hours against 8 hours for the Harman Kardon Onyx Studio 4.
There is a real gap in water resistance: the Ultimate Ears Everboom at IP67 (brief submersion) against the Harman Kardon Onyx Studio 4, which has no water resistance.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Ultimate Ears Everboom | Harman Kardon Onyx Studio 4 | |
|---|---|---|
| Price | $149.99 | $100 Discontinued |
| Ranked | #35 of 97 in Large Size Portable Bluetooth Speakers | #61 of 97 in Large Size Portable Bluetooth Speakers |
| App | Yes | Yes (HK Connect) |
| Battery Life | 20 hours (Manufacturer specified) | 8 hours (Manufacturer specified) |
| EQ | Yes | No |
| IP Rating | IP67 | None |
| Party Mode | Yes (PartyUp up to 50 speakers) | Yes (Connect+ up to 100 speakers) |
| Power Bank | No | No |
| Power Input | USB-C | DC Barrel Connector (19V/2.1A) |
| Stereo | No | Yes |
| Omnidirectional | Yes | No |
| TWS | No | Yes |
| Weight | 2.1 lbs (949 g) | 4.5 lbs (2.06 kg) |
| Aux Input | Yes | Yes |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Built-in Microphone | Yes | Yes |
| Bluetooth Version | 5.1 | 4.2 |
| Dimensions | 8.1” x 3.3” x 4.3” (205 x 85 x 110 mm) | 11.4” x 11.4” x 5.1” (290 x 290 x 130 mm) |
| Drivers | 2x 56.6mm x 56.2mm fullrange transducers + 2x passive radiators | 2x 75mm woofers + 2x 20mm tweeters + 1x passive radiator |
| Amplifier Power | 14W | 60W |
| Digital Aux Input | No | No |
| Strap | Yes (built-in loop) | No |
| Frequency Response | - | 50Hz - 20kHz (Manufacturer specified) |
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Prices on this page were last checked October 3, 2026 at 10:26 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
Ultimate Ears Everboom: $149.99 Amazon eBay
Pros: Ultimate Ears Everboom uses 2x 56.6mm x 56.2mm fullrange transducers + 2x passive radiators. Its 949 g, claimed 20 hours (Manufacturer specified) battery life, IP67 protection, aux input and mono playback make it a practical option for its intended room or portable use.
Cons: Careful placement and volume setting remain important for balanced sound. Warm tuning with an upper-bass boost and rolled-off treble, and the bass does not go very deep.
Full Ultimate Ears Everboom review and specifications →
| Amplifier Power | 14W |
|---|---|
| App | Yes |
| Aux Input | Yes |
| Battery Life | 20 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.1 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 8.1” x 3.3” x 4.3” (205 x 85 x 110 mm) |
| Drivers | 2x 56.6mm x 56.2mm fullrange transducers + 2x passive radiators |
| EQ | Yes |
| IP Rating | IP67 |
| Omnidirectional | Yes |
| Party Mode | Yes (PartyUp up to 50 speakers) |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | No |
| Strap | Yes (built-in loop) |
| TWS | No |
| Weight | 2.1 lbs (949 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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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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