Short answer: the Harman Kardon Onyx Studio 4 for better sound quality, the Zealot S67 for the lower price. The Harman Kardon Onyx Studio 4 ranks #47 of 77 large speakers at $100. The Zealot S67 ranks #76 at $80, $20 cheaper.
What the Harman Kardon Onyx Studio 4 offers: 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. Watch for: 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.
What the Zealot S67 offers: 60W output power, 20-hour battery life, IPX6 waterproof, Bluetooth 5.2, TWS stereo pairing, EQ with 3 sound modes, dual drivers with passive radiator, MicroSD and AUX support, built-in microphone, USB-C charging Watch for: A lot of distortion above 50%, no deep bass, rolled off treble. Just not a good sounding speaker.
Buy the Harman Kardon Onyx Studio 4 if sound quality is the priority over the price, or the Zealot S67 if the price is the priority over sound quality.
If sound quality matters at all to you, skip the Zealot S67. It ranks near the bottom of the 77 large speakers, so look higher up the list instead.
Battery life favors the Zealot S67: rated for 20 hours against 8 hours for the Harman Kardon Onyx Studio 4.
There is a real gap in water resistance: the Zealot S67 at IPX6 (powerful water jets) against the Harman Kardon Onyx Studio 4, which has no water resistance.
Specifications Side By Side
| Harman Kardon Onyx Studio 4 | Zealot S67 | |
|---|---|---|
| Price | $100 Discontinued | $80 |
| Ranked | #47 of 77 in Large Size Portable Bluetooth Speakers | #76 of 77 in Large Size Portable Bluetooth Speakers |
| App | Yes (HK Connect) | No |
| Aux Input | Yes | Yes |
| Battery Life | 8 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| EQ | No | No |
| IP Rating | None | IPX6 |
| Party Mode | Yes (Connect+ up to 100 speakers) | No |
| Power Bank | No | No |
| TWS | Yes | Yes |
| Weight | 4.5 lbs / 2.06 kg | 5.3 lbs / 2.4 kg |
| Bluetooth Codecs | SBC | SBC |
| Built in Microphone | Yes | Yes |
| Power Input | DC Barrel Connector (19V/2.1A) | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| Bluetooth Version | 4.2 | 5.2 |
| Drivers | 2x 75mm woofers, 2x 20mm tweeters | 60W: Dual drivers + passive radiator |
| Dimensions | 11.4" x 11.4" x 5.1" (290 x 290 x 130 mm) | 11.6" x 4.8" x 5.2" (294 x 122 x 132 mm) |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) | - |
| Output Power | 60W | 60W |
| Discontinued | Yes | - |
| Digital Aux Input | No | No |
| MicroSD Playback | - | Yes |
Related Speaker Comparisons
A few more comparisons worth a look in the same class:
- Soundcore Motion Boom vs Zealot S97
- Soundcore Rave Neo 2 vs Zealot S97
- Dockin D Fine vs Doss Extreme Boom
- Soundcore Select Pro vs Harman Kardon Onyx Studio 4
- Tribit Stormbox Lava vs Zealot S67
Prices on this page were last checked August 27, 2026 at 10:09 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
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 →
| App | Yes (HK Connect) |
|---|---|
| Aux Input | Yes |
| Battery Life | 8 hours (Manufacturer specified) |
| 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) |
| Discontinued | Yes |
| Drivers | 2x 75mm woofers, 2x 20mm tweeters |
| EQ | No |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) |
| IP Rating | None |
| Omnidirectional | No |
| Output Power | 60W |
| Party Mode | Yes (Connect+ up to 100 speakers) |
| Power Bank | No |
| Power Input | DC Barrel Connector (19V/2.1A) |
| Stereo | Yes |
| TWS | Yes |
| Weight | 4.5 lbs / 2.06 kg |
- Links
- Reviews, Comparisons and Sound Samples
- Geri’s Collection: Harman Kardon Onyx 7 vs Onyx 4
- OCM Reviews: Onyx Studio 4 Vs Onyx Studio 5 - Sound Quality Comparison - Bluetooth Speaker
- Alan Ross Reviews: Ultimate HK Onyx Studio speaker review and comparison! 8 speakers! More from alanrossreviews →
- Reddit Search for Harman Kardon Onyx Studio 4 Review
- Head-to-Head Comparisons
- Harman Kardon Onyx Studio 4 vs Zealot S97
- Harman Kardon Onyx Studio 4 vs JBL Xtreme 2
- Harman Kardon Onyx Studio 4 vs Tronsmart Halo 100
- Harman Kardon Onyx Studio 4 vs W-King D8
- Harman Kardon Onyx Studio 4 vs Sony SRS-XB43
- Harman Kardon Onyx Studio 4 vs JBL Xtreme
- Harman Kardon Onyx Studio 4 vs Doss Soundbox XL
- Harman Kardon Onyx Studio 4 vs Sony ULT Field 5
- See all 38 comparisons
Zealot S67: $80 Amazon Aliexpress eBay
Pros: 60W output power, 20-hour battery life, IPX6 waterproof, Bluetooth 5.2, TWS stereo pairing, EQ with 3 sound modes, dual drivers with passive radiator, MicroSD and AUX support, built-in microphone, USB-C charging
Cons: A lot of distortion above 50%, no deep bass, rolled off treble. Just not a good sounding speaker.
Full Zealot S67 review and specifications →
| App | No |
|---|---|
| Aux Input | Yes |
| Battery Life | 20 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.2 |
| Built in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 11.6" x 4.8" x 5.2" (294 x 122 x 132 mm) |
| Drivers | 60W: Dual drivers + passive radiator |
| EQ | No |
| IP Rating | IPX6 |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Output Power | 60W |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| Weight | 5.3 lbs / 2.4 kg |
- Links
- Reviews, Comparisons and Sound Samples
- Jay’s Straight Up Reviews & More: ZEALOT S-67 🦨 75w Bluetooth Speaker Review🤦🏼♂️ & Comparison With W-King X10. More from JaysStraightUpReviews →
- Jay’s Straight Up Reviews & More: On a Ledge 🪟 Zealot S67 🆚 Soundcore Select Pro - Bluetooth Speaker Comparison
- Jay’s Straight Up Reviews & More: Ortizan M8🦨 Bluetooth Speaker. Is This The Budget JBL Xtreme 3 Killer? Better Than Zealot S67?
- Reddit Search for Zealot S67 Review
- Head-to-Head Comparisons