Short answer: the Harman Kardon Onyx Studio 9. Both are rated 4.1/5 for sound quality (#15 and #17 of 113 boombox speakers), and the Harman Kardon Onyx Studio 9 costs $184.99 against $219.95 for the Zealot ZE41, and with sound quality even, the cheaper one is the better buy.
What the Harman Kardon Onyx Studio 9 gets right: Auracast multi-speaker connection alongside classic stereo pairing. The tradeoff: Slight recessed mids, boost in the upper mids, rolled off upper treble.
Buy the Harman Kardon Onyx Studio 9. Both are rated the same for sound quality, and it costs $34.96 less than the Zealot ZE41.
There is a real gap in water resistance: the Zealot ZE41 at IPX5 (water jets) against the Harman Kardon Onyx Studio 9, which has no water resistance.
Looking for alternatives? See the complete Portable Bluetooth rankings.
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Specifications Side By Side
| Harman Kardon Onyx Studio 9 | Zealot ZE41 | |
|---|---|---|
| Price | $184.99 | $219.95 |
| Ranked | #15 of 113 in Boombox Size Portable Bluetooth Speakers | #17 of 113 in Boombox Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | 41Hz | - |
| Maximum SPL | 101dB (measured by Alan Ross Reviews) | - |
| IP Rating | None | IPX5 |
| Power Input | AC Power Cable (2-Prong) | Type-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 9.3 lbs (4.2 kg) | 25.3 lbs (11.48 kg) |
| App | Yes (Harman Kardon One app) | Yes |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC (inferred; additional codecs unverified) |
| EQ | Yes (App EQ) | Yes (Vocal, Bass Boost, Normal modes) |
| Party Mode | Yes (Auracast) | Yes (PartyAdd up to 100 speakers) |
| USB Playback | No | Yes |
| Bluetooth Version | 5.3 | 5.3 |
| Battery Life | 8 hours (Manufacturer specified) | 4 hours (Manufacturer specified) |
| Amplifier Power | 50W RMS | 300W |
| Dimensions | 11.4” x 11.3” x 5.1” (289.2 x 287.5 x 130 mm) | 22.1” x 9.4” x 13” (562 x 238 x 331 mm) |
| Drivers | 120mm woofer + 3x 20mm tweeters | 191x130mm 140W subwoofer + 2x 93mm 60W midrange drivers + 2x 42mm 20W tweeters |
| Digital Aux Input | No | No |
| Aux Input | No | Yes |
| Strap | No | No |
| Battery Capacity | - | 48000mAh (12x4000mAh) |
| Frequency Response | - | 20Hz - 20kHz (Manufacturer specified) |
| Microphone Input | - | Yes (Karaoke mode) |
| MicroSD Playback | - | Yes |
| Power Bank | - | Yes (USB-A + USB-C) |
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