Harman Kardon Onyx Studio 9 vs Zealot ZE01

Last updated: October 12, 2026

Short answer: the Harman Kardon Onyx Studio 9. It ranks #15 of 98 boombox speakers by sound quality, rated 4.1/5, at $189.99. The Zealot ZE01 ranks #36, rated 3.7/5, at $159.90, $30.09 cheaper, which does not close the gap in sound quality.

Harman Kardon Onyx Studio 9 vs Zealot ZE01

The Harman Kardon Onyx Studio 9 is the better-sounding, lighter option. An elegant 9.3 lbs (4.2 kg) living-room portable with a measured 41Hz -10dB bass point, 101dB maximum level, three tweeters, app EQ, stereo pairing and Auracast multi-speaker linking. At 9.3 lbs (4.2 kg) it weighs noticeably less than the Zealot ZE01 at 13.2 lbs (6 kg). It links with other speakers (Auracast), which the Zealot ZE01 cannot. The catch: It has no water resistance, aux input or USB playback, and its eight-hour claimed battery life is short for an outdoor portable.

The Zealot ZE01 is the longer-running, tougher option. Appears to be the same internals as the Zealot S95. It is rated for 40 hours of battery against 8 for the Harman Kardon Onyx Studio 9. It is rated IPX6, while the Harman Kardon Onyx Studio 9 has no water resistance. It keeps a wired aux input, which the Harman Kardon Onyx Studio 9 lacks. Watch for: A little rolled off up top and not that balanced through the rest of the range.

Buy the Harman Kardon Onyx Studio 9. It is rated higher for sound quality, and the $30.09 you would save on the Zealot ZE01 does not close the gap.

Want more options? Browse the full Portable Bluetooth rankings.

Check Harman Kardon Onyx Studio 9 price at Amazon ($189.99) →Check Zealot ZE01 price at Amazon ($159.90) →

Specifications Side By Side

Harman Kardon Onyx Studio 9 Zealot ZE01
Price$189.99$159.90
Ranked#15 of 98 in Boombox Size Portable Bluetooth Speakers#36 of 98 in Boombox Size Portable Bluetooth Speakers
Bass Extension (-10dB)41Hz45Hz
Maximum SPL101dB (measured by Alan Ross Reviews)-
IP RatingNoneIPX6
Power InputAC Power Cable (2-Prong)USB-C
StereoYesYes
OmnidirectionalNoNo
TWSYesYes
Weight9.3 lbs (4.2 kg)13.2 lbs (6.0 kg)
AppYes (Harman Kardon One app)No
BluetoothYesYes
Bluetooth CodecsSBCSBC
EQYes (App EQ)Yes (multiple modes)
Party ModeYes (Auracast)No
USB PlaybackNoYes
Bluetooth Version5.35.4
Battery Life8 hours (Manufacturer specified)40 hours (Manufacturer specified)
Amplifier Power50W RMS120W RMS / 150W peak
Dimensions11.4” x 11.3” x 5.1” (289.2 x 287.5 x 130 mm)13.1” x 11.2” x 8.1” (332 x 284 x 207 mm)
Drivers120mm woofer + 3x 20mm tweetersDual 120mm speakers + dual 42mm speakers
Digital Aux InputNoNo
Aux InputNoYes
StrapNo-
MicroSD Playback-Yes
Power Bank-Yes (USB-A + USB-C)
Built-in Microphone-No
Check Harman Kardon Onyx Studio 9 price at Amazon ($189.99) →Check Zealot ZE01 price at Amazon ($159.90) →

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Prices on this page were last checked October 12, 2026 at 4:13 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 9: $189.99 Amazon $189.99 eBay

Harman Kardon Onyx Studio 9 ranking card

Older models: the Harman Kardon Onyx Studio 8 (ranked higher, rated 4.1/5), the Harman Kardon Onyx Studio 7 (ranked higher, rated 4.1/5), the Harman Kardon Onyx Studio 6 (ranked higher, rated 4.1/5), the Harman Kardon Onyx Studio 5 (ranked lower, rated 3.9/5) and the Harman Kardon Onyx Studio 4 (rated 3.3/5). See every Harman Kardon Onyx Studio generation.

Pros: An elegant 4.2kg living-room portable with a measured 41Hz -10dB bass point, 101dB maximum level, three tweeters, app EQ, stereo pairing and Auracast multi-speaker linking. Reviews praise its balanced, smooth presentation and non-fatiguing treble, making it a more music-focused choice than most party speakers. Measured bass extension of 41Hz (-10dB).

Cons: It has no water resistance, aux input or USB playback, and its eight-hour claimed battery life is short for an outdoor portable. Bass is less deep than some earlier Onyx Studio models, while the slightly recessed mids and rolled-off top end mean it is not the most open or detailed option; it still charges from an AC power cable rather than USB-C.

Full Harman Kardon Onyx Studio 9 review and specifications →

ReleasedDec 2024 (1 year ago)
Amplifier Power50W RMS
AppYes (Harman Kardon One app)
Aux InputNo
Bass Extension (-10dB)41Hz
Battery Life8 hours (Manufacturer specified)
BluetoothYes
Bluetooth CodecsSBC
Bluetooth Version5.3
Digital Aux InputNo
Dimensions11.4” x 11.3” x 5.1” (289.2 x 287.5 x 130 mm)
Drivers120mm woofer + 3x 20mm tweeters
EQYes (App EQ)
IP RatingNone
Maximum SPL101dB (measured by Alan Ross Reviews)
OmnidirectionalNo
Party ModeYes (Auracast)
Power InputAC Power Cable (2-Prong)
StereoYes
StrapNo
TWSYes
USB PlaybackNo
Weight9.3 lbs (4.2 kg)
Check current price at Amazon ($189.99) →Search eBay for Harman Kardon Onyx Studio 9 →

Zealot ZE01: $159.90 Amazon $159.90 AliExpress $126.02 eBay

Zealot ZE01 ranking card

Pros: Appears to be the same internals as the Zealot S95. Measured bass extension of 45Hz (-10dB).

Cons: A little rolled off up top and not that balanced through the rest of the range. Clarity isn’t as good as better speakers.

Full Zealot ZE01 review and specifications →

ReleasedJan 2025 (1 year ago)
Amplifier Power120W RMS / 150W peak
AppNo
Aux InputYes
Bass Extension (-10dB)45Hz
Battery Life40 hours (Manufacturer specified)
BluetoothYes
Bluetooth CodecsSBC
Bluetooth Version5.4
Built-in MicrophoneNo
Digital Aux InputNo
Dimensions13.1” x 11.2” x 8.1” (332 x 284 x 207 mm)
DriversDual 120mm speakers + dual 42mm speakers
EQYes (multiple modes)
IP RatingIPX6
MicroSD PlaybackYes
OmnidirectionalNo
Party ModeNo
Power BankYes (USB-A + USB-C)
Power InputUSB-C
StereoYes
TWSYes
USB PlaybackYes
Weight13.2 lbs (6.0 kg)
Check current price at Amazon ($159.90) →Check current price at AliExpress ($126.02) →Search eBay for Zealot ZE01 →