Harman Kardon Onyx Studio 6 vs Zealot ZE01

Last updated: October 12, 2026

Short answer: the Harman Kardon Onyx Studio 9, if you are buying new. The Harman Kardon Onyx Studio 6 ranks higher than the Zealot ZE01 (#13 vs #36 of 98 boombox speakers) but is discontinued; its replacement, the Harman Kardon Onyx Studio 9, is rated 4.1/5 at $189.99 and is still sold new.

Harman Kardon Onyx Studio 6 vs Zealot ZE01

The Harman Kardon Onyx Studio 6 is the better-sounding, deeper-bass pick. Harman Kardon Onyx Studio 6 uses a 120mm woofer, 25mm tweeter and passive radiator. Its bass reaches about 37Hz before falling 10dB, against 45Hz for the Zealot ZE01. At 6.5 lbs (2.94 kg) it weighs much less than the Zealot ZE01 at 13.2 lbs (6 kg). It links with other speakers (Wireless Dual Sound), which the Zealot ZE01 cannot. The tradeoff: Warm tuning with boosted bass, and not as loud as others.

The Zealot ZE01 is the longer-running choice. 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 6. It has an adjustable EQ, which the Harman Kardon Onyx Studio 6 lacks. It plays in stereo from a single unit, unlike the Harman Kardon Onyx Studio 6. 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, the replacement for the discontinued Harman Kardon Onyx Studio 6; it is rated higher for sound quality than the Zealot ZE01.

Want more options? Browse the full Portable Bluetooth rankings.

Check Harman Kardon Onyx Studio 6 price at Amazon ($130) →Check Zealot ZE01 price at Amazon ($159.90) →

Specifications Side By Side

Harman Kardon Onyx Studio 6 Zealot ZE01
Price$130 Discontinued$159.90
Ranked#13 of 98 in Boombox Size Portable Bluetooth Speakers#36 of 98 in Boombox Size Portable Bluetooth Speakers
Aux InputYesYes
Bass Extension (-10dB)37Hz45Hz
Battery Life8 hours (Manufacturer specified)40 hours (Manufacturer specified)
Built-in MicrophoneYesNo
IP RatingIPX7IPX6
Bluetooth Latency180ms-
Maximum SPL96dB (measured by Alan Ross Reviews)-
Party ModeYes (Wireless Dual Sound)No
Power InputDC Barrel Connector (19V/2A)USB-C
StereoNoYes
OmnidirectionalNoNo
TWSYes (see https://www.reddit.com/r/Bluetooth_Speakers/comments/w339x5/how_to_harman_kardon_onyx_studio_5_6_dual_sound/)Yes
Weight6.5 lbs (2.94 kg)13.2 lbs (6.0 kg)
BluetoothYesYes
Bluetooth CodecsSBCSBC
AppNoNo
EQNoYes (multiple modes)
Power BankNoYes (USB-A + USB-C)
USB PlaybackNoYes
Bluetooth Version4.25.4
Amplifier Power50W RMS120W RMS / 150W peak
Dimensions5” x 11.5” x 11.2” (128 x 291 x 284 mm)13.1” x 11.2” x 8.1” (332 x 284 x 207 mm)
Drivers1x 120mm (4.7”) woofer + 1x 25mm (1”) tweeter + 1x passive radiatorDual 120mm speakers + dual 42mm speakers
Digital Aux InputNoNo
StrapNo-
MicroSD Playback-Yes
Check Harman Kardon Onyx Studio 6 price at Amazon ($130) →Check Zealot ZE01 price at Amazon ($159.90) →

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The Two Speakers In Full

Harman Kardon Onyx Studio 6: $130 Discontinued Amazon $130 eBay

Harman Kardon Onyx Studio 6 ranking card

Newer model: the Harman Kardon Onyx Studio 9, ranked lower, rated 4.1/5, released Dec 2024.

Older models: 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: Harman Kardon Onyx Studio 6 uses a 120mm woofer, 25mm tweeter and passive radiator. Its 2.94 kg, claimed 8 hours (Manufacturer specified) battery life, IPX7 protection, aux input and up to 96dB make it a practical option for its intended room or portable use. Measured bass extension of 37Hz (-10dB).

Cons: Bass is limited by its 37Hz specification. There is no companion app. No EQ adjustment. Warm tuning with boosted bass, and not as loud as others. Discontinued.

Full Harman Kardon Onyx Studio 6 review and specifications →

ReleasedSep 2019 (7 years ago)
Amplifier Power50W RMS
AppNo
Aux InputYes
Bass Extension (-10dB)37Hz
Battery Life8 hours (Manufacturer specified)
BluetoothYes
Bluetooth CodecsSBC
Bluetooth Latency180ms
Bluetooth Version4.2
Built-in MicrophoneYes
Digital Aux InputNo
Dimensions5” x 11.5” x 11.2” (128 x 291 x 284 mm)
Drivers1x 120mm (4.7”) woofer + 1x 25mm (1”) tweeter + 1x passive radiator
EQNo
IP RatingIPX7
Maximum SPL96dB (measured by Alan Ross Reviews)
OmnidirectionalNo
Party ModeYes (Wireless Dual Sound)
Power BankNo
Power InputDC Barrel Connector (19V/2A)
StereoNo
StrapNo
TWSYes (see https://www.reddit.com/r/Bluetooth_Speakers/comments/w339x5/how_to_harman_kardon_onyx_studio_5_6_dual_sound/)
USB PlaybackNo
Weight6.5 lbs (2.94 kg)
Check current price at Amazon ($130) →Search eBay for Harman Kardon Onyx Studio 6 →

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 →