Harman Kardon Onyx Studio 9 vs JBL Boombox 3

Last updated: October 1, 2026

Short answer: the Onyx Studio 9 for mids and treble, the JBL Boombox 3 for a rugged battery champion. The Boombox 3 is IP67 rated, but dips in the mid bass make the bass sound undefined, it is bass boosted and peaky at 700Hz, and its mids and treble are not quite as good as the Blast. The Onyx Studio 9 adds Auracast multi-speaker connection alongside classic stereo pairing, though it has slightly recessed mids and rolled off upper treble.

Harman Kardon Onyx Studio 9 vs JBL Boombox 3

Buy the Harman Kardon Onyx Studio 9. It is rated higher for sound quality than the JBL Boombox 3 and costs less, which makes it the one to get unless you need something the other one does better.

If battery life is a priority, the JBL Boombox 3 is rated for 24 hours versus 8 hours for the Harman Kardon Onyx Studio 9.

Water resistance is not close: the JBL Boombox 3 is rated at IP67 (brief submersion), well ahead of the Harman Kardon Onyx Studio 9 at no water resistance.

Still deciding? The full Portable Bluetooth rankings cover every ranked option.

Buy the Harman Kardon Onyx Studio 9 at Amazon ($189.99) →Buy the JBL Boombox 3 at Amazon ($349.95) →

Specifications Side By Side

Harman Kardon Onyx Studio 9 JBL Boombox 3
Price$189.99$349.95
Ranked#15 of 90 in Boombox Size Portable Bluetooth Speakers#27 of 90 in Boombox Size Portable Bluetooth Speakers
Bass Extension (-10dB)41Hz43Hz
Maximum SPL101dB (measured by Alan Ross Reviews)110dB (measured by Alan Ross Reviews)
IP RatingNoneIP67
Power InputAC Power Cable (2-Prong)AC Power cable
StereoYesYes
OmnidirectionalNoNo
TWSYesYes
Weight9.3 lbs (4.2 kg)14.8 lbs (6.7 kg)
AppYes (Harman Kardon One app)No
BluetoothYesYes
Bluetooth CodecsSBCSBC
EQYes (App EQ)No
Party ModeYes (Auracast)Yes (PartyBoost up to 100 speakers)
USB PlaybackNoNo
Bluetooth Version5.35.3
Battery Life8 hours (Manufacturer specified)24 hours (Manufacturer specified)
Amplifier Power50W RMS180W AC / 136W battery
Dimensions11.4” x 11.3” x 5.1” (289.2 x 287.5 x 130 mm)19” x 10.1” x 7.9” (482 x 257 x 200 mm)
Drivers120mm woofer + 3x 20mm tweeters1x 189mm subwoofer + 2x 81mm woofers + 2x 20mm tweeters
Digital Aux InputNoNo
Aux InputNoYes
StrapNoNo
Aux Latency-25ms
Bluetooth Latency-100ms
Power Bank-Yes (USB-A)
Built-in Microphone-No
FM Tuner-No
Microphone Input-No
MicroSD Playback-No
Buy the Harman Kardon Onyx Studio 9 at Amazon ($189.99) →Buy the JBL Boombox 3 at Amazon ($349.95) →

More top alternatives to Harman Kardon Onyx Studio 9:

Prices on this page were last checked October 2, 2026 at 10:18 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 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).

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 →

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 →

JBL Boombox 3: $349.95 Amazon eBay

JBL Boombox 3 ranking card

Newer model: the JBL Boombox 4, ranked higher, rated 4/5.

Pros: IP67 rated. 24 hour battery life (6.5 hour charge time). Doubles as a power bank. PartyBoost links up to 100 compatible JBL speakers. Three-way speaker system with subwoofer. Measured bass extension of 43Hz (-10dB).

Cons: Dips in mid bass range which makes the bass sound undefined, bass boosted, peaky at 700Hz, not quite as good mids and treble as the Blast.

Full JBL Boombox 3 review and specifications →

Amplifier Power180W AC / 136W battery
AppNo
Aux InputYes
Aux Latency25ms
Bass Extension (-10dB)43Hz
Battery Life24 hours (Manufacturer specified)
BluetoothYes
Bluetooth CodecsSBC
Bluetooth Latency100ms
Bluetooth Version5.3
Built-in MicrophoneNo
Digital Aux InputNo
Dimensions19” x 10.1” x 7.9” (482 x 257 x 200 mm)
Drivers1x 189mm subwoofer + 2x 81mm woofers + 2x 20mm tweeters
EQNo
FM TunerNo
IP RatingIP67
Maximum SPL110dB (measured by Alan Ross Reviews)
MicroSD PlaybackNo
Microphone InputNo
OmnidirectionalNo
Party ModeYes (PartyBoost up to 100 speakers)
Power BankYes (USB-A)
Power InputAC Power cable
StereoYes
StrapNo
TWSYes
USB PlaybackNo
Weight14.8 lbs (6.7 kg)
Check current price at Amazon ($349.95) →Search eBay for JBL Boombox 3 →