Harman Kardon Onyx Studio 9 Review: Ranked #14 of 75

Last updated: September 18, 2026

The Harman Kardon Onyx Studio 9 ranks #14 out of 75 total Boombox Size Portable Bluetooth Speakers for sound quality. See all Portable Bluetooth rankings for every top pick.

Brand: Harman Kardon

Prices on this page were last checked September 22, 2026 at 5:11 AM 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.

As an eBay Partner, we may be compensated if you make a purchase.

Harman Kardon Onyx Studio 9 - ranked #14 of 75 Boombox Size Portable Bluetooth Speakers · Editor's rating 4.1/5
Check price at Amazon ($189.99) →

#14 Harman Kardon Onyx Studio 9: $189.99 Amazon eBay

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.

Related speakers: Harman Kardon Onyx Studio 4, Harman Kardon Onyx Studio 5, Harman Kardon Onyx Studio 6, Harman Kardon Onyx Studio 7, Harman Kardon Onyx Studio 8.

How it compares: Just above it: Harman Kardon Onyx Studio 7 - $59 more. Just below it: Zealot ZE51 - $106 more, 4 fewer hours of battery life.

Amplifier Power50W RMS
AppYes (Harman Kardon One app)
Aux InputNo
Bass Extension (-10dB)41Hz
Battery Life8 hours (Manufacturer specified)
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
TWSYes
USB PlaybackNo
Weight9.3 lbs (4.2 kg)
Check current price at Amazon ($189.99) →Search eBay for Harman Kardon Onyx Studio 9 →

More Harman Kardon speakers →