Harman Kardon Go + Play 3 vs Harman Kardon Onyx Studio 9

Last updated: October 1, 2026

Short answer: the Harman Kardon Go + Play 3, unless Auracast matters. It ranks #3 of 90 against #15 of 90 for the Onyx Studio 9 and its bass is warm and boosted. The Onyx Studio 9 adds Auracast multi-speaker connection alongside classic stereo pairing, but its mids are slightly recessed, the upper mids are boosted and the upper treble rolls off.

Harman Kardon Go + Play 3 vs Harman Kardon Onyx Studio 9

Buy the Harman Kardon Go + Play 3. It is rated higher for sound quality, and saving $195.01 with the Harman Kardon Onyx Studio 9 does not make up for the sound-quality gap.

Looking for alternatives? See the complete Portable Bluetooth rankings.

Buy the Harman Kardon Go + Play 3 at Amazon ($385) →Buy the Harman Kardon Onyx Studio 9 at Amazon ($189.99) →

Specifications Side By Side

Harman Kardon Go + Play 3 Harman Kardon Onyx Studio 9
Price$385$189.99
Ranked#3 of 90 in Boombox Size Portable Bluetooth Speakers#15 of 90 in Boombox Size Portable Bluetooth Speakers
AppYes (Harman Kardon One app)Yes (Harman Kardon One app)
Aux Latency112ms-
Bass Extension (-10dB)35Hz41Hz
Battery Life8 hours (Manufacturer specified)8 hours (Manufacturer specified)
Built-in MicrophoneYes-
EQYes (App EQ)Yes (App EQ)
IP RatingNoneNone
Bluetooth Latency120ms-
Maximum SPL103dB (measured by Alan Ross Reviews)101dB (measured by Alan Ross Reviews)
Power InputAC Power brickAC Power Cable (2-Prong)
StereoYesYes
OmnidirectionalNoNo
TWSYesYes
Weight10.4 lbs (4.7 kg)9.3 lbs (4.2 kg)
BluetoothYesYes
Bluetooth CodecsSBC, AACSBC
Power BankYes-
Party ModeNoYes (Auracast)
USB PlaybackNoNo
Bluetooth Version5.25.3
Amplifier Power160W RMS50W RMS
Dimensions17.3” x 9.4” x 7.6” (439 x 240 x 192 mm)11.4” x 11.3” x 5.1” (289.2 x 287.5 x 130 mm)
Aux InputYesNo
Drivers1x 130mm (5”) subwoofer + 2x 70mm midrange drivers + 2x 20mm tweeters120mm woofer + 3x 20mm tweeters
Digital Aux InputNoNo
StrapNoNo
Buy the Harman Kardon Go + Play 3 at Amazon ($385) →Buy the Harman Kardon Onyx Studio 9 at Amazon ($189.99) →

More worthwhile head-to-heads for Harman Kardon Go + Play 3:

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 Go + Play 3: $385 Amazon eBay

Harman Kardon Go + Play 3 ranking card

Older model: the Harman Kardon Go + Play 2 (ranked lower, rated 3.9/5).

Pros: Warm sound with boosted bass. Deepest bass out of any speaker in this size. Sound is more natural than the Go + Play2. An aux input, a built-in microphone, a power bank function, stereo pairing and hidden button combinations for adjusting bass and treble. Measured bass extension of 35Hz (-10dB).

Cons: Just a little over half as loud as the higher rated boomboxes. Only 8 hours of battery at medium volume. No water rating.

Setup: Use the hidden EQ modes to adjust the bass up when outside and down when inside. To adjust bass, quickly press the bluetooth and volume down buttons together, the number of light flashes tell you what mode you’re in. To adjust treble, quickly press the volume up and phone buttons at the same time, the number of yellow flashes on the light tell you what mode you are in.

Full Harman Kardon Go + Play 3 review and specifications →

Amplifier Power160W RMS
AppYes (Harman Kardon One app)
Aux InputYes
Aux Latency112ms
Bass Extension (-10dB)35Hz
Battery Life8 hours (Manufacturer specified)
BluetoothYes
Bluetooth CodecsSBC, AAC
Bluetooth Latency120ms
Bluetooth Version5.2
Built-in MicrophoneYes
Digital Aux InputNo
Dimensions17.3” x 9.4” x 7.6” (439 x 240 x 192 mm)
Drivers1x 130mm (5”) subwoofer + 2x 70mm midrange drivers + 2x 20mm tweeters
EQYes (App EQ)
IP RatingNone
Maximum SPL103dB (measured by Alan Ross Reviews)
OmnidirectionalNo
Party ModeNo
Power BankYes
Power InputAC Power brick
StereoYes
StrapNo
TWSYes
USB PlaybackNo
Weight10.4 lbs (4.7 kg)
Check current price at Amazon ($385) →Search eBay for Harman Kardon Go + Play 3 →

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 →