Harman Kardon Onyx Studio 9 vs Yeahbox Sonic Boom Max 3 (August 2026)

Short answer: the Harman Kardon Onyx Studio 9. It ranks #13 of 70 boombox speakers at $186.99; the Yeahbox Sonic Boom Max 3 ranks #37 and costs $228.99, so there is not much of a tradeoff to weigh.

What the Harman Kardon Onyx Studio 9 gets right: Auracast multi-speaker connection alongside classic stereo pairing. The tradeoff: Slight recessed mids, boost in the upper mids, rolled off upper treble.

On the Yeahbox Sonic Boom Max 3 side: 200W RMS (300W peak) true 3-way, 5-driver array. The tradeoff: A budget import brand with limited independent testing - specs are manufacturer-claimed.

Buy the Harman Kardon Onyx Studio 9 if the ranking matters more than the price. Buy the Yeahbox Sonic Boom Max 3 if the price matters more than the ranking.

Specifications Side By Side

	Harman Kardon Onyx Studio 9	Yeahbox Sonic Boom Max 3
Price	$186.99	$228.99
Ranked	#13 of 70 in Boombox Size Portable Bluetooth Speakers	#37 of 70 in Boombox Size Portable Bluetooth Speakers
Bass Extension (-10dB)	41Hz	-
Max Volume	101dB	-
IP Rating	None	IPX6
Power Input	USB-C	USB-C
Stereo	Yes	Yes
TWS	Yes	Yes
Weight	9.3 lbs / 4.2 kg	16.8 lbs / 7.64 kg
App	Yes (Harman Kardon One app)	Yes
Bluetooth Codecs	SBC	-
EQ	Yes (App EQ)	Yes
Party Mode	Yes (Auracast)	-
USB Playback	No	Yes
Bluetooth Version	5.3	5.3
Battery Life	8 hours (Manufacturer specified)	111Wh (14.8V/7,500mAh) (Manufacturer specified)
Output Power	50W RMS	200W RMS / 300W Peak
Dimensions	11.39" x 11.32" x 5.12" (289.2 x 287.5 x 130 mm)	20.67" x 8.27" x 10.55" (525 x 210 x 268 mm)
Drivers	120mm woofer + 3x 20mm tweeters	189x114mm woofer, 2x 89mm midrange, 2x 38mm tweeters
Aux Input	-	Yes
MicroSD Playback	-	Yes

The Two Speakers In Full

Harman Kardon Onyx Studio 9: $186.99 Amazon

Pros: Auracast multi-speaker connection alongside classic stereo pairing. Harman Kardon One app with EQ. USB-C charging, up from the previous generation’s AC power brick.

Cons: Slight recessed mids, boost in the upper mids, rolled off upper treble. Not as deep bass as previous Onyx Studio speakers.

App	Yes (Harman Kardon One app)
Bass Extension (-10dB)	41Hz
Battery Life	8 hours (Manufacturer specified)
Bluetooth Codecs	SBC
Bluetooth Version	5.3
Dimensions	11.39" x 11.32" x 5.12" (289.2 x 287.5 x 130 mm)
Drivers	120mm woofer + 3x 20mm tweeters
EQ	Yes (App EQ)
IP Rating	None
Max Volume	101dB
Output Power	50W RMS
Party Mode	Yes (Auracast)
Power Input	USB-C
Stereo	Yes
TWS	Yes
USB Playback	No
Weight	9.3 lbs / 4.2 kg

Check current price at Amazon ($186.99) →

Yeahbox Sonic Boom Max 3: $228.99 Amazon

Pros: 200W RMS (300W peak) true 3-way, 5-driver array. 111Wh (14.8V/7,500mAh) battery with fast charging up to 60W. Bluetooth 5.3 with stereo TWS pairing, plus aux, USB, and microSD playback.

Cons: A budget import brand with limited independent testing - specs are manufacturer-claimed, and its water/dust rating is reported inconsistently across listings (IPX6 on Yeahbox’s own site, IP66 or IP67 on various marketplace listings).

App	Yes
Aux Input	Yes
Battery Life	111Wh (14.8V/7,500mAh) (Manufacturer specified)
Bluetooth Version	5.3
Dimensions	20.67" x 8.27" x 10.55" (525 x 210 x 268 mm)
Drivers	189x114mm woofer, 2x 89mm midrange, 2x 38mm tweeters
EQ	Yes
IP Rating	IPX6
MicroSD Playback	Yes
Output Power	200W RMS / 300W Peak
Power Input	USB-C
Stereo	Yes
TWS	Yes
USB Playback	Yes
Weight	16.8 lbs / 7.64 kg

Check current price at Amazon ($228.99) →

As an Amazon Associate I earn from qualifying purchases.

Product prices and availability were last checked August 9, 2026 at 6:57 AM UTC 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.