Harman Kardon Onyx Studio 6 vs Soundcore Motion Boom+

Last updated: August 28, 2026

Short answer: the Harman Kardon Onyx Studio 6. It ranks #11 of 73 boombox speakers by sound quality at $130; the Soundcore Motion Boom+ ranks #47 and costs $140, so there is little reason to consider the other one.

What the Harman Kardon Onyx Studio 6 offers: Warm sound with boosted bass. Oluv liked it slightly better than the newer Onyx 7. Watch for: 8 hour battery at medium volume. Not at loud as others.

What the Soundcore Motion Boom+ offers: 80W stereo from dual 30W woofers + dual 10W tweeters with titanium drivers for treble clarity. 13,400mAh battery for 20 hours (12-15 at high volume). IP67 waterproof, floats, rugged build inspires confidence. Bluetooth 5.3 multipoint pairing, Soundcore app EQ, PartyCast 2.0 mode. USB-C input, USB-A output for powerbank. Watch for: Default presets are all warm sounding with rolled off treble. Will need a custom EQ to get closer to neutral. A shrill sounding 6khz peak comes out when volume is above about 60%. Not much deeper bass than a Motion Boom and a lot less deep bass than other speakers in the class.

Buy the Harman Kardon Onyx Studio 6. It ranks higher for sound quality than the Soundcore Motion Boom+ and costs less, which settles it without a real tradeoff to make.

Battery life favors the Soundcore Motion Boom+: rated for 20 hours against 8 hours for the Harman Kardon Onyx Studio 6.

Buy the Harman Kardon Onyx Studio 6 at Amazon ($130) →Buy the Soundcore Motion Boom+ at Amazon ($140) →

Harman Kardon Onyx Studio 6 vs Soundcore Motion Boom+

Specifications Side By Side

Harman Kardon Onyx Studio 6 Soundcore Motion Boom+
Price$130$140 after $40 coupon, Discontinued
Ranked#11 of 73 in Boombox Size Portable Bluetooth Speakers#47 of 73 in Boombox Size Portable Bluetooth Speakers
Aux InputYesYes
Bass Extension (-10dB)37Hz52Hz
Battery Life8 hours (Manufacturer specified)20 hours (Manufacturer specified)
Built in MicrophoneYesNo
IP RatingIPX7IP67
Bluetooth Latency180ms33ms
Max Volume96dB108dB
Party ModeYes (Wireless Dual Sound)Yes (PartyCast up to 100 speakers)
Power InputDC Barrel Connector (19V/2A)USB-C
StereoYesYes
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 kg5.3 lbs / 2.4 kg
Bluetooth CodecsSBCSBC
AppNoYes (Soundcore app)
EQNoYes (App EQ)
Power BankNoYes (USB-A, 5V/2.1A)
USB PlaybackNoNo
Bluetooth Version4.25.3
Output Power50W RMS80W
Dimensions5" x 11.5" x 11.2" (128 x 291 x 284 mm)15.1" x 5.1" x 7.7" (384 x 130 x 196 mm)
Drivers2x 75mm woofers + 2x 20mm tweeters30W: Dual drivers
Digital Aux InputNoNo
Aux Latency-17ms
Discontinued-Yes
Buy the Harman Kardon Onyx Studio 6 at Amazon ($130) →Buy the Soundcore Motion Boom+ at Amazon ($140) →

More useful head-to-heads from the same speaker class:

Prices on this page were last checked August 27, 2026 at 10:09 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 6: $130 Amazon eBay

Harman Kardon Onyx Studio 6 ranking card

Pros: Warm sound with boosted bass. Oluv liked it slightly better than the newer Onyx 7.

Cons: 8 hour battery at medium volume. Not at loud as others.

Full Harman Kardon Onyx Studio 6 review and specifications →

AppNo
Aux InputYes
Bass Extension (-10dB)37Hz
Battery Life8 hours (Manufacturer specified)
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)
Drivers2x 75mm woofers + 2x 20mm tweeters
EQNo
IP RatingIPX7
Max Volume96dB
OmnidirectionalNo
Output Power50W RMS
Party ModeYes (Wireless Dual Sound)
Power BankNo
Power InputDC Barrel Connector (19V/2A)
StereoYes
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 →

Soundcore Motion Boom+: $140 after $40 coupon, Discontinued Amazon eBay

Soundcore Motion Boom+ ranking card

Pros: 80W stereo from dual 30W woofers + dual 10W tweeters with titanium drivers for treble clarity. 13,400mAh battery for 20 hours (12-15 at high volume). IP67 waterproof, floats, rugged build inspires confidence. Bluetooth 5.3 multipoint pairing, Soundcore app EQ, PartyCast 2.0 mode. USB-C input, USB-A output for powerbank.

Cons: Default presets are all warm sounding with rolled off treble. Will need a custom EQ to get closer to neutral. A shrill sounding 6khz peak comes out when volume is above about 60%. Not much deeper bass than a Motion Boom and a lot less deep bass than other speakers in the class. Discontinued.

Full Soundcore Motion Boom+ review and specifications →

AppYes (Soundcore app)
Aux InputYes
Aux Latency17ms
Bass Extension (-10dB)52Hz
Battery Life20 hours (Manufacturer specified)
Bluetooth CodecsSBC
Bluetooth Latency33ms
Bluetooth Version5.3
Built in MicrophoneNo
Digital Aux InputNo
Dimensions15.1" x 5.1" x 7.7" (384 x 130 x 196 mm)
DiscontinuedYes
Drivers30W: Dual drivers
EQYes (App EQ)
IP RatingIP67
Max Volume108dB
OmnidirectionalNo
Output Power80W
Party ModeYes (PartyCast up to 100 speakers)
Power BankYes (USB-A, 5V/2.1A)
Power InputUSB-C
StereoYes
TWSYes
USB PlaybackNo
Weight5.3 lbs / 2.4 kg
Check current price at Amazon ($140) →Search eBay for Soundcore Motion Boom+ →