Harman Kardon Luna vs Soundcore Boom 3i

Last updated: August 19, 2026

Short answer: the Harman Kardon Luna for better sound quality, the Soundcore Boom 3i for the lower price. The Harman Kardon Luna ranks #22 of 136 medium speakers at $290.99. The Soundcore Boom 3i ranks #27 at $110, $180.99 cheaper.

What the Harman Kardon Luna gets right: Pretty balanced sound besides the boosted bass. Watch for: Not stereo. Boosted bass, not as detailed as higher ranked speakers.

What the Soundcore Boom 3i offers: Looks to be designed as a direct competitor to the Charge 5 with a very similar sound profile, warm tuned with boosted bass. The catch: Not quite as good as a Charge 5, doesn’t go quite as loud or sound quite as balanced, but very very close.

Buy the Harman Kardon Luna if sound quality matters more than the price. Buy the Soundcore Boom 3i if the price matters more than sound quality.

Harman Kardon Luna vs Soundcore Boom 3i

Specifications Side By Side

Harman Kardon Luna Soundcore Boom 3i
Price$290.99$110
Ranked#22 of 136 in Medium Size Portable Bluetooth Speakers#27 of 136 in Medium Size Portable Bluetooth Speakers
AppNoYes
Aux InputNoNo
Bass Extension (-10dB)57Hz56Hz
Battery Life12 hours (Manufacturer specified)16 hours (Manufacturer specified)
Bluetooth CodecsSBCSBC, AAC
EQNoYes
IP RatingIP67IP68
MicroSD PlaybackNo-
Power InputUSB-CUSB-C
StereoNoNo
OmnidirectionalNoNo
TWSYesYes
USB PlaybackYes-
Weight2.5 lbs / 1.13 kg1.7 lbs / 783 g
Bluetooth Version5.35.3
Dimensions8.3" x 3.1" x 3.1" (210 x 78 x 80 mm)8.3" x 3.3" x 3.1" (210 x 85 x 78.5 mm)
Drivers48mm x 90mm woofer, 20mm tweeter94mm woofer + tweeter
Frequency Response60Hz - 20kHz (Manufacturer specified)-
Output Power40W50W
Digital Aux InputNoNo
Party Mode-No
Built in Microphone-Yes

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

The Two Speakers In Full

Harman Kardon Luna: $290.99 Amazon

Harman Kardon Luna ranking card

Pros: Pretty balanced sound besides the boosted bass.

Cons: Not stereo. Boosted bass, not as detailed as higher ranked speakers

AppNo
Aux InputNo
Bass Extension (-10dB)57Hz
Battery Life12 hours (Manufacturer specified)
Bluetooth CodecsSBC
Bluetooth Version5.3
Digital Aux InputNo
Dimensions8.3" x 3.1" x 3.1" (210 x 78 x 80 mm)
Drivers48mm x 90mm woofer, 20mm tweeter
EQNo
Frequency Response60Hz - 20kHz (Manufacturer specified)
IP RatingIP67
MicroSD PlaybackNo
OmnidirectionalNo
Output Power40W
Power InputUSB-C
StereoNo
TWSYes
USB PlaybackYes
Weight2.5 lbs / 1.13 kg

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Soundcore Boom 3i: $110 Amazon Bhphotovideo

Soundcore Boom 3i ranking card

Pros: Looks to be designed as a direct competitor to the Charge 5 with a very similar sound profile, warm tuned with boosted bass. Better value for the money than the Charge 5.

Cons: Not quite as good as a Charge 5, doesn’t go quite as loud or sound quite as balanced, but very very close. An earlier firmware version had some bass distortion, update your firmware in the Soundcore App

AppYes
Aux InputNo
Bass Extension (-10dB)56Hz
Battery Life16 hours (Manufacturer specified)
Bluetooth CodecsSBC, AAC
Bluetooth Version5.3
Built in MicrophoneYes
Digital Aux InputNo
Dimensions8.3" x 3.3" x 3.1" (210 x 85 x 78.5 mm)
Drivers94mm woofer + tweeter
EQYes
IP RatingIP68
OmnidirectionalNo
Output Power50W
Party ModeNo
Power InputUSB-C
StereoNo
TWSYes
Weight1.7 lbs / 783 g

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