Short answer: the Harman Kardon Luna if sound quality matters most, the Ultimate Ears Boom 3 if price matters most. The Harman Kardon Luna ranks #22 of 136 medium speakers at $290.99. The Ultimate Ears Boom 3 ranks #89 at $129.90, $161.09 cheaper.
What the Harman Kardon Luna offers: Pretty balanced sound besides the boosted bass. Watch for: Not stereo. Boosted bass, not as detailed as higher ranked speakers
What the Ultimate Ears Boom 3 offers: Rich and warm bass without muddying mix, crisp highs, excellent 15-hour battery life, stable Bluetooth connectivity, IP67 rated and floats, rugged fabric shell, can pair up to 150 speakers via PartyUp Watch for: Not stereo, barely any bass, recessed treble. You can tell from the micro USB that they are just feeding you the same crap hardware over and over, this is inexcusable for a product released in 2021. Lots of mentions of failing batteries on amazon. Not technically a 360 speaker, only front and rear.
Buy the Harman Kardon Luna when sound quality outweighs the price for you, and the Ultimate Ears Boom 3 when the price outweighs sound quality instead.
Specifications Side By Side
| Harman Kardon Luna | Ultimate Ears Boom 3 | |
|---|---|---|
| Price | $290.99 | $129.90 |
| Ranked | #22 of 136 in Medium Size Portable Bluetooth Speakers | #89 of 136 in Medium Size Portable Bluetooth Speakers |
| App | No | - |
| Aux Input | No | - |
| Bass Extension (-10dB) | 57Hz | 91Hz |
| Battery Life | 12 hours (Manufacturer specified) | 15 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC | - |
| EQ | No | Yes (via app) |
| IP Rating | IP67 | IP67 |
| MicroSD Playback | No | - |
| Power Input | USB-C | Micro USB |
| Stereo | No | Yes |
| Omnidirectional | No | Yes |
| TWS | Yes | Yes |
| USB Playback | Yes | - |
| Weight | 2.5 lbs / 1.13 kg | 1.3 lbs / 608 g |
| Bluetooth Version | 5.3 | 4.2 |
| Dimensions | 8.3" x 3.1" x 3.1" (210 x 78 x 80 mm) | 7.2" x 2.9" (184 x 73 mm) |
| Drivers | 48mm x 90mm woofer, 20mm tweeter | 2x 2" active drivers + 2x 2" x 4" passive radiators |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) | - |
| Output Power | 40W | - |
| Digital Aux Input | No | No |
| Party Mode | - | Yes (PartyUp up to 50 speakers) |
| Built in Microphone | - | No |
| Max Volume | - | 87dB |
Related Speaker Comparisons
Other pairings from the same speaker class worth checking:
- JBL Partybox 110 vs Tribit Maxsound Plus V1/V2/Thunderbox Plus
- B&O Beosound A1 2nd gen vs Tribit Maxsound Plus V1/V2/Thunderbox Plus
- B&O Beosound A1 3rd gen vs Tribit Maxsound Plus V1/V2/Thunderbox Plus
- JBL Flip 7 vs Harman Kardon Luna
- Harman Kardon Luna vs JBL Charge Essential 2
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.
As an eBay Partner, we may be compensated if you make a purchase.
The Two Speakers In Full
Harman Kardon Luna: $290.99 Amazon eBay
Pros: Pretty balanced sound besides the boosted bass.
Cons: Not stereo. Boosted bass, not as detailed as higher ranked speakers
Full Harman Kardon Luna review and specifications →
| App | No |
|---|---|
| Aux Input | No |
| Bass Extension (-10dB) | 57Hz |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| Digital Aux Input | No |
| Dimensions | 8.3" x 3.1" x 3.1" (210 x 78 x 80 mm) |
| Drivers | 48mm x 90mm woofer, 20mm tweeter |
| EQ | No |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) |
| IP Rating | IP67 |
| MicroSD Playback | No |
| Omnidirectional | No |
| Output Power | 40W |
| Power Input | USB-C |
| Stereo | No |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 2.5 lbs / 1.13 kg |
- Links
- Reviews, Comparisons and Sound Samples
- Oluv Patreon: Harman Kardon Luna - sound demo More from Oluv’Sone →
- Alan Ross Reviews: Beats Pill vs Harman Luna vs Bose Flex vs Soundcore Motion Plus More from alanrossreviews →
- Storytripper HD: Klipsch Nashville vs Harman Kardon Luna vs Soundcore Motion 300 More from storytripperhd →
- Reddit Search for Harman Kardon Luna Review
- Head-to-Head Comparisons
- Harman Kardon Luna vs Tribit Maxsound Plus V1/V2/Thunderbox Plus
- Harman Kardon Luna vs Tribit Xsound Mega
- Harman Kardon Luna vs JBL Charge 5 Wifi
- Harman Kardon Luna vs Xiaomi Sound Party
- Harman Kardon Luna vs B&O Beosound A1 3rd gen
- Harman Kardon Luna vs JBL Charge 5
- Harman Kardon Luna vs Soundcore Boom 3i
- Harman Kardon Luna vs JBL Flip 7
- See all 72 comparisons
Ultimate Ears Boom 3: $129.90 Amazon eBay
Pros: Rich and warm bass without muddying mix, crisp highs, excellent 15-hour battery life, stable Bluetooth connectivity, IP67 rated and floats, rugged fabric shell, can pair up to 150 speakers via PartyUp
Cons: Not stereo, barely any bass, recessed treble. You can tell from the micro USB that they are just feeding you the same crap hardware over and over, this is inexcusable for a product released in 2021. Lots of mentions of failing batteries on amazon. Not technically a 360 speaker, only front and rear.
Full Ultimate Ears Boom 3 review and specifications →
| Bass Extension (-10dB) | 91Hz |
|---|---|
| Battery Life | 15 hours (Manufacturer specified) |
| Bluetooth Version | 4.2 |
| Built in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 7.2" x 2.9" (184 x 73 mm) |
| Drivers | 2x 2" active drivers + 2x 2" x 4" passive radiators |
| EQ | Yes (via app) |
| IP Rating | IP67 |
| Max Volume | 87dB |
| Omnidirectional | Yes |
| Party Mode | Yes (PartyUp up to 50 speakers) |
| Power Input | Micro USB |
| Stereo | Yes |
| TWS | Yes |
| Weight | 1.3 lbs / 608 g |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Ultimate Ears Boom 3 vs Ultimate Ears Boom 4
- Ultimate Ears Boom 3 vs Klipsch Groove/Heritage Groove
- Ultimate Ears Boom 3 vs Ultimate Ears Wonderboom
- Ultimate Ears Boom 3 vs Sony SRS-XE300
- Ultimate Ears Boom 3 vs Ultimate Ears Wonderboom 2
- Ultimate Ears Boom 3 vs Ultimate Ears Wonderboom 3
- Ultimate Ears Boom 3 vs Tribit Stormbox
- Ultimate Ears Boom 3 vs Sony SRS-XB20
- See all 77 comparisons