Short answer: the Harman Kardon Luna. It ranks #26 of 175 medium speakers by sound quality, rated 4.0/5, at $290.99. The Ultimate Ears Megaboom 3 ranks #108, rated 3.0/5, at $191.99, $99 cheaper, which does not close the gap in sound quality.
The Harman Kardon Luna is the better-sounding, deeper-bass choice. The sound is fairly balanced apart from the boosted bass. Its bass reaches about 57Hz before falling 10dB, against 70Hz for the Ultimate Ears Megaboom 3. It charges over USB-C rather than Micro USB. Watch for: Boosted bass, and less detailed than higher-ranked speakers.
The Ultimate Ears Megaboom 3 is the longer-running option. IP67 rated, floats, and survives drops from up to 1 meter. It is rated for 20 hours of battery against 12 for the Harman Kardon Luna. It has an adjustable EQ, which the Harman Kardon Luna lacks. Watch for: Not stereo, barely any bass.
Buy the Harman Kardon Luna. It is rated higher for sound quality, and the $99 you would save on the Ultimate Ears Megaboom 3 does not close the gap.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| Harman Kardon Luna | Ultimate Ears Megaboom 3 | |
|---|---|---|
| Price | $290.99 | $191.99 |
| Ranked | #26 of 175 in Medium Size Portable Bluetooth Speakers | #108 of 175 in Medium Size Portable Bluetooth Speakers |
| App | No | Yes (UE | BOOM app) |
| Aux Input | No | No |
| Bass Extension (-10dB) | 57Hz | 70Hz |
| Battery Life | 12 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| EQ | No | Yes (App EQ) |
| IP Rating | IP67 | IPX7 |
| MicroSD Playback | No | - |
| Power Input | USB-C | Micro USB |
| Stereo | No | No |
| Omnidirectional | No | Yes |
| TWS | Yes | Yes |
| USB Playback | Yes | - |
| Weight | 2.5 lbs (1.13 kg) | 2 lbs (925 g) |
| Bluetooth Version | 5.3 | 4.2 |
| Dimensions | 8.3” x 3.1” x 3.1” (210 x 78 x 80 mm) | 3.4” x 8.9” x 3.4” (87 x 225 x 87 mm) |
| Drivers | 48mm x 90mm woofer, 20mm tweeter | 2x 50mm fullrange |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) | 60Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | 40W | - |
| Digital Aux Input | No | No |
| Maximum SPL | - | 98dB (measured by Alan Ross Reviews) |
| Party Mode | - | Yes (PartyUp up to 50 speakers) |
| Strap | - | Yes (built-in loop) |
Related Speaker Comparisons
More top alternatives to Harman Kardon Luna:
- Harman Kardon Luna vs EarFun Uboom L
- Soundcore Motion 300 vs Harman Kardon Luna
- Soundcore Motion+ vs Harman Kardon Luna
- Soundcore Boost “upgraded” 2021 vs Harman Kardon Luna
- Harman Kardon Luna vs Minirig 4
Prices on this page were last checked October 12, 2026 at 4:13 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 $290.99 eBay
Newer model: the Harman Kardon Luna 2, ranked higher, rated 4.1/5, released Mar 2026. It adds app control and adjustable EQ. See every Harman Kardon Luna generation.
Pros: Harman Kardon Luna uses 48mm x 90mm woofer, 20mm tweeter. Its 1.13 kg, claimed 12 hours (Manufacturer specified) battery life, IP67 protection and mono playback make it a practical option for its intended room or portable use. The sound is fairly balanced apart from the boosted bass. Measured bass extension of 57Hz (-10dB).
Cons: Bass is limited by its 57Hz specification. There is no companion app. No EQ adjustment. Boosted bass, and less detailed than higher-ranked speakers.
Full Harman Kardon Luna review and specifications →
| Released | Sep 2023 (3 years ago) |
|---|---|
| Amplifier Power | 40W |
| App | No |
| Aux Input | No |
| Bass Extension (-10dB) | 57Hz |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth | Yes |
| 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 |
| 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 - The Anti Shill!: Onyx Studio 9 or Go Play 3? Or even the HK Luna?? More from alanrossreviews →
- Alan Ross Reviews: Beats Pill vs Harman Luna vs Bose Flex vs Soundcore Motion Plus
- Mateusz Cholewa: Harman Kardon Luna 2 UNBOXING vs HK Luna Short Test More from Mateusz Cholewa →
- Storytripper HD: Harman Kardon Luna vs Luna 2 More from storytripperhd →
- Storytripper HD: Klipsch Nashville vs Harman Kardon Luna vs Soundcore Motion 300
- Storytripper HD: Huawei Sound Joy 2 vs Tribit XSound Plus 2 vs Harman Kardon Luna
- Head-to-Head Comparisons
- Harman Kardon Luna vs Harman Kardon Luna 2
- Harman Kardon Luna vs Bogasing G4
- Harman Kardon Luna vs Bogasing M4
- Harman Kardon Luna vs Tribit Maxsound Plus
- Harman Kardon Luna vs JBL Charge 5 Wifi
- Harman Kardon Luna vs JBL Charge 5
- Harman Kardon Luna vs Tribit Xsound Mega
- Harman Kardon Luna vs Soundcore Boom 3i
- See all 136 comparisons
Ultimate Ears Megaboom 3: $191.99 Amazon $191.99 eBay
Newer model: the Ultimate Ears Megaboom 4, ranked lower, rated 2.1/5, released Jun 2024. See every Ultimate Ears Wonderboom, Boom and Megaboom generation.
Pros: IP67 rated, floats, and survives drops from up to 1 meter. 20 hour battery life: about double most speakers this size. Measured bass extension of 70Hz (-10dB).
Cons: Not stereo, barely any bass. 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 2018. Not technically a 360 speaker, only front and rear.
Full Ultimate Ears Megaboom 3 review and specifications →
| Released | Sep 2018 (8 years ago) |
|---|---|
| App | Yes (UE | BOOM app) |
| Aux Input | No |
| Bass Extension (-10dB) | 70Hz |
| Battery Life | 20 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 4.2 |
| Digital Aux Input | No |
| Dimensions | 3.4” x 8.9” x 3.4” (87 x 225 x 87 mm) |
| Drivers | 2x 50mm fullrange |
| EQ | Yes (App EQ) |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) |
| IP Rating | IPX7 |
| Maximum SPL | 98dB (measured by Alan Ross Reviews) |
| Omnidirectional | Yes |
| Party Mode | Yes (PartyUp up to 50 speakers) |
| Power Input | Micro USB |
| Stereo | No |
| Strap | Yes (built-in loop) |
| TWS | Yes |
| Weight | 2 lbs (925 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Ultimate Ears Megaboom 3 vs LG Xboom Grab
- Ultimate Ears Megaboom 3 vs Ultimate Ears Wonderboom 4
- Ultimate Ears Megaboom 3 vs Ultimate Ears Wonderboom 3
- Ultimate Ears Megaboom 3 vs Soundcore 2
- Ultimate Ears Megaboom 3 vs Ultimate Ears Wonderboom 2
- Ultimate Ears Megaboom 3 vs Tribit Stormbox 2
- Ultimate Ears Megaboom 3 vs Ultimate Ears Wonderboom
- Ultimate Ears Megaboom 3 vs Tribit Xsound Surf
- See all 89 comparisons