Short answer: the Harman Kardon Luna for the higher ranking, the Sony ULT Field 3 for the lower price. The Harman Kardon Luna ranks #22 of 134 medium speakers at $169.95. The Sony ULT Field 3 ranks #57 at $148, $21.95 cheaper.
What the Harman Kardon Luna gets right: Pretty balanced sound besides the boosted bass. The tradeoff: Not stereo.
On the Sony ULT Field 3 side: IP67 rated, dustproof and water resistant. The tradeoff: Sounds a bit hollow, a bit boosted in the treble.
Buy the Harman Kardon Luna if the ranking matters more than the price. Buy the Sony ULT Field 3 if the price matters more than the ranking.
Specifications Side By Side
| Harman Kardon Luna | Sony ULT Field 3 | |
|---|---|---|
| Price | $169.95 | $148 |
| Ranked | #22 of 134 in Medium Size Portable Bluetooth Speakers | #57 of 134 in Medium Size Portable Bluetooth Speakers |
| App | No | Yes |
| Aux Input | No | No |
| Bass Extension (-10dB) | 57Hz | - |
| Battery Life | 12 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC | SBC, AAC, LDAC |
| EQ | No | Yes (App + ULT button) |
| IP Rating | IP67 | IP67 |
| MicroSD Playback | No | - |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| TWS | Yes | Yes |
| USB Playback | Yes | - |
| Weight | 2.5 lbs / 1.13 kg | 2.6 lbs / 1.2 kg |
| Bluetooth Version | 5.3 | 5.2 |
| Dimensions | 8.3" x 3.1" x 3.1" (210 x 78 x 80 mm) | 10.1" x 4.5" x 3.1" (256 x 113 x 79 mm) |
| Drivers | 48mm x 90mm woofer, 20mm tweeter | 1x 20mm tweeter + 1x 86mm x 46mm woofer |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) | - |
| Output Power | 40W | 27W |
| Built in Microphone | - | Yes |
| Party Mode | - | Yes (Party Connect up to 100 speakers) |
| Power Bank | - | Yes |
The Two Speakers In Full
Harman Kardon Luna: $169.95 Amazon
Pros: Pretty balanced sound besides the boosted bass.
Cons: Not stereo. Boosted bass, not as detailed as higher ranked speakers
| App | No |
|---|---|
| Aux Input | No |
| Bass Extension (-10dB) | 57Hz |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| 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 |
| Output Power | 40W |
| Power Input | USB-C |
| Stereo | No |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 2.5 lbs / 1.13 kg |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Links
Sony ULT Field 3: $148 Amazon
Pros: IP67 rated, dustproof and water resistant. 24 hour battery life. App with 10-band EQ. Party Connect with up to 100 speakers. USB-C in/out for charging your phone.
Cons: Sounds a bit hollow, a bit boosted in the treble.
| App | Yes |
|---|---|
| Aux Input | No |
| Battery Life | 24 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC, LDAC |
| Bluetooth Version | 5.2 |
| Built in Microphone | Yes |
| Dimensions | 10.1" x 4.5" x 3.1" (256 x 113 x 79 mm) |
| Drivers | 1x 20mm tweeter + 1x 86mm x 46mm woofer |
| EQ | Yes (App + ULT button) |
| IP Rating | IP67 |
| Output Power | 27W |
| Party Mode | Yes (Party Connect up to 100 speakers) |
| Power Bank | Yes |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| Weight | 2.6 lbs / 1.2 kg |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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- Links
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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.