These are not really the same size class, and that is the honest framing here. The Harman Kardon Luna 2 ranks #25 of 179 medium speakers by sound quality at $199.95; the Sony ULT Field 5 ranks #59 of 120 large speakers by sound quality at $348.
The Harman Kardon Luna 2 is the lighter choice. A stylish waterproof speaker with clear, spacious mids, tight bass that stays clean at volume, and stereo pairing with a second unit. At 1.6 lbs (735 g) it weighs much less than the Sony ULT Field 5 at 7.3 lbs (3.3 kg). Watch for: Treble can sound bright and edgy, and it loses more output off-axis than some rivals.
The Sony ULT Field 5 is the longer-running pick. A tough, waterproof party speaker with loud, bass focused output, an aux input, a power bank and a long battery. It is rated for 25 hours of battery against 12 for the Harman Kardon Luna 2. It supports LDAC Bluetooth, which the Harman Kardon Luna 2 lacks. It keeps a wired aux input, which the Harman Kardon Luna 2 lacks. Watch for: It prioritizes bass and loudness over fidelity: reviews find the upper mids and highs subdued, with limited stereo separation and soundstage depth.
Buy the Harman Kardon Luna 2 ($199.95) for a medium speaker; the Sony ULT Field 5 ($348) suits a large speaker instead.
Looking for alternatives? See the complete Portable Bluetooth rankings.
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Specifications Side By Side
| Harman Kardon Luna 2 | Sony ULT Field 5 | |
|---|---|---|
| Price | $199.95 | $348.00 |
| Ranked | #25 of 179 in Medium Size Portable Bluetooth Speakers | #59 of 120 in Large Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | Yes |
| Battery Life | 12 hours (Manufacturer specified) | 25 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC, AAC, LDAC |
| EQ | Yes (4 presets + custom) | Yes (App + ULT button) |
| IP Rating | IP67 | IP67 |
| MicroSD Playback | No | - |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| USB Playback | No | - |
| Weight | 1.6 lbs (735 g) | 7.3 lbs (3.3 kg) |
| Bluetooth Version | 5.4 | 5.3 |
| Dimensions | 8.5” x 3.3” x 3.2” (216 x 84 x 81 mm) | 12.6” x 5.7” x 4.9” (320 x 144 x 125 mm) |
| Drivers | 62mm x 82mm woofer with passive radiator, 20mm tweeter | 2x 46mm tweeters + 1x 79mm x 107mm woofer |
| Frequency Response | 58Hz - 20kHz (-6dB) (Manufacturer specified) | - |
| Amplifier Power | 40W (25W woofer + 15W tweeter) | 27W |
| Digital Aux Input | No | No |
| Strap | No | Yes (detachable shoulder strap) |
| Built-in Microphone | - | Yes |
| Party Mode | - | Yes (Party Connect up to 100 speakers) |
| Power Bank | - | Yes (USB-C) |
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