Short answer: the Harman Kardon Luna 2. It ranks #25 of 172 medium speakers by sound quality (rated 4.1/5) at $199.95 and is still sold new; the Sony XB33 ranks #73 (rated 3.4/5) and is discontinued, so it is only an option used. The Sony XB33’s replacement, the Sony ULT Field 3, is rated 3.4/5 at $208.
The Harman Kardon Luna 2 is the better-sounding, lighter pick. Articulate, spacious midrange with precise imaging and instrument separation. At 1.6 lbs (735 g) it weighs noticeably less than the Sony XB33 at 2.4 lbs (1.1 kg). The catch: Treble can sound bright and edgy, and it loses more output off-axis than some rivals.
The Sony XB33 is the longer-running option. A lightweight 2.4 lbs (1.1 kg) IP67 speaker with about 19 hours of real-world battery, app-controlled LED lighting and Party Connect for up to 100 speakers. It is rated for 24 hours of battery against 12 for the Harman Kardon Luna 2. It supports LDAC Bluetooth, which the Harman Kardon Luna 2 lacks. It plays in stereo from a single unit, unlike the Harman Kardon Luna 2. The catch: Not very loud.
Buy the Harman Kardon Luna 2. It is rated higher for sound quality and still sold new, while the Sony XB33 is discontinued.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Articulate, spacious midrange with precise imaging and instrument separation.
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Specifications Side By Side
| Harman Kardon Luna 2 | Sony XB33 | |
|---|---|---|
| Price | $199.95 | $110 Discontinued |
| Ranked | #25 of 172 in Medium Size Portable Bluetooth Speakers | #73 of 172 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes (Sony Music Connect App) |
| Aux Input | No | No |
| Battery Life | 12 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC, AAC, LDAC |
| EQ | Yes (4 presets + custom) | Yes (3 band) |
| 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) | 2.4 lbs (1.1 kg) |
| Bluetooth Version | 5.4 | 5.0 |
| Dimensions | 8.5” x 3.3” x 3.2” (216 x 84 x 81 mm) | 9.7” x 3.8” x 4.2” (246 x 97 x 106 mm) |
| Drivers | 62mm x 82mm woofer with passive radiator, 20mm tweeter | 2x 48x70mm X-Balanced racetrack drivers + 2x passive radiators |
| Frequency Response | 58Hz - 20kHz (-6dB) (Manufacturer specified) | - |
| Amplifier Power | 40W (25W woofer + 15W tweeter) | 16W RMS |
| Digital Aux Input | No | No |
| Strap | No | - |
| Bass Extension (-10dB) | - | 50Hz |
| Bluetooth Latency | - | 110ms |
| Maximum SPL | - | 97dB (measured by Alan Ross Reviews) |
| Party Mode | - | Yes (Party Connect up to 100 speakers) |
| Power Bank | - | Yes (USB-A) |
| Lights | - | Yes |
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