Different classes, so treat this as a step-up-or-not question rather than a head-to-head. The Harman Kardon Luna ranks #26 of 179 medium speakers by sound quality at $290.99; the JBL Xtreme 4 ranks #43 of 120 large speakers by sound quality at $309.95.
The Harman Kardon Luna is the lighter pick. A fully waterproof speaker with fairly balanced, bass rich sound, a separate tweeter, and stereo pairing with a second unit. At 2.5 lbs (1.13 kg) it weighs much less than the JBL Xtreme 4 at 4.6 lbs (2.1 kg). The catch: Boosted bass, and less detailed than higher-ranked speakers.
The JBL Xtreme 4 is the longer-running choice. A rugged, waterproof speaker with clear, punchy sound, a swappable battery, a power bank and excellent real world battery life. It is rated for 24 hours of battery against 12 for the Harman Kardon Luna. It has an adjustable EQ, which the Harman Kardon Luna lacks. It plays in stereo from a single unit, unlike the Harman Kardon Luna. The catch: It cannot produce the deep rumble of a larger speaker, and bass compression increases near maximum volume.
Buy the Harman Kardon Luna at $290.99 for a medium speaker, or the JBL Xtreme 4 at $309.95 for a large speaker instead.
Want more options? Browse the full Portable Bluetooth rankings.
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Specifications Side By Side
| Harman Kardon Luna | JBL Xtreme 4 | |
|---|---|---|
| Price | $290.99 | $309.95 |
| Ranked | #26 of 179 in Medium Size Portable Bluetooth Speakers | #43 of 120 in Large 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 | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| EQ | No | Yes (5 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 | Yes | - |
| Weight | 2.5 lbs (1.13 kg) | 4.6 lbs (2.1 kg) |
| Bluetooth Version | 5.3 | 5.3 |
| Dimensions | 8.3” x 3.1” x 3.1” (210 x 78 x 80 mm) | 11.7” x 5.9” x 5.6” (297 x 149 x 141 mm) |
| Drivers | 48mm x 90mm woofer, 20mm tweeter | 2x 70mm woofers, 2x 19mm tweeters + 2x passive radiators |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) | 44Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | 40W | 100W |
| Digital Aux Input | No | No |
| Bluetooth Latency | - | 220ms |
| Maximum SPL | - | 106dB (measured by Alan Ross Reviews) |
| Party Mode | - | Yes (Auracast) |
| Power Bank | - | Yes (USB-C) |
| Removable Battery | - | Yes |
| Built-in Microphone | - | Yes |
| Strap | - | Yes (detachable shoulder strap) |
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