These sit in different size classes, so this is not a straight ranking comparison. The Harman Kardon Luna 2 ranks #25 of 179 medium speakers by sound quality at $199.95; the JBL Xtreme 4 ranks #43 of 120 large speakers by sound quality at $309.95.
The Harman Kardon Luna 2 is the lighter pick. 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 JBL Xtreme 4 at 4.6 lbs (2.1 kg). The catch: Treble can sound bright and edgy, and it loses more output off-axis than some rivals.
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 2. It plays in stereo from a single unit, unlike the Harman Kardon Luna 2. The tradeoff: It cannot produce the deep rumble of a larger speaker, and bass compression increases near maximum volume.
Buy the Harman Kardon Luna 2 at $199.95 if you want a medium speaker. Buy the JBL Xtreme 4 at $309.95 if you want a large speaker instead.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Prices on this page were last checked November 7, 2026 at 7:34 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.
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Specifications Side By Side
| Harman Kardon Luna 2 | JBL Xtreme 4 | |
|---|---|---|
| Price | $199.95 | $309.95 |
| Ranked | #25 of 179 in Medium Size Portable Bluetooth Speakers | #43 of 120 in Large Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | No |
| Battery Life | 12 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| EQ | Yes (4 presets + custom) | 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 | No | - |
| Weight | 1.6 lbs (735 g) | 4.6 lbs (2.1 kg) |
| Bluetooth Version | 5.4 | 5.3 |
| Dimensions | 8.5” x 3.3” x 3.2” (216 x 84 x 81 mm) | 11.7” x 5.9” x 5.6” (297 x 149 x 141 mm) |
| Drivers | 62mm x 82mm woofer with passive radiator, 20mm tweeter | 2x 70mm woofers, 2x 19mm tweeters + 2x passive radiators |
| Frequency Response | 58Hz - 20kHz (-6dB) (Manufacturer specified) | 44Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | 40W (25W woofer + 15W tweeter) | 100W |
| Digital Aux Input | No | No |
| Strap | No | Yes (detachable shoulder strap) |
| 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 |
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