These are not really the same size class, and that is the honest framing here. The JBL Xtreme 3 ranks #18 of 120 large speakers by sound quality at $269.95; the Harman Kardon Luna 2 ranks #25 of 179 medium speakers by sound quality at $199.95.
The case for the JBL Xtreme 3: A loud, waterproof stereo speaker with deep bass, balanced sound and a power bank for charging devices. It keeps a wired aux input, which the Harman Kardon Luna 2 lacks. It plays in stereo from a single unit, unlike the Harman Kardon Luna 2. Watch for: Boosted bass.
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 3 at 4 lbs (1.83 kg). It has an adjustable EQ, which the JBL Xtreme 3 lacks. Watch for: Treble can sound bright and edgy, and it loses more output off-axis than some rivals.
Buy the JBL Xtreme 3 at $269.95 if you want a large speaker. Buy the Harman Kardon Luna 2 at $199.95 if you want a medium speaker instead.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
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
| JBL Xtreme 3 | Harman Kardon Luna 2 | |
|---|---|---|
| Price | $269.95 | $199.95 |
| Ranked | #18 of 120 in Large Size Portable Bluetooth Speakers | #25 of 179 in Medium Size Portable Bluetooth Speakers |
| Aux Input | Yes | No |
| Bass Extension (-10dB) | 53Hz | - |
| Battery Life | 15 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| Bluetooth Latency | 133ms | - |
| Maximum SPL | 105dB (measured by Alan Ross Reviews) | - |
| Party Mode | Yes (PartyBoost up to 100 speakers) | - |
| Power Bank | Yes (USB-A + USB-C) | - |
| Power Input | USB-C | USB-C |
| Stereo | Yes | No |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 4 lbs (1.83 kg) | 1.6 lbs (735 g) |
| App | No | Yes |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Built-in Microphone | Yes | - |
| EQ | No | Yes (4 presets + custom) |
| IP Rating | IPX7 | IP67 |
| Bluetooth Version | 4.1 | 5.4 |
| Dimensions | 11.7” x 5.4” x 5.3” (298 x 136 x 134 mm) | 8.5” x 3.3” x 3.2” (216 x 84 x 81 mm) |
| Drivers | 2x 70mm woofers, 2x 20mm tweeters | 62mm x 82mm woofer with passive radiator, 20mm tweeter |
| Frequency Response | 53.5Hz - 20kHz (Manufacturer specified) | 58Hz - 20kHz (-6dB) (Manufacturer specified) |
| Amplifier Power | 100W | 40W (25W woofer + 15W tweeter) |
| Digital Aux Input | No | No |
| Strap | Yes (detachable shoulder strap) | No |
| MicroSD Playback | - | No |
| USB Playback | - | No |
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