Different classes, so treat this as a step-up-or-not question rather than a head-to-head. The JBL Xtreme 3 ranks #18 of 120 large speakers by sound quality at $269.95; the Harman Kardon Luna ranks #26 of 179 medium speakers by sound quality at $290.99.
What the JBL Xtreme 3 does well: 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 lacks. It plays in stereo from a single unit, unlike the Harman Kardon Luna. Watch for: Boosted bass.
The Harman Kardon Luna is the lighter choice. 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 3 at 4 lbs (1.83 kg). The tradeoff: Boosted bass, and less detailed than higher-ranked speakers.
Buy the JBL Xtreme 3 at $269.95 for a large speaker, or the Harman Kardon Luna at $290.99 for a medium 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
| JBL Xtreme 3 | Harman Kardon Luna | |
|---|---|---|
| Price | $269.95 | $290.99 |
| Ranked | #18 of 120 in Large Size Portable Bluetooth Speakers | #26 of 179 in Medium Size Portable Bluetooth Speakers |
| Aux Input | Yes | No |
| Bass Extension (-10dB) | 53Hz | 57Hz |
| 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) | 2.5 lbs (1.13 kg) |
| App | No | No |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Built-in Microphone | Yes | - |
| EQ | No | No |
| IP Rating | IPX7 | IP67 |
| Bluetooth Version | 4.1 | 5.3 |
| Dimensions | 11.7” x 5.4” x 5.3” (298 x 136 x 134 mm) | 8.3” x 3.1” x 3.1” (210 x 78 x 80 mm) |
| Drivers | 2x 70mm woofers, 2x 20mm tweeters | 48mm x 90mm woofer, 20mm tweeter |
| Frequency Response | 53.5Hz - 20kHz (Manufacturer specified) | 60Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | 100W | 40W |
| Digital Aux Input | No | No |
| Strap | Yes (detachable shoulder strap) | - |
| MicroSD Playback | - | No |
| USB Playback | - | Yes |
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