Short answer: the Harman Kardon Luna 2 for sound, the Ultimate Ears Wonderboom 4 only for size. The Wonderboom 4 is small, but its bass is not as deep as the top-ranked speakers and is a little thuddy, and it adds little over the Wonderboom 3 beyond a USB-C port. The Luna 2 is the fuller-sounding speaker with tight, well-controlled bass from its 62mm x 82mm woofer and passive radiator, at $199.95 against $74.50.
Buy the Harman Kardon Luna 2. It is rated higher for sound quality, and saving $125.45 with the Ultimate Ears Wonderboom 4 does not make up for the sound-quality gap.
Want more options? Browse the full Portable Bluetooth rankings.
Articulate, spacious midrange with precise imaging and instrument separation.
Amazon $199.95 B&H Photo Video $199.95 eBay
A small 420 g IP67 waterproof 360 degree speaker with 14-hour battery life and a built-in strap loop.
Amazon $74.50 eBayPrices on this page were last checked October 15, 2026 at 5:41 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 | Ultimate Ears Wonderboom 4 | |
|---|---|---|
| Price | $199.95 | $74.50 |
| Ranked | #25 of 172 in Medium Size Portable Bluetooth Speakers | #106 of 172 in Medium Size Portable Bluetooth Speakers |
| App | Yes | No |
| Aux Input | No | No |
| Battery Life | 12 hours (Manufacturer specified) | 14 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| EQ | Yes (4 presets + custom) | No |
| IP Rating | IP67 | IP67 |
| MicroSD Playback | No | - |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Omnidirectional | No | Yes |
| TWS | Yes | Yes |
| USB Playback | No | - |
| Weight | 1.6 lbs (735 g) | 0.9 lbs (420 g) |
| Bluetooth Version | 5.4 | 5.2 |
| Dimensions | 8.5” x 3.3” x 3.2” (216 x 84 x 81 mm) | 4.1” x 3.8” (104 x 95.3 mm) |
| Drivers | 62mm x 82mm woofer with passive radiator, 20mm tweeter | 2x 40mm active drivers + 2x passive radiators (46.1 x 65.2mm) |
| Frequency Response | 58Hz - 20kHz (-6dB) (Manufacturer specified) | - |
| Amplifier Power | 40W (25W woofer + 15W tweeter) | - |
| Digital Aux Input | No | No |
| Strap | No | Yes (built-in loop) |
| Maximum SPL | - | 87dB (Manufacturer specified) |
| Party Mode | - | No |
| Built-in Microphone | - | No |
| Power Bank | - | No |
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