Short answer: the Ultimate Ears Wonderboom 4, though neither ranks well in its class. It ranks #108 of 177 medium speakers by sound quality, rated 2.9/5, at $64.99; the B&O Beosound Explore ranks #142, rated 2.5/5, and costs $294.99, which makes this an easy call rather than a real tradeoff. Both are rated below 3.0/5 among the 177 medium speakers, so if sound quality matters, consider the EarFun Uboom L instead, ranked #2 at $49.79.
The Ultimate Ears Wonderboom 4 is the better-sounding, lighter choice. A small, tough waterproof speaker with a strap loop and USB-C charging, easy to clip on a bag for outdoor trips. At 0.9 lbs (420 g) it weighs noticeably less than the B&O Beosound Explore at 1.4 lbs (631 g). The tradeoff: Bass isn’t as deep as the top-ranked speakers and is a little thuddy.
The B&O Beosound Explore is the longer-running pick. A rugged waterproof speaker with an anodized aluminum design, a strap and carabiner, and a long real world battery. It is rated for 27 hours of battery against 14 for the Ultimate Ears Wonderboom 4. It has an adjustable EQ, which the Ultimate Ears Wonderboom 4 lacks. It plays in stereo from a single unit, unlike the Ultimate Ears Wonderboom 4. Watch for: Huge lack of bass extension compared to competitors, overly hot ringing treble.
Buy the Ultimate Ears Wonderboom 4. It is rated higher for sound quality than the B&O Beosound Explore and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Looking for alternatives? See the complete Portable Bluetooth rankings.
A small, tough waterproof speaker with a strap loop and USB-C charging, easy to clip on a bag for outdoor trips.
A rugged waterproof speaker with an anodized aluminum design, a strap and carabiner, and a long real world battery.
Prices on this page were last checked October 31, 2026 at 7:11 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
| Ultimate Ears Wonderboom 4 | B&O Beosound Explore | |
|---|---|---|
| Price | $64.99 | $294.99 |
| Ranked | #108 of 177 in Medium Size Portable Bluetooth Speakers | #142 of 177 in Medium Size Portable Bluetooth Speakers |
| Battery Life | 14 hours (Manufacturer specified) | 27 hours (Manufacturer specified) |
| Maximum SPL | 87dB (Manufacturer specified) | 91dB (Manufacturer specified) |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | Yes | No |
| Weight | 0.9 lbs (420 g) | 1.4 lbs (631 g) |
| IP Rating | IP67 | IP67 |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.2 | 5.2 |
| Dimensions | 4.1” x 3.8” (104 x 95.3 mm) | 3.2” x 4.9” x 3.2” (81 x 124 x 81 mm) |
| Drivers | 2x 40mm active drivers + 2x passive radiators (46.1 x 65.2mm) | 2x 1.8” (46mm) full-range drivers |
| TWS | Yes | Yes |
| Party Mode | No | - |
| App | No | Yes (Bang & Olufsen app) |
| EQ | No | Yes (App EQ) |
| Built-in Microphone | No | No |
| Power Bank | No | No |
| Aux Input | No | No |
| Digital Aux Input | No | Yes (USB-C) |
| Bluetooth Codecs | SBC | SBC |
| Strap | Yes (built-in loop) | Yes (carabiner) |
| Bass Extension (-10dB) | - | ~70Hz |
| Amplifier Power | - | 60W |
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