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The short answer
Ultimate Ears WONDERBOOM 4 wins this comparison. Choose it if you want less weight in your bag. Ultimate Ears WONDERBOOM 4 weighs 14.82 oz versus 6.17 lb — 5.25 lb less to carry. Its recorded reference price is $280.00 lower.
Ultimate Ears
A small poolside speaker that floats, with 360° playback and up to 14 hours of battery life. Outdoor Boost and Podcast Mode cover music outside and spoken audio.
Bettr Score
63.8/100
Marshall
Long weekends between charges are its main draw: 50+ hours of playtime, plus phone charging. Bass and treble knobs give hands-on control, though the 6.17 lb body is substantial.
Bettr Score
58.8/100
| Ultimate Ears WONDERBOOM 4 | Specification | Marshall Kilburn III |
|---|---|---|
$99.99 ✓ Winner | Reference price | $379.99 |
14 hours | Advertised battery life | 50 hours ✓ Winner |
14.82 oz ✓ Winner | Weight | 6.17 lb |
IP67 | Ingress protectionPersonal preference | IP54 |
4 ✓ Winner | Durability tier | 2 |
5.2 | Bluetooth versionPersonal preference | 5.3 |
No | Can charge another device | Yes ✓ Winner |
No | USB audio inputTie | No |
No | Auracast or compatible broadcast pairing | Yes ✓ Winner |
Yes ✓ Winner | Floats in water | No |
No | SpeakerphoneTie | No |
The buying advice
Choose Ultimate Ears WONDERBOOM 4 if you want less weight in your bag. Ultimate Ears WONDERBOOM 4 weighs 14.82 oz versus 6.17 lb — 5.25 lb less to carry.
Choose Marshall Kilburn III if a longer advertised playtime matters. Marshall Kilburn III advertises up to 50 hours, versus up to 14 hours for Ultimate Ears WONDERBOOM 4.
Ultimate Ears WONDERBOOM 4 weighs 14.82 oz versus 6.17 lb — 5.25 lb less to carry. Marshall Kilburn III advertises up to 50 hours, versus up to 14 hours for Ultimate Ears WONDERBOOM 4. The recorded reference-price difference is $280.00.
Ultimate Ears WONDERBOOM 4 weighs 14.82 oz versus 6.17 lb — 5.25 lb less to carry.
Marshall Kilburn III advertises up to 50 hours, versus up to 14 hours for Ultimate Ears WONDERBOOM 4.
Marshall Kilburn III can charge another device from its battery; the other speaker’s verified specification says it cannot. Charging a phone uses some of the speaker’s battery.
Ultimate Ears WONDERBOOM 4 is specified to float; the other speaker is specified not to. Follow the manufacturer’s water-use instructions.
People's Pick
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eBay — New
In stock · checked Oct 30, 2026
Price needs rechecking. Confirm at the retailer.
$58.49
Item + shipping · before tax
$58.49 + $0.00 shipping
We may earn a commission when you buy through links marked “Affiliate link.” This does not change your price or our scores. How we earn
eBay — New
In stock · checked Oct 30, 2026
Price needs rechecking. Confirm at the retailer.
$349.99
Item + shipping · before tax
$349.99 + $0.00 shipping
We may earn a commission when you buy through links marked “Affiliate link.” This does not change your price or our scores. How we earn
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