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The short answer
Marshall Kilburn III wins this comparison. Choose it if you want the speaker to charge another device. 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
360° sound for picnics and pool days, with a floating body and included carabiner. The app offers EQ controls, while Outdoor Boost adds a dedicated mode for listening outside.
Bettr Score
52/100
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 EVERBOOM | Specification | Marshall Kilburn III |
|---|---|---|
$249.99 ✓ Winner | Reference price | $379.99 |
20 hours | Advertised battery life | 50 hours ✓ Winner |
2.12 lb ✓ 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 EVERBOOM if you want less weight in your bag. Ultimate Ears EVERBOOM weighs 2.12 lb versus 6.17 lb — 4.06 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 20 hours for Ultimate Ears EVERBOOM.
Ultimate Ears EVERBOOM weighs 2.12 lb versus 6.17 lb — 4.06 lb less to carry. Marshall Kilburn III advertises up to 50 hours, versus up to 20 hours for Ultimate Ears EVERBOOM. The recorded reference-price difference is $130.00.
Ultimate Ears EVERBOOM weighs 2.12 lb versus 6.17 lb — 4.06 lb less to carry.
Marshall Kilburn III advertises up to 50 hours, versus up to 20 hours for Ultimate Ears EVERBOOM.
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 EVERBOOM 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.
$160.99
Item + shipping · before tax
$160.99 + $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
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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