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The short answer
Sony ULT FIELD 3 wins this comparison. Choose it if a lower purchase price is your priority. Sony ULT FIELD 3 has the lower recorded reference price: $209.99 versus $379.99, a $170.00 difference.
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
Sony
Press the ULT button for a bass boost, then carry it by the included shoulder strap. IP67 protection, phone charging and up to 24 hours of playtime suit days out.
Bettr Score
68.8/100
| Marshall Kilburn III | Specification | Sony ULT FIELD 3 |
|---|---|---|
$379.99 | Reference price | $209.99 ✓ Winner |
50 hours ✓ Winner | Advertised battery life | 24 hours |
6.17 lb | Weight | 2.65 lb ✓ Winner |
IP54 | Ingress protectionPersonal preference | IP67 |
2 | Durability tier | 4 ✓ Winner |
5.3 | Bluetooth versionPersonal preference | 5.2 |
Yes | Can charge another deviceTie | Yes |
No | USB audio inputNot enough data | Not stated / not applicable |
Yes | Auracast or compatible broadcast pairingNot enough data | Not stated / not applicable |
No | Floats in waterNot enough data | Not stated / not applicable |
No | Speakerphone | Yes ✓ Winner |
The buying advice
Choose Marshall Kilburn III if a longer advertised playtime matters. Marshall Kilburn III advertises up to 50 hours, versus up to 24 hours for Sony ULT FIELD 3.
Choose Sony ULT FIELD 3 if you want less weight in your bag. Sony ULT FIELD 3 weighs 2.65 lb versus 6.17 lb — 3.52 lb less to carry.
Marshall Kilburn III advertises up to 50 hours, versus up to 24 hours for Sony ULT FIELD 3. Sony ULT FIELD 3 weighs 2.65 lb versus 6.17 lb — 3.52 lb less to carry. The recorded reference-price difference is $170.00.
Marshall Kilburn III advertises up to 50 hours, versus up to 24 hours for Sony ULT FIELD 3.
Sony ULT FIELD 3 weighs 2.65 lb versus 6.17 lb — 3.52 lb less to carry.
Sony ULT FIELD 3 has the lower recorded reference price: $209.99 versus $379.99, a $170.00 difference.
Sony ULT FIELD 3 supports speakerphone calls; the other speaker’s verified specification says it does not.
People's Pick
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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
eBay — New
In stock · checked Oct 30, 2026
Price needs rechecking. Confirm at the retailer.
$100.00
Item price · shipping unknown
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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