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The short answer
Sony ULT FIELD 5 wins this comparison. Choose it if a lower purchase price is your priority. Sony ULT FIELD 5 has the lower recorded reference price: $349.99 versus $379.99, a $30.00 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
Two bass-boost settings let you dial up the low end for parties. A shoulder strap helps carry its 7.28 lb body; IP67 protection and up to 25 hours of playtime suit outdoor listening.
Bettr Score
61/100
| Marshall Kilburn III | Specification | Sony ULT FIELD 5 |
|---|---|---|
$379.99 | Reference price | $349.99 ✓ Winner |
50 hours ✓ Winner | Advertised battery life | 25 hours |
6.17 lb ✓ Winner | Weight | 7.28 lb |
IP54 | Ingress protectionPersonal preference | IP67 |
2 | Durability tier | 4 ✓ Winner |
5.3 | Bluetooth versionTie | 5.3 |
Yes | Can charge another deviceTie | Yes |
No | USB audio inputTie | No |
Yes | Auracast or compatible broadcast pairingNot enough data | Not stated / not applicable |
No | Floats in waterNot enough data | Not stated / not applicable |
No | SpeakerphoneNot enough data | Not stated / not applicable |
The buying advice
Choose Marshall Kilburn III if a longer advertised playtime matters. Marshall Kilburn III advertises up to 50 hours, versus up to 25 hours for Sony ULT FIELD 5.
Choose Sony ULT FIELD 5 if a lower purchase price is your priority. Sony ULT FIELD 5 has the lower recorded reference price: $349.99 versus $379.99, a $30.00 difference.
Marshall Kilburn III advertises up to 50 hours, versus up to 25 hours for Sony ULT FIELD 5. Sony ULT FIELD 5 has the lower recorded reference price: $349.99 versus $379.99, a $30.00 difference.
Marshall Kilburn III advertises up to 50 hours, versus up to 25 hours for Sony ULT FIELD 5.
Sony ULT FIELD 5 has the lower recorded reference price: $349.99 versus $379.99, a $30.00 difference.
Marshall Kilburn III weighs 6.17 lb versus 7.28 lb — 1.1 lb less to carry.
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.
$225.00
Item + shipping · before tax
$225.00 + $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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