Different classes, so treat this as a step-up-or-not question rather than a head-to-head. The Sony ULT Field 5 ranks #59 of 120 large speakers by sound quality at $348; the Marshall Emberton III ranks #126 of 179 medium speakers by sound quality at $179.99.
What the Sony ULT Field 5 does well: A tough, waterproof party speaker with loud, bass focused output, an aux input, a power bank and a long battery. It supports LDAC Bluetooth, which the Marshall Emberton III lacks. It keeps a wired aux input, which the Marshall Emberton III lacks. Watch for: It prioritizes bass and loudness over fidelity: reviews find the upper mids and highs subdued, with limited stereo separation and soundstage depth.
The Marshall Emberton III is the lighter option. A tough waterproof speaker with Marshall styling and a very long battery, plus quick charging. At 1.5 lbs (673 g) it weighs much less than the Sony ULT Field 5 at 7.3 lbs (3.3 kg). The catch: Strange unnatural echo-like sound coloration, bass not as deep as competitors.
Buy the Sony ULT Field 5 at $348 for a large speaker, or the Marshall Emberton III at $179.99 for a medium speaker instead.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Prices on this page were last checked November 11, 2026 at 3:26 AM 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
| Sony ULT Field 5 | Marshall Emberton III | |
|---|---|---|
| Price | $348.00 | $179.99 |
| Ranked | #59 of 120 in Large Size Portable Bluetooth Speakers | #126 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | Yes | No |
| Battery Life | 25 hours (Manufacturer specified) | 32 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC, LDAC | SBC |
| Bluetooth Version | 5.3 | 5.3 |
| Built-in Microphone | Yes | Yes |
| Dimensions | 12.6” x 5.7” x 4.9” (320 x 144 x 125 mm) | 6.3” x 2.7” x 3” (160 x 68 x 76 mm) |
| Drivers | 2x 46mm tweeters + 1x 79mm x 107mm woofer | 2x 2” full-range cone drivers + 2x 2” passive radiators |
| EQ | Yes (App + ULT button) | Yes (3 presets via app) |
| IP Rating | IP67 | IP67 |
| Party Mode | Yes (Party Connect up to 100 speakers) | Yes (Marshall Stack) |
| Power Bank | Yes (USB-C) | No |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | Yes |
| TWS | Yes | No |
| Weight | 7.3 lbs (3.3 kg) | 1.5 lbs (673 g) |
| Amplifier Power | 27W | 20W |
| Digital Aux Input | No | No |
| Strap | Yes (detachable shoulder strap) | No |
| Bass Extension (-10dB) | - | 62Hz |
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