The Sony ULT FIELD 3 is a 2025 mid-range addition to the brand's ULT Power Sound lineup. As with its sibling speakers, it features the eponymous 'ULT' button, which supercharges the bass response. It's designed for on-the-go use, with a very portable design that makes it easy to place in a bag and head to the park. There's also a carrying strap included if you prefer to sling it over your shoulder. The manufacturer advertises an impressive 24-hour battery life for all-day playback; plus, it boasts an array of pairing options to bring other ULT Power Sound speakers into the party.
Our Verdict
The Sony ULT FIELD 3 is acceptable for music. It has a fairly balanced sound overall, though it doesn't reproduce much low or mid-bass. That means bass-heavy genres like EDM and hip-hop won't sound particularly impactful, but there's some extra warmth in the high-bass to keep basslines audible. The rest of the response is well-balanced, so voices and higher-pitched instruments are reproduced well. It does a decent job of getting loud, but you're limited to mono playback with disappointing directivity, so you'll need to ensure you're positioned in front of the speaker to hear the best sound. At least you can dial in a custom EQ preset using the 7-band graphic EQ in the app or choose from the selection of EQ presets to change up the sound.
Long, 14.5-hour battery life with battery extension features.
7-band graphic EQ in the app.
Downmixes stereo content to mono.
Doesn't get very loud, compresses at max volume.
The Sony ULT FIELD 3 is sub-par for videos and movies. It has a fairly balanced sound with the 'ULT Power Sound' EQ engaged and comes with a room correction feature to tailor the sound to your space. While the bass output isn't comparable to that of a discrete subwoofer, it also doesn't reproduce much low or mid-bass, so action-heavy scenes lack deep thump and rumble. It does a decent job of getting loud, though there's some compression at max volume, so bass-range content loses some punch. iOS latency is excellent, but it fares worse with Android devices, so you may notice the odd lip-sync mismatch. It also can't play back stereo content without downmixing to mono, so it won't track stereo sound objects from left to right.
7-band graphic EQ in the app.
Latency with Android devices on the higher side.
Doesn't get very loud, compresses at max volume.
The Sony ULT FIELD 3 is a good choice for podcasts. It reproduces mid-range frequencies, where voices sit in the mix, very clearly. It's an extremely portable speaker that lets you bring your favorite podcast with you wherever you go; you can even sling it over your shoulder. It does a decent job of getting loud, though this won't be an issue if you plan on using it primarily at home. Its directivity isn't the best either, but you should still hear podcast hosts' voices clearly so long as you aren't behind the speaker or perpendicular to it.
Long, 14.5-hour battery life with battery extension features.
Lightweight and portable design, with carrying strap.
Doesn't get very loud, compresses at max volume.
The Sony ULT FIELD 3 is acceptable for voice assistant use. Its usefulness in this regard hinges on whether you own a Siri or Google Assistant-compatible device, as there's no built-in voice assistant integration. That said, when paired with a compatible iOS or Android device, it does an excellent job of picking up your voice commands. Even in crowded spaces or from across the room, the built-in mic can distinguish what you're saying, avoiding any miscommunications.
Excellent voice recognition.
No built-in voice assistant capabilities.
The Sony ULT FIELD 3 is good for outdoor use. Its compact and lightweight frame makes it easy to stow in a small bag, and you can attach the included strap to sling it over a shoulder. Its IP67 rating means it can survive an unexpected dip in the pool, and its impact protection also means it can put up with being dropped from hand height, too. With almost 15 hours of battery life, this speaker can soundtrack the longest of summer park hangs without needing a recharge, and you can always extend the fun further with 'Stamina Mode.' Its front-facing design doesn't offer the best directivity, though. It does a decent job of getting loud, but it won't be enough to soundtrack a full-blown outdoor rager.
Long, 14.5-hour battery life with battery extension features.
IP67 rating protects against dust and water submersion.
Lightweight and portable design, with carrying strap.
Doesn't get very loud, compresses at max volume.
Changelog
- Updated Jul 28, 2026: This review has been updated to Test Bench 1.0.1. This includes the Test Bench 1.0 updates to all of our Sound tests: Frequency Response Accuracy, Raw Frequency Response, Directivity, and Loudness, as well as the revised Low-Frequency Extension calculation and related DRC updates introduced in Test Bench 1.0.1. There have also been text changes throughout the review, including to the usages and product comparisons, where applicable, to match these results. You can read more about these changes in our Test Bench 1.0 changelog and Test Bench 1.0.1 changelog.
- Updated Jul 13, 2026: This review has been updated to Test Bench 1.0, which includes new results for all of our Sound tests: Frequency Response Accuracy, Raw Frequency Response, Directivity, and Loudness. There have also been text changes made throughout the review, including to the usages and product comparisons, to match these results. You can read more about these changes in our changelog.
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Updated Jan 08, 2026:
The Dynamics box of this review has been updated with a comparison to the LG xboom Bounce.
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Updated Jun 27, 2025:
The Soundstage section was updated to mention the Sony ULT FIELD 5.
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Differences Between Sizes And Variants
The Sony ULT FIELD 3 comes in three color variants: 'Off White,' 'Forest Gray,' and 'Black,' and here's a picture of its label. If you encounter another variant, please let us know in the comments, and we'll update our review.
Popular Speaker Comparisons
The Sony ULT FIELD 3 is a 2025 portable speaker, positioned in the middle of the ULT Power Sound speaker line, both in terms of price and features. It's not quite as portable as the Sony ULT FIELD 1 but boasts a much longer battery life and better voice assistant support. Rather disappointingly, it has a similar max volume to the smaller speaker, though, so the ULT FIELD 3 isn't worth the outlay if volume is your primary buying criterion. This speaker faces stiff competition from brand offerings by the likes of JBL, which have been refining their portable speakers across many generations. The JBL Charge 6, for example, is a similarly portable and better-built mono speaker with a comparable battery life. The JBL can also get louder and compresses less at max volume than the ULT FIELD 3, which is beneficial for those times when you want the sound to carry outdoors.
See also our recommendations for the best Bluetooth speakers, the best portable Bluetooth speakers, and the best waterproof Bluetooth speakers.
The Sony ULT FIELD 3 and the JBL Charge 6 are both portable and well-built mono speakers. They each have their strengths, but ultimately, either would be a solid choice if you need a lightweight speaker for outdoor or around-the-house use. Both speakers downmix stereo audio to mono, and their front-facing designs mean their directivity isn't the best. If it's loudness you're after, the JBL can output a bit more at max volume, and it won't compress as much as the Sony either. They're neck and neck on battery life, too, and either will get you through an all-day BBQ at a minimum. The deciding factor might come in the form of the Sony speaker's voice assistant integration and better latency performance, which is a real boon if you plan on using the hands-free commands or pairing the speaker for movie use.
The Sony ULT FIELD 1 is the Sony ULT FIELD 3's little sibling. While both are very portable speakers, the ULT FIELD 1 is about half the weight and features a canister-like design, in contrast to the ULT FIELD 3's rectangular edges. Both speakers are well-built and feature carrying straps for easy transportation. They perform similarly in most respects, with the key points of differentiation being battery life and voice assistant capabilities, where the ULT FIELD 3 comes out on top. With 14.5 hours of battery life and Siri and Google Assistant compatibility (when paired with a compatible phone), it can take voice commands all day long. But when it comes to portability, it's hard to argue with the ULT FIELD 1's compact size. Despite being smaller, it can also achieve a similar max volume, which defies expectations.
Choosing between the Sony ULT FIELD 5 and the Sony ULT FIELD 3 depends on how much you value portability. While there are pros and cons to both speakers, the main appeal of the ULT FIELD 3 is its smaller size and similarly long battery life. On the other hand, it comes with compromises: of the two, only the ULT FIELD 5 works in stereo, and it can get much louder while delivering more bass. Otherwise, both are well-built with IP67 ratings, and they use the same app.
The JBL Flip 6 and the Sony ULT FIELD 3 are both portable mono speakers. While the JBL is more portable, the Sony performs better in most other respects. Weighing in at 0.5 kg, the JBL is small and lightweight enough to slip into a deep coat pocket, whereas the Sony might require a backpack or tote bag. The Sony speaker has a flatter default sound, though, with a more prominent bass and a much longer continuous battery life. It also has voice assistant integration if you own an Apple or Android device. The JBL has slightly better directivity, though, and compresses less at max volume. This makes it a better choice if you're unfussed about the sound and want a simple, portable speaker to play podcasts or music on while you explore the outdoors.
Test Results
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