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 okay for music. With the 'ULT Power Sound' enabled, it has impressively low-bass extension for its size, which can help you feel the four-on-the-floor thud of house tracks. The mid-range is balanced and detailed, and there's some sparkle to the treble range to help bring out vocals and stringed instruments. That said, the dynamics performance is disappointing: the speaker is no louder than its smaller siblings and compresses a fair bit at max volume. You're also limited to mono playback with limited directivity, so you'll need to ensure you're positioned in front of the speaker to hear everything. 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 mediocre for videos and movies. It has a 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's capable of rendering earthshaking sound effects with some panache, especially given its size. iOS latency is excellent, but it fares worse with Android devices, so you may notice the odd lip-sync mismatch. This speaker falls short when it comes to dynamics, though, as it doesn't get particularly loud and compresses the bass range at max volume. 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.
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. Unfortunately, it doesn't get too loud, though this shouldn'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, and it won't get loud 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
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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.
- Updated Jun 02, 2025: Review published.
- Updated May 23, 2025: Early access published.
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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, better voice assistant support, and a more balanced sound profile. 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. The frequency response is more balanced than previous Sony speaker lines, though, and the ULT FIELD 3 has a more articulate and open treble range than the Sony SRS-XE300. 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. While its bass range doesn't extend as low as the Sony's, it can get louder and compresses less at max volume, 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 that their directivity isn't the best. That said, the Sony's frequency response extends a little lower with the 'ULT' button engaged, which will please bassheads. If it's volume 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's voice assistant integration and better latency performance—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 regards, with the key points of differentiation coming in the form of 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. The ULT FIELD 3 also has a better bass response, bringing out big kicks in genres like house and techno. When it comes to portability, it's hard to argue with the ULT FIELD 1's compact size, though. Despite being smaller, it can also achieve a higher 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, similarly long battery life, and balanced frequency response. On the other hand, it comes with compromises, because out of the two, only the ULT FIELD 5 works in stereo, and it can get much louder with a better soundstage and less compression. 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 the more portable of the two, the Sony performs better in most other regards. 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 has a much more balanced 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.
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