I reviewed the Sony ULT Field 3 Bluetooth speaker and it left me disappointed, for one key reason

Sony ULT Field 3: two-minute review

The Sony ULT Field 3 is one of the latest portable Bluetooth speakers to enter a market stuffed to the gills with options. This one promises “impressive power”, “easy portability” and a build quality that'll play your music “anywhere, in any weather”. But with rivals such as JBL and Ultimate Ears going all-in on the whole rough-and-ready portable speaker thing, it begs the question… can Sony outdo its red-hot rivals?

At a glance, you may well think so. This speaker is packed with a ton of features. We’ve got multi-point, customizable EQ, environment optimization and, of course, ULT mode for enhanced bass output. That’s all very neat, and as always, Sony has done a great job with its Sound Connect app, which enables you to access all of these features and more.

This is also a highly durable speaker, with excellent build quality, IP67 dust and waterproofing and an adjustable strap, meaning it’s easy to transport and play in any environment. But, in order to outdo the best Bluetooth speakers around, the thing that truly matters in my book is sound quality.

Unfortunately for the Field 3, this is the one key reason that it fails to stake its claim as a class-leading option. Even with ULT mode on, which plays to the speaker’s strengths – beefy low-end output – you’ll notice significant compression at higher volumes, some harshness in the treble range and a slight lack of nuance.

Even if you want a more balanced listen, the ULT-off tuning simply didn’t cut it in my experience. You can achieve decent audio using the Sound Connect app’s seven-band equalizer, but still, you can’t expect well-separated, perfectly balanced audio.

And given the list price of this speaker – just under $200 / £180 / AU$330 – I think that middling sound quality is pretty disappointing. Some issues, like limited bass extension and mono-only sound (unless you pair to a second Field 3 model) are typical for a speaker of this size – but I’d still expect clearer, more controlled audio from a Sony product at this cost.

Again, a serviceable listen is certainly achievable on the Field 3. But some aspects are more than serviceable. More than anything, that includes battery life, which is very good for a speaker in this weight class. You get up to 24 hours with ULT on – admittedly not playing at high volume, though. Still, the Field 3 should have plenty of juice to last a long listening session, and it can even charge external devices with its USB-C port – which is a most welcome inclusion.

When all’s said and done, the Sony ULT Field 3 has some strong qualities, but just doesn’t have enough sauce to stand out in a talented crowd. Perhaps if it gets a juicy price cut in sales events I’d be able to say it’s worth checking out. But for the moment, I’d suggest looking elsewhere for a summer-ready Bluetooth speaker. Other models, such as the JBL Charge 5 or even the smaller, yet Wi-Fi-enabled Sonos Roam 2 would be better picks, just to name a couple.

Sony ULT Field 3 review: price and release date

• $199 / £179 / AU$329
• Launched in April 2025

The Sony ULT Field 3 launched alongside its sibling, the Sony ULT Field 5 in April 2025. It has a list price of $199 / £179 / AU$329, but there’s good news – I’ve already seen it on sale for less through various online retailers. In the UK, for instance, Sony has already run a slashed-price offer, which allows you to pick the ULT Field 3 up for less than £160, so keep your eyes peeled for a bargain buy.

You can grab the ULT Field in three different colorways: Black; Forest Gray; and Off White. The variant you chose should have little to no impact on the price you pay for this model.

Sony ULT Field 3 review: specs

Sony ULT Field 3 review: features

• ULT mode for enhanced bass output
• Sound Field Optimization
• Great battery life

As is typically the case with Sony, you’re getting a solid suite of features on the ULT Field 3. You get the standard stuff like multi-point connectivity, fast-pairing and multi-speaker pairing – which unlocks stereo mode – but there’s so much more to uncover.

Perhaps the main attraction is the ULT mode, which gives bass a gigantic boost. It’s well worth having this on if you want the most powerful, party-ready sound available, but I’ll drill into that a little more later. You can also listen with ULT mode off or set your own custom EQ using a seven band equalizer.

Another audio-related feature that interested me was Sound Field Optimization. This essentially detects noise from your surroundings and fine-tunes audio output to be as clear as possible for your environment – something that’s particularly useful in busier outdoor areas.

But if you dive into the Sony Sound Connect app, there’s a little more at your fingertips. There’s STAMINA (yep, in all caps) mode, which provides a boost to battery life while restricting elements like different sound modes. There’s also an option to prioritize connection quality over sound quality or control playback from your music apps.

One more feature that you don’t always find is an integrated mic that enables hand-free calling. I tested this out and found that my voice came through clearly and my friend's speech on the other end of the line never had any noticeable tinniness or distortion.

Does the ULT Field 3 have the most fleshed out feature-set I’ve ever seen? Well, not quite. There’s a distinct lack of EQ presets, no LED lights or similar, no Auracast over Bluetooth LE audio and omission of wired listening.

Still, there’s plenty overall – even a USB-C charging port that can juice up external devices or serve as a medium to charge the speaker itself. While we’re here, let’s talk battery life too. I was impressed with the ULT Field 3’s playtime – in fact, it’s one of the best things about this speaker. You get up to 24 hours of battery life – of course, if you’re listening at high volumes with ULT mode on, that’s gonna be lower. But still, this speaker is more than capable of keeping the tunes bumping well into the early hours.

• Features score: 4/5

Sony ULT Field 3 review: sound quality

• Standard ULT-off tuning sounds poor
• But with it active, you get improved, bass-heavy audio
• No advanced codecs, not even LDAC

OK, to be frank, I was initially pretty disappointed with the audio performance of the Sony ULT Field 3. I started off by listening with ULT switched off and tuned into Black Eye by Allie X which sounded… underwhelming. The meaty drum machine lacked its bite, taking the rhythmic bounce of the track down a peg. At higher volumes, the vocals had a slightly tinny edge to them too. But much of this could be rectified.

Yes, I simply pressed the ULT button and things vastly improved. The deep bass of that drum machine reared its lovely head, finally giving the track some much needed uplift in the low end and, in turn, I was gifted a more full-sounding delivery. In addition, dance tracks like Last One Standing by Kolter and Sidney Charles sounded better this way, with strong low-end output and decently crisp vocal sections.

But even with ULT mode on, I did encounter some issues. All songs sounded noticeably compressed as I gradually pushed the volume higher and higher. By the time I’d reached 80-100%, there was little breathing room for each instrument, resulting in quite a muffled, narrow sound. Treble especially could get pretty harsh with loudness pushed to the max. At medium volume, I’d argue that vocals, percussion and strings were all relatively clear, and the audio can just about fill a medium-sized room. But don’t expect phenomenal separation or microscopic levels of detail even here.

On that note, you won’t get any ‘hi-res’ Bluetooth codecs with the Sony ULT Field 3. Even Sony’s proprietary LDAC has been left out. Then again, this is more of a fun and convenient party speaker rather than a device pitched at audiophiles. And there are a ton of great alternatives if you want a more revealing listen – just look at the Bose SoundLink Max (or newer, smaller, cheaper SoundLink Plus) for instance.

There are a couple of other issues I ran into that are worth noting. Even with ULT mode on, the speaker didn’t quite have the might to handle dark sub bass. For example, The Boys Are Back In Town by Yung Gravy – marked by imposing deep bass running throughout – wasn’t replicated all too well. The speaker just didn’t quite have that extension in the low-end to make every boom sound ultra-clear, with the deepest notes tailing off a bit, even in ULT mode. For a speaker of this size, that’s fairly common – but it’s worth considering if you want the ultimate bass-heavy audio companion.

Speaking of that, there’s a seven-band equalizer that you can access via the Sound Connect app, which does enable you to forge a better sound than the standard ULT off tuning. But that’s it. There aren’t any other presets, which is pretty disappointing if you just want a swift way to adjust the sound to you. There’s also no EQ test, as seen on Sony’s recent smash hit headphones, the Sony WH-1000XM6.

Still, with a custom calibration, I did find that tracks with more emphasis on vocals – rather than big booming bass – could sound fairly clear. Rains Again by Solji had solid balance across the frequencies, with expressive vocals and soft strings coming through with enhanced clarity. And for tracks like this, where ULT mode will afford too much emphasis to the low-end, that quality is most welcome. All in all, decent audio is achievable with the ULT Field 3, but it’s far from the best-sounding speaker I’ve tested.

• Sound quality score: 3/5

Sony ULT Field 3 review: design

• IP67 dust and waterproof rating
• Adjustable and detachable strap
• Looks-wise not my fave, but fairly compact and durable

The Sony ULT Field 3 is certainly designed to be a rugged, outdoorsy speaker and it serves that purpose nicely. That’s largely thanks to its up-to-scratch IP67 rating, which means it's both dustproof and able to survive 30 minutes of underwater submersion, up to one meter – something I’d expect from any of the best waterproof speakers.

On top of that, there’s a really solid feel to the Field 3. It has a robust, durable, and fairly chunky build – if you dropped it I think it might break the ground rather than the other way round. Weighing in at 2.6lbs / 1.2kg, it’s got some serious weight for its size. Overall, it really does feel as if the ruggedness of this speaker is its selling point, rather than sound quality.

No matter the environment, you’ll be able to take the Field 3 around with ease, thanks to a fabric strap that’s pre-attached to the speaker (it can be removed). Some models like the Tribit Stormbox Lava come with a handle that you can swap in for transportation over shorter distances – something I would’ve liked to have seen here – though you can adjust the strap to make it shorter for handheld use if you’d prefer.

In terms of looks, I wasn’t loving the Field 3, though that’s fully down to personal preference. I just didn’t quite dig its rounded brick-like aesthetic and the color options were a bit on the bland side for me, but you might love it. Beauty is in the eye of the beholder...

And there’s certainly stuff here that I do like, including simple yet effective button controls, a tab hiding the USB-C port, and a decently compact build. So yes, plenty to admire about the Field 3 as far as design goes – especially if you want something that’s ready to brave any setting, from living room through to the beach.

• Design score: 4/5

Sony ULT Field 3 review: value

• Audio not good enough for the price
• A lot of rivals can still offer the ruggedness too
• Ultimately overshadowed in a tough market

The Sony ULT Field 3 is by no means an inexpensive speaker. At $199 / £179 / AU$329, it’s not quite in the premium tier, and its sibling the ULT Field 5 will come at a substantially higher price. But there are tons of similarly sized rivals offering great sound, build quality and features at a similar – or even lower price.

Value for money is simply not the ULT Field 3’s strong-suit. That's mainly because audio quality is pretty disappointing. You can definitely achieve a decent listening experience with ULT on for bass-heavy tracks, or custom calibration for softer genres and podcasts, but still – there are some issues, like underwhelming sound with ULT off and prominent compression at high volumes that hold this model back.

When you have rivals like the JBL Charge 6 on the market that offer impressive audio, an even higher IP rating and the same battery life, there simply aren’t many reasons to recommend the Field 3.

Is this a bad speaker? No, no it’s not. The ULT mode is the key draw, offering solid bass response for a speaker of this stature. You also get a ton of playtime and great protection against the elements. But I’d argue that’s not enough given the competition from, of course JBL – but also the Sonos Roam 2 (below), Ultimate Ears Everboom, and Tribit Stormbox Lava.

• Value score: 2.5/5

Should I buy the Sony ULT Field 3?

Buy it if...

Don't buy it if...

Sony ULT Field 3 review: also consider

Sony ULT Field 3 review: how I tested

• Tested for one week
• Mainly used in our music testing facility at Future Labs
• Predominantly tested using Tidal

I put the Sony ULT Field 3 to the test for a one week period (after a thoroguh run-in of 15 hours), tinkering with all of its features, blasting hours worth of tunes and assessing all aspects of its design. I predominantly tested in our music testing room at Future Labs in order to judge audio quality in an isolated, controlled environment.

When listening to music, I mainly used Tidal, but I occasionally played songs via Spotify too. I initially streamed tracks from our carefully curated TechRadar reference playlist, but I also listened to music from my own personal library.

I’ve tested all sorts of audio gear during my time here at TechRadar, from flagship headphones like the Sony WH-1000XM6 through to home cinema products like the Marshall Heston 120. I’ve reviewed a large array of speakers along the way from brands like Sony, LG and JBL, so I have a strong understanding of the ULT Field 3’s rivals, as well as what it takes to stand out as a strong candidate in a highly competitive market.

• First reviewed: June 2025
• Read more about how we test