Sony ULT Field 7 review: a great wireless party speaker that can handle its big bass

Sony ULT Field 7: Two minute review

The Sony ULT Field 7 is the company’s latest addition to the world of weatherproof portable speakers – gone are the days when listening to music outside meant trailing an extension cord precariously through the house and watching the skies with trepidation. The ULT Field 7 is a seriously large, seriously powerful party speaker, ready for big spaces.

Priced at $499 / £399, the Sony ULT Field 7 is available for purchase in the US and the UK and will be available in Australia at some point, but Sony hasn’t shared the price or release date there just yet. However you look at it, this is a big outlay if you’re only looking for an occasional party speaker, but if you like to entertain a lot, or are generally just a fan of heavy bass and want one of the best Bluetooth speakers that can deliver this, the price may not be so off-putting to you.

In a bid to make the Sony ULT Field 7 the perfect party companion, it’s been designed to be waterproof and dustproof, with an IP67 rating backing this up, which is about as good as you get from the best waterproof speakers. This means that you’re all good to use this speaker whether you’re entertaining during a rainy BBQ, or having a beach party. While Sony has attempted to jazz things up with colorful lighting, it is a shared opinion in the TechRadar office that this speaker does, unfortunately, look a bit like a trash can when standing vertically. 

While you may be correct in thinking that a super-charged party speaker like the Sony ULT Field 7 isn’t going to provide the most delicate of listening experiences, it’s surprisingly well-rounded. Not only do bass-heavy tracks sound exciting and dynamic, but mids and trebles are handled well across all genres. Podcasts and talk shows are even pleasant to listen to, and speech is clear.

One aspect that let the ULT Field 7 down is the Sony Music Center app. Its design is reminiscent of a pre-2010 website, it’s laggy, and has some connection issues. At least with the ULT bass and lighting modes easily adjustable on the speaker, you should only need to use the app every now and then, unless you spend a lot of time fiddling with the finer details (which I did, but such is the life of a reviewer).

The size and weight of the ULT Field 7 is something worth considering carefully. The speaker is marketed as being easy to carry – which is somewhat true thanks to the solid integrated carry handles – but, at a size of about 20 x 9 x 9 inches / 512 x 224 x 222 mm, and weight of about 14lb / 6.3kg, you aren’t going to want to carry it long distances.

So, should you spend $499 / £399 on this speaker? If you don’t mind the aesthetics and the disappointing app, the quality of the sound is impressive, and could be exactly what your next party or gathering needs.

Sony ULT Field 7 review: Price and release date

• Released April 2024
• Priced at $499 / £399 (about AU$770)
• 'Coming soon' to Australia

The Sony ULT Field 7 launched in April 2024 as part of the new ULT-series lineup. The lineup also included four other models, the ULT Wear headphones, the ULT Field 1, and the ULT Tower 10.

The ULT Field 7 costs $499 / £399. This translates to about AU$770, but it's listed as unavailable on Sony’s Australian website at the time of writing. It does state “available soon”, so hopefully the official pricing will be added shortly.

This is fairly high in the world of portable speakers, but is far from unusual – the JBL Xtreme 4 and UE Hyperboom come in at a similar kind of price, though both are a little cheaper.

Sony ULT Field 7 review: Specs

Sony ULT Field 7 review: Features

• ULT presets for powerful and deep bass
• Waterproof and dustproof
• 30 hours stated battery life

The Sony ULT Field 7 has a load of features that help to make it a good choice for parties or outdoor gatherings. Firstly, and most importantly for this speaker to be worth its salt, is the powerful ULT sound. There are two preset bass EQ settings, ULT1 and ULT2. The ULT1 setting is intended for tracks with especially low-frequency sounds, delivering impressively deep levels of bass. ULT2 is for delivering louder and punchier bass, better suited to house parties where the lack of detail won’t matter, as you’ll be focussing more on dance-offs. 

The ULT Field 7 also has a Sound Field Optimization feature, which is designed to detect the sounds in the surrounding environment before automatically adjusting the audio settings to improve how it sounds in reaction to them. 

The ULT Field 7 promises to provide 30 hours of playtime, and can build up three hours worth of playtime after charging for 10 minutes. This stated 30 hours battery life is based on having ULT 1 or 2 on, and the lighting (which is just in the ends of the speaker) off. 

I found that the battery dropped 20% over about five and a half house with the lighting and Sound Field Optimization on. This suggests that this speaker could run for about 27 hours with these features enabled, which is good going considering Sony says that’s basically the worst-case scenario.

The design of the ULT Field 7 is a feature in itself. It has integrated carry handles that make it easy to maneuver, plus it has an IP67 waterproof and dustproof rating and is salt water resistant, so you can feel confident in the speaker's durability whether you’re having a party at home, in the garden, or on the beach. 

To further add to the party vibe, hidden behind the rear panel is an input for a microphone or guitar so you can use the ULT Field 7 as a karaoke machine, or a guitar amp, which is a nice bit of versatility. 

Speaking of amping up the sound, the Party Connect feature means that you can link this speaker to a wide range of other compatible speakers in the Sony range, so you can sync up the sound and lighting.

In other wireless tricks, it has LDAC higher-quality Bluetooth support, plus multi-point pairing so you switch between devices it's connected to easily.

• Features score: 4.5/5

Sony ULT Field 7 review: Sound quality

• Impressively deep bass
• Satisfying vocal clarity
• Don’t expect a lot of detail

Despite this speaker focusing its efforts on heavy bass levels, it still delivers a balanced and pleasant listening experience across the board, as you’d expect from Sony. Yes, some delicate details are overshadowed by the amplified basslines, but anything aimed at parties was never going to be the audiophile's ideal choice.

By default, the speaker is set to the ULT2 mode. There is a noticeable difference when switching to ULT1 because, as promised, this setting does indeed deliver more depth. I am impressed with the way it handles low frequencies, giving much-needed definition to the low-end of tracks like Angel by Massive Attack, which is lost amid the amped-up bass of ULT2 mode. 

A good level of softness and detail are still detectable in vocals in ULT1 mode – and even in the punchier ULT2 mode, voices still sound clear. It doesn’t sound like you’re listening from outside the venue, which can be the case with cheaper and smaller speakers when you crank up the bass power. 

ULT2 mode succeeds in still delivering dynamic sound that makes you want to bounce along to the beat while being more refined. The bass isn’t overpowering when listening to Von Dutch by Charli XCX; the balance is there between the clear vocals and the energetic bassline.

The important thing with outdoor speakers is that they are able to carry big bass and clear vocals across the open air, battling breezes and other interferences, across a potentially long distance. The ULT Field 7 has no trouble with this – and unlike some, it actually sounds good while doing it. 

Listening to podcasts is a surprisingly detailed experience too. When listening to The Unbelievable Truth there was a good balance between the speech, buzzer sounds, and audience laughter and applause. 

This speaker delivers a satisfying well-rounded listening experience with a light touch when needed, which is particularly impressive considering it’s a beast of a speaker (in a good way) when it comes to its thumping bass registers.

• Sound quality score: 4/5

Sony ULT Field 7 review: Design

• Ashtray vibes
• Collects dust and debris easily
• Robust and durable

I’m sorry to say that I’m a little less positive when it comes to the looks of the Sony ULT Field 7. It has been designed to sit horizontally on a surface or to stand vertically on one end. I don’t have particularly strong feelings when it is sitting horizontally. The control panel is easy to access, and the ULT Field 7 looks like what it is: a big speaker. But when it’s standing on one end, I can’t lie, it’s giving me the feeling of a public ashtray outside a hotel or conference venue.

On a brighter note, the button controls feel substantial and are easy to press. Sony has a habit of using a satisfyingly soft silicone material, and this is what’s used here too. The control panel houses the power, Bluetooth, play/pause, volume, and ULT mode buttons printed in pale grey. When the illumination is on, the ULT button lights up in sync with the circular ring lights that sit on either end of the speaker. These lights are more subtle than seems ideal, because they’re set quite far into the sides of the speaker – I feel like if you’re going to do this in a big speaker, you should really go for it, otherwise why bother with the battery drain? – but they make a nice touch. There are nine different lighting effects available, as well as the option to turn the lights off.

There is a hatch on the back of the speaker that conceals a number of additional controls, including a light button, which cycles through the illumination effects, a battery care button to protect against over-charging, an echo button, and key control buttons. This is also where the inputs live for a microphone or guitar, USB-A, aux-in, and the plug for charging (a figure-eight cable – no USB-C here).

Sony markets the ULT Field 7 as easy to transport, designed with convenient carry handles built into either end. While these handles do make picking it up a lot easier, it doesn’t change the fact that this speaker is on the large side, measuring about 20 x 9 x 9 inches / 512 x 224 x 222 mm and weighing about 14 lbs / 6.3kg. I’m quite a petite person, and while I can carry the speaker between rooms, it would be a struggle for me to wander down to the beach with it.

While the speaker itself has a good dustproof rating, the outer fabric and silicone ends and feet pick up dust and debris easily. So it'll definitely work happily wherever you take it (within reason), but you will probably find that it starts to look less-than-pristine quite quickly, and fabrics like this aren’t super easy to clean.

Now, I know I bashed the appearance earlier, and I still stand by my opinion that it looks like somebody attempted to jazz up an office trash can with some RGB lights – but ultimately, this speaker is designed to be durable, so it makes sense that it looks somewhat utilitarian.

So while I’m not happy about how quickly it starts to look dirty, the intention is to have the ability to listen to music in wet, dusty, or sandy environments, without worrying about it taking its toll on the hardware. At least the rating means that it’s somewhat washable, so all is not lost even if it gets a little grubby.

• Design score: 3.5/5

Sony ULT Field 7 review: Usability and setup

• Quick setup
• Disappointing app

Setting up the Sony ULT Field 7 was simple. The speaker powered on easily, and I just had to press the Bluetooth button and my iPhone spotted it straight away.

The appearance of the Sony Music Center app feels low-budget, which is disappointing for an established brand like Sony. My less-than-positive opinions were further proven when switching between apps, as each time I left the app it appeared to disconnect from the speaker, so it takes a moment to reconnect each time I move away from the app. I found this particularly frustrating when fine-tuning the settings, as every time I hopped onto the Apple Music app to change tracks and get a feel for the changes I’d made, I had to start from the home menu again when I returned to the Sony app. 

In addition to the delay from switching between apps, it took over a minute – sometimes longer – for the app to connect with the speaker after powering it on, whereas other Bluetooth speakers I’ve tested will reconnect to an app in seconds. Perhaps this will be improved by software updates in the future, but just note that it might be frustrating if you try it soon.

When tapping on My Library, the app is able to access Apple Music and my media library, so I can get straight to my chosen media through the app, if I choose to. (Obviously, like 99% of people, I mostly choose to just use whatever app I usually use.)

Tapping on Music took me straight to the Apple Music section within the app. There is a tab for audio input, for those times that you might want to use it as an amp for playing guitar, or to blare out some karaoke. There’s also a tab for USB input, so you can play music from a storage device. There’s a dedicated tab to take you straight to Spotify, if that’s your service of choice. 

Alongside the ULT1 and ULT2 modes, you can also alter the EQ settings manually in the Settings tab. Frustratingly, you need to head back to the Sound Effect tab to select Custom mode before the app will let you alter the EQ. Generally, other apps will intuitively switch off other modes when you customize settings, but this is just another example of the Sony Music Center app being disappointingly clunky.

• Usability and setup score: 3.5/5 

Sony ULT Field 7 review: Value

• Good audio quality for the price
• Great for parties (if not audiophile listening sessions)
• Over-priced for an occasional speaker

This speaker may not equate to being good value for the money if you only throw a party every once in a blue moon, but if you enjoy blasting tunes outdoors on the regular, then you’ll be getting what you pay for here, thanks to the durability and sound quality. I think it’s a sound investment for the right person.

That feeling of value is partly helped by the good range of features offered here, from two bass-boosting modes, to the sound adaptation based on audio around it, to karaoke and guitar plugs, to multi-point pairing.

I think the overall versatility is harmed slightly by it being as large and heavy as it is, which may bring down the value for some – its value as a beach speaker is reduced if you don't want to carry it to the beach because it's large and heavy – but that's balanced by it being well-built and having a good IP waterproofing rating.

• Value score: 4/5 

Should I buy the Sony ULT Field 7?

Buy it if...

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Sony ULT Field 7 review: Also consider

Brane Audio Brane X
The Brane X is only available in the US at present, but this speaker punches out jaw-dropping bass that’s capable of shaking the walls. Whilst this comes at a higher cost, if you want incredible bass in a smaller package, this speaker won’t let you down. Read our glowing review of Brane Audio’s Brane X to learn more.

Ultimate Ears Hyperboom
A long-running party speaker of choice for us, with powerful sound, at a similar (but slightly lower) price to the Sony. It has a lower IPX4 durability rating, and the battery life is lower at 24 hours – but you may prefer the blockier design. Read our full UE Hyperboom review.

How I tested the Sony ULT Field 7

• I tested the speaker for one week
• I played music continuously to determine battery usage
• I listened to music and podcasts

I tested the Sony ULT Field 7 over the course of a week – after a thorough run-in. I listened to a range of different music genres, and podcasts, listening out for how the speaker handled bass, mid-tones, treble, and so on. 

I mostly used the speaker in TechRadar's music testing room, where I could really get a feel for what it's capable of – but obviously I used this portable speaker in other locations as well.

To determine how fast the battery would run down, I played music continuously at 25% volume, and continuously checked to see how quickly the battery indicator changed, tracking the time along the way.

I played music to it from an iPhone, a MacBook Air, and a Fiio M11S music player with LDAC support. My main music sources were Apple Music and Tidal, but I also used Spotify and podcasts.

• First reviewed: May 2024
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