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Sony is reasserting itself in the market for portable party speakers, a sector long dominated by JBL while brands like Samsung, LG, and Hisense are making inroads. As a reminder, these speakers are designed to deliver loud sound, club lighting, and the ability to mix DJ effects or even connect microphones for karaoke sessions.
After the decent but unremarkable ULT Tower 9 and 10, Sony is shifting gears with the ULT Tower 5, Tower 7, and Tower Max. The ULT Tower 7 belongs to the same series as the 9 and 10, but upon closer inspection, perhaps not to the same family.
New design, new sound, I spent weeks listening to it every day, and there’s a lot to discuss.
Sony ULT Tower 7 Technical Specifications
| Model | Sony ULT Tower 7 |
|---|---|
| Dimensions | 42.1 cm x 34.7 cm x 71 cm |
| Battery Life | 30 h |
| Bluetooth Version | 5.3 |
| Weight | 22800 grams |
| Protection Rating | IPX4 |
| Product Sheet |
This review was conducted with a speaker loaned by Sony.
Sony ULT Tower 7 Design: A Vertical Speaker That Can Also Lay Horizontal
The Sony ULT Tower 7 is a hefty speaker weighing nearly 23 kg, a weight that matches its acoustic ambitions. Playing loudly with lots of bass frequencies requires powerful transducers, which by definition are equipped with large magnets. All this adds weight, which is a good sign.
However, unlike the ULT Tower 9 or 10, the ULT Tower 7 is designed to be carried by one person or two. It is equipped with four handles, one at each corner. Whether it’s set up vertically or horizontally, it’s just as easy to grasp. A pair of wheels is also present, with a fifth handle to move it like luggage. This handle is not telescopic, so you either need a long arm or to bend down to pull it.
The speaker is sturdy, with rounded corners and a front face covered by an acoustic grille, on which the ULT button is installed in the upper left corner. This button acts as a volume potentiometer and can be pressed to switch between different equalization modes.
Control Buttons Distributed Across Three Areas
Sony has made a clever choice with the placement of control buttons. They are not all located on the upper deck, and in practice, this is a good idea. As seen, the volume button is at the front and, on the top, are mainly essential functions like power and Bluetooth pairing. In the dark or the heat of the party, this prevents users from pressing where they shouldn’t and changing the audio input, for example.
The secondary buttons are located at the back of the speaker. Here you’ll find the Stereo Pair button to link two Tower 7s, the Stamina mode button to save battery by reducing bass and certain processes, and finally the Light button, which allows you to change the lighting.
Two Light Sources
Regarding lighting, Sony knows its stuff. The installation of LED paths was already a specialty of the manufacturer with its smaller Bluetooth portable speakers. Here, a luminous strip surrounds the facade and changes color depending on the settings or the music. The ULT button itself has its own luminous ring.
This system remains moderately powerful but sufficient to create a festive atmosphere.
Sony ULT Tower 7 Connectivity: Almost a Mini Sound System in Itself
Sony offers a much richer set of connections than a simple Bluetooth speaker, with two line inputs to connect an external source, a turntable, a CD player, or any compatible analog source. The first is in the classic RCA Cinch format, the second in the professional XLR standard, for connecting a mixer, for example, or using very long cables. There is even an XLR output to send the signal to another speaker.
For karaoke, Sony adds a microphone input in 6.35 mm jack with dedicated volume control. This input is also compatible with electric guitars.
The USB-A port is mainly used to play music from a removable drive. The USB-C, on the other hand, supports USB audio from a smartphone or computer while also allowing for charging a smartphone, for example.
The only downside is that the ULT Tower 7’s battery cannot be charged via USB-C.
Bluetooth connection is provided in version 5.3, supporting SBC, AAC, and LDAC codecs. Multi-point also allows two devices to be connected simultaneously.
Sony ULT Tower 7 Internal Architecture: Three Ways and Bass-Reflex
The Tower 7 adopts a three-way architecture, with a large 28 cm bass driver, two 12 cm midrange drivers, and four 5 cm tweeters, two of which are placed at the rear.
Unlike JBL, which consistently chooses to use two woofers for bass, Sony opts for a single much larger woofer. It’s a different philosophy: small woofers often produce a quicker bass, while a large woofer brings more impact, sometimes at the cost of a bit of lag. As we’ll see later, the bass produced by this 28 cm woofer is very authoritative and serves the festive purpose well.
The enclosure used is a classic bass-reflex, with a Sony DUCT port positioned downwards, in the base of the speaker. To recall, the bass-reflex involves using a resonating tube, which inflates a targeted range of very low frequencies. The benefits are multiple: more infra-bass, less membrane movement of the woofer, and less amplification power required on the frequency range where the tube operates.
Why Three Ways, and Not Two?
The Sony ULT Tower 7 adopts three ways, where most party speakers settle for two. In other words, bass sounds are produced by the 28 cm woofer, midrange sounds by the 12 cm drivers, and treble sounds by the four tweeters. This brings increased accuracy in sound reproduction, because unlike a two-way system where midrange sounds (the most essential for clarity) are shared between the woofer and the tweeters, they are here reproduced by a pair of optimized drivers. As we will see later, this is a major advantage of this speaker.
Rear Tweeters: A Very Good Idea
Sony didn’t just install four tweeters to inflate the specs sheet. Two are placed at the rear, and this is particularly relevant with this type of speaker, around which listeners move.
Without rear speakers, you quickly find yourself mainly hearing the bass when you move behind the speaker. High frequencies become much less present.
Here, good sound reproduction is maintained at the rear. Obviously, the best result is still obtained in front of the speaker. But there is much less of that muffled sound feeling as you move around.
Sony calls this 360° Party Sound. In practice, the diffusion is closer to 180°, but it fulfills its role well around the speaker.
Sony ULT Tower 7 Sony Sound Connect: The Dashboard
Sony Sound Connect provides access to sound modes, a 10-band equalizer, lighting functions, and several additional settings. Sony notably allows you to associate equalization settings with ULT1, ULT2, or FLAT modes.
For example, you can keep the deep bass of ULT1 mode while tweaking some frequency zones to adapt the speaker to your living room or your tastes.
Sony indicates that the speaker automatically adjusts its behavior depending on its environment. As often with such claims, this is not well explained, and one assumes that the speaker has a microphone to determine ambient noise and make minor improvements (more treble, for example). In use, I didn’t notice anything really differentiating.
The app also allows you to manage the lighting. Three modes are offered, with several customization possibilities.
Two Tower 7s can be paired for stereo listening via Bluetooth Stereo Pair. For much larger setups, Sony offers Party Chain via Auracast, with up to 100 compatible speakers.
Sony ULT Tower 7 Audio: A Well-Thought-Out Response Curve
From a party speaker, you expect it to play loud, very loud, with lots of low frequencies. The ULT Tower 7 accomplishes this, I measured 109 dB at 1 m in the midrange and even 108 dB in the low frequencies. This is huge and better than its direct competitor, the JBL PartyBox 520.
More interestingly, this power is very well controlled, and the sound quality is quite exceptional for a speaker of this type. The level of detail (thanks to the three-way system) is impressive, whether at moderate or high volume. The ULT Tower 7 is a speaker that can be comfortably listened to as background music, and that’s precisely what I did for weeks as it impressed me so much.
Surprisingly, it highlights unusual details, emphasizes a bass line or electric guitar, better embodies a voice. The space between the sound planes is rare in a party speaker.
However, these excellent performances are achieved using the Bluetooth LDAC connection. With an iPhone (AAC codec), the sound remains excellent, but it lacks that little something that gives real listening pleasure. It seems that Sony has optimized LDAC audio stream handling in the speaker.
Response Curve
I measured the ULT Tower 7 at moderate volume and then at full power. First observation, the bass does not collapse as the volume increases. This is quite rare and worth noting. In other words, the same tonal balance is obtained regardless of the volume.
The bass-reflex load appears to be optimized to hit around 60 Hz, with a massive peak in this area, which results in a bass that hits more than it rumbles, although there is still a satisfactory sense of depth. It would have been nice if the Tower 7 teased 40 Hz with more juice, to shake the walls, but for that, you’d need to look at the Tower 9.
Clearly, Sony is not trying to go as low as possible at any cost, which is not a bad thing considering that outdoors, very low frequencies often get lost in nature.
The rest of the curve, from midrange to high frequencies, is very regular, with slight peaks to reinforce voices and instrument fundamentals, and a slight brightness in the highs. Just what it takes for everything to breathe.
True Musical Versatility
According to Sony, the cumulative amplification power reaches 420 W, which is surprisingly not so high given the volume produced. The drivers used must have a very high sensitivity to require only 420 W and play so loud. All the better. The dynamic range is remarkably well marked, both small and large. This is what allows the speaker to deliver such an organic sound.
Thus, you can listen to anything with the Tower 7, from pop to rap, rock, and even jazz.
Sony ULT Tower 7 Battery Life: The 30 Hours Come with a Caveat
The Tower 7’s battery is integrated into the speaker. It is therefore not removable like a spare battery that you could simply take out and replace in a few seconds. This is a point to keep in mind for intensive outdoor use.
Sony claims up to 30 hours of battery life for the Tower 7, but this figure corresponds to specific conditions: ULT1/ULT2 modes activated, volume set to level 17 (one third of the volume), and lighting turned off. Under these conditions, the 30 hours are even exceeded.
However, at full power and with lights on, the battery life drops significantly, which is quite normal. Sony is transparent about this and claims about 3 hours.
To party all night away from a power outlet, you will need to equip yourself with a charging station (DJI, Bluetti, Ecoflow).
Full charging takes about 3 hours and more when the speaker is playing music.
Sony ULT Tower 7 Price and Competition
The Sony ULT Tower 7 speaker is launched at a price of 799 euros and is currently offered at 599 euros.
At this price, it competes with the JBL PartyBox 330, also recently launched. The JBL uses smaller drivers but is capable of going lower in the bass, albeit with a lower maximum volume.
On paper, its main competitor is the JBL PartyBox 520, currently priced at 699 euros. On the field, the two play in a comparable power category, but the Sony can play louder while maintaining its balance.
Marshall offers the Bromley 450 (649 euros), which has the advantage of emitting sound equally from the front and back and includes a removable battery announced for 40 hours, but plays less loudly and cannot hold up in the bass compared to the ULT Tower 7.
Currently, the Sony ULT Tower 7 is clearly the best choice in its price range.
Sony ULT Tower 7
at the best price
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Maya Singh is a senior editor covering tablets and hybrid devices. Her work explores how these tools reshape digital productivity and learning. She also contributes to feature editorials on emerging tech.
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