YU4 Powered Speakers From Kanto

26th June 2019

These powered, stand-mount examples also feature a built-in phono amp. Paul Rigby reviews.

They’re very useful things. There’s no doubt about it. The basic notion is crazy and would appear to be the worst design decision you could ever consider but still, on a practical level, power speakers do a job.

Why crazy? Actually wishing to cram one hi-fi component into the same chassis as another is asking for trouble in the form of veiling noise, the like of which will creep from one component to another. Then there’s excess vibration that is a noted result of using a speaker in the first place. This stuff affects the performance of everything else in the same chassis. Daft, that’s what it is.

As I say though, the powered speaker is a great idea if… 

If you’re short of cash then any bundled hi-fi component is (generally speaking) going to save you money when compared to buying the same standard of components within their own chassis containers. If you are short of space then stuffing a powered speaker full of hi-fi components is going to dramatically decrease the footprint of the final hi-fi system. Ideal for students, second systems for a bedroom or similar, those living in rather cramped conditions and so on. If you can’t be bothered with buying and fitting cables or are nervous about the same or you hate the messy look of cables per se, then the powered speaker will both save you a job and will look neat and tidy, on a relative level.

More than that, impossibly good designs from some companies out there has actually resulted in a range of pretty decent powered speaker performers, on a sonic level. So how do the YU4 designs fare?

This pair of YU4 speakers features, on the front, a 25mm silk dome tweeter and a 102mm mid-bass unit created featuring Kevlar, included for “strength and rigidity” reasons.

YU4 Powered Speakers From Kanto

Spanning 4 x 19 x 22cm, the speaker is small but no smaller than many other designs in its class while each speaker weighs in at 3.2kg. Inside is a 70W Class D amplifier. There’s a source/volume/stand-by selector knob on the front too that can be rotated and pushed in for source selection. You’ll also see a black circled sensor which shines with an appropriately coloured light relating to any particular condition: white is ‘power on’, yellow is ‘stand-by’ (the speakers power down after 15 minutes of inactivity) and blue relates, appropriately enough, to Bluetooth. Pushing the knob inwards cycles through the input sources one at a time: RCA, Aux, Opt1, Opt2 and then Bluetooth.

YU4 Powered Speakers From Kanto

The remote provides access to tone controls and also CD-type play controls for the attached Bluetooth device.

On the rear, apart from the binding posts, are the following inputs: 3.5mm mini-jack, RCA with phono switch, a pair of optical TOSLINK sockets (why no Coax?) and Bluetooth 4.0 with aptX. There’s an IEC power socket and I would recommend upgrading the included kettle lead as soon as you can. Outputs include Subwoofer and a USB Charge 5V 1A connector. In the box you also receive little stick-on rubber feet, a connecting wire to run from the master to the slave speaker and a 3.5mm auxiliary cable.

YU4 Powered Speakers From Kanto

If you want to use the speakers as near-field devices, Kanto does supply stands that angle the speakers upwards to 16 degrees. I wasn’t supplied with these so I’m afraid I could not test them. 

YU4 Powered Speakers From Kanto

It’s a shame there’s no USB input to take a USB stick music source. Instead, the USB charging port – included to charge your phone, for example – betrays the lifestyle market that the YU4 wishes to occupy. It’s this one feature that stands out like a sore thumb. That is, the YU4 was built under a restricted build budget and instead of including a standard USB input or improving the sonic quality of another component, Kanto decided to include a USB charge port instead. 

Before we begin the sound tests, I must also report that I ran all of the tests with the tone controls disabled. Engaging them results in all frequencies sounding somehow false and plastic. 


I began by hooking up my Astell&Kern AK120 to an optical port of the YU4 and played Andrew Gold’s Spence Manor Suite album track, Can’t Help Forgiving You, ripped from a CD at 16bit/44.1kHz.

My first tests were undertaken using the YU4 speakers as standard hi-fi speakers. As opposed to near-field speakers. That test would follow later on.

YU4 Powered Speakers From Kanto

My first impression of the YU4 speakers was that they tended to live life in the midrange. Bass was there to a degree but that mainly consisted of upper bass frequencies. I wouldn’t blame a small chassis for this either, I’ve heard other speakers of a similar size that provide more lower bass response. For the YU4, tonal balance…isn’t really. The majority of the frequencies are pushed upwards towards that midrange position. That said, there’s no obvious overarching, consistent nasties here in terms of edgy upper mids or treble. In fact, both of these areas offered plenty of detail and were fairly balanced. I say ‘fairly’ because there were one or two moments on this track which did produce a slightly strident response around the upper mids.

This song has a steady, trudging along a country path kinda beat. There’s one point where the strumming guitar, drums and tambourine coincide. So what you get is strum-strum-bam! Where the guitar strums twice and the drum joins in on the final strum to add a bass-beat. On that ‘bam!’ beat, the tambourine is also struck. So, if you were in the studio watching the artists you’d hear that final beat being negotiated by the guitar, drums and tambourine, all at once. The final combination of guitar/drums/tambourine produces quite an intense noise that, no doubt, had the VU meters flickering upwards in the studio. It’s at this point that the YU4 speakers found it hard to cope and the sound was almost metallic. Just for a moment. Then it was gone and everything returned to normal. That said, because the tonal balance was pushed upwards, the effect on the ears was notable. 

Listening to a slice of Trigram by Heo Dae-uk at 24bit/96kHz I noticed that this dramatic piano piece depended on reverb tails and space to make its point, just as much as the actual free-form classical delivery. Again the midrange emphasis lost some of the resonant grandeur of the piano chassis, that booming vibration from bass notes was absent, while upper mids offered a touch of emphasis. 

There was still much to like, though. Because the sonic frequencies were levered up a tad, the detail was plentiful, fast, agile and certainly dextrous. The music from the YU4s could resemble a hummingbird in action. Such was the almost athletic nature of their performance. 

Upper midrange resonance was focused with superb transient detail. Notes started and stopped with great precision. Bass was also present to some extent, of course, although it was upper bass that I was hearing. That too was nippy and full of energy, giving the music momentum and a sense of vitality. 

It was at this point that I decided to wind in the YU4 speakers (at least in terms of distance) and listen to them in a near-field environment. Desk-top speakers, speakers for a bedroom, speakers for use either side of a computer: that kind of thing.

And that’s where these speakers came to life. As near-field speakers their performance improved dramatically. Bring them near to you, lower the volume, position them to create a nice stereo image and they sound lovely. OK, bass was still rather shy and it would have been nice to have had more dynamic range to add flavour but, in the near-field configuration, bass was enhanced enough so that the overall tonality was much improved with the bass guitar being much more involved than before and drum strikes formed a useful grammar throughout the song. 

What really hit me at this point though was the superb soundstage arrangement. It offered a real 3D effect that didn’t depend on having the tweeter at ear height to work, ideal for any near-field speaker. Hence, for a desk set-up, the YU4s were still able to create a 3D, layered and informative soundstage. If you are able to lift the speaker’s tweeters to ear height then the detail will be further enhanced sure but the positioning remained flexible. A good thing.

Testing the Bluetooth option via my iPhone 8 and playing Marvin Gaye’s Mercy Mercy Me, I was pleased to hear a general level-headed performance without the typical Bluetooth edge and clinical response. This lossy file did experience a typical reduction of definition and dynamic reach but it remained listenable with enough detail on offer to serve well as background music while you’re doing other things. 

Finally, I plugged in a Rega RP1 into the rear of the YU4’s built-in phono amplifier and played Nancy Sinatra’s It’s Such a Pretty World Today from Country, My Way (Reprise).

Vinyl play was good. Although not particular exciting with a rolled off upper midrange and veiled bass response. Yet there was still lots of admire. For example, all frequencies were disciplined and in order with no treble pinching, midrange barking or bass blooming. There was a slight spotlight on the midrange but nothing to cause real offence. Having a phono amplifier in the active speakers won’t aid audiophile listening but it’s a quick and compact method of listening to vinyl, especially on a desk environment.


For general, stand-mounted hi-fi use, hanging off the end of a hi-fi system, the YU4s are usable but some may find that the design offers too many sonic compromises. They do struggle a tad in that configuration. Instead, see the YU4 design for near-field use only. When used in this way, the YU4 speakers perform very well indeed providing a complex soundstage and enough detail to engage and delight the ear. 


Price: £290

Website: kantoaudio.com


UK – https://amzn.to/327jmdw

USA – https://amzn.to/3kWPW9u

EUROPE – https://amzn.to/37YRuvU

GOOD: near-field performance, soundstage, finish, feature set

BAD: listening room performance, bass


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Rega RP1 Turntable

Trichord Dino phono amplifier

Rega Brio-R amplifier

Spendor S3/5R2 speakers

Tellurium Q cabling

QED Reference Quartz optical cable

Blue Horizon Professional Rack System

Harmonic Resolution Systems Noise Reduction Components

All vinyl was cleaned using an Audio Desk’s Ultrasonic Pro Vinyl Cleaner