Audio Pro Addon C10 MkII: Two -minute review

Update September 19, 2025: WiiM and Audio Pro have contacted TechRadar to clarify that contrary to the initial September 4 announcement about a big Audio Pro WiiM-powered wireless speaker rollout, Audio Pro's new range of speakers aside from the C10 you're reading about here and the new A10 should no longer be described as "powered by WiiM" and instead "powered by LinkPlay", which is the parent company of WiiM. Audio Pro's new speaker range does not integrate with the WiiM ecosystem, and does not have direct WiiM support.

The release states: "For further clarity, the only Audio Pro speakers that are powered by WiiM and integrated with the WiiM Home app are the A10 and C10, WiiM Edition speakers, available exclusively via WiiM’s Amazon storefront."

To explore how WiiM compares to Sonos as a multi-room option, read this guide to the current state of both platforms. The rest of this review remains as written.

The Audio Pro Addon C10 MkII is a predictably good-looking wireless speaker with plenty going for it purely in design terms (as long as you're OK with monochrome). It’s lost its handle and its Amazon Alexa voice control compared with the original model, but it’s gained a swanky new streaming platform (thanks, WiiM!) which offers an absolute stack of options where music sources and system flexibility are concerned.

Best of all, it’s a fine-sounding speaker that is able to extract an absolute stack of information from a recording and put it into convincing context. It’s punchy when it needs to be, it’s insightful, and it sounds a heck of a lot bigger than it looks. Deft control of the low frequencies, plenty of midrange articulacy and a winning way with dynamic variations all add to its sonic charm. If it was just a little more vibrant and exciting when the music demanded it, the Audio Pro Addon C10 MkII would be absolutely ideal, but it is nevertheless worthy of a place among the best wireless speakers out there.

Audio Pro Addon C10 MkII review: Price and release date

• Cost $360 / £259 / AU$699 (approx.)
• Launched in 2021

When the Audio Pro Addon C10 MkII first launched back in 2021, it cost $450 / £329 / AU$749 (approx.).

Fast-forward to today, and not only has this product become even more compelling thanks to upgrades in its streaming support and smart features, but it’s also routinely available for $360 / £259 / AU$699 (approx.). It looks like rather than becoming outdated, the C10 MkII has matured and evolved…

Audio Pro Addon C10 MkII review: Features

• 80 watts of power
• Dual-band Wi-Fi and Bluetooth 4.2
• Numerous streaming options

It’s fair to say that Bluetooth 4.2 with SBC and AAC codec compatibility is not the most inspiring specification for a wireless speaker in 2025. But what the Audio Pro Addon C10 MkII lacks in cutting-edge Bluetooth chops, it more than makes up for in its wireless network abilities.

The exemplary control app, which is now bolted to WiiM’s extremely well-regarded streaming platform, allows you to integrate a lot of music streaming services – and I mean a lot: Amazon and Apple Music, Deezer and Spotify, Qobuz and Tidal, QQ Music, iHeart Radio and vTuner, and plenty more besides. The C10 MkII is compatible with Apple AirPlay 2 and Google Chromecast, and the app allows the speaker to be half of a stereo pair or part of a multi-room system without any fuss whatsoever. It’s an extremely flexible device.

Once aboard, digital audio information is processed by a 24bit/96kHz DAC and then is breathed on by 80 watts of Class D amplification. A pair of 19mm tweeters get 20 watts of power each, and in between them there’s a 133mm midrange driver that receives the other 40 watts. This bigger driver is supported by a rear-facing vertical bass reflex port.

• Features score: 4.5 / 5

Audio Pro Addon C10 MkII review: Sound quality

• Open, detailed and well-controlled sound
• Great tonal balance and frequency response
• Could sound a little more exciting

Yes, by the standards for $350-ish wireless speakers the Audio Pro Addon C10 MkII is quite large. But be assured the sound it creates is plenty larger than the cabinet it’s coming from.

The sort of scale the Audio Pro can invest in a FLAC file of Hookworms’ Negative Space is straightforwardly impressive. It can open the recording out and offer a proper sense of space at the same time, even though the point-source of sound is always obvious. The amount of dynamic headroom that’s available allows the speaker to track the ever-increasing intensity of the recording convincingly, and the control of the lowest frequencies is such that rhythmic expression is confident and naturalistic, too.

And as well as being controlled with real authority, the bottom end – like the rest of the frequency range – is loaded with detail and variation. The C10 MkII is no thumper – it hits good and hard at the low end, but is textured and tonally varied. The same is true at the opposite end, where treble sounds are bright and substantial, with plenty of information available regarding tone, attack and decay. Through the midrange, the Audio Pro is about as explicit and as eloquent as any device of its type and price I’ve heard. It communicates in absolute torrents.

The tonal balance is nicely judged – it’s not absolutely neutral, but the tiny suggestion of warmth (especially towards the bottom end) is almost certainly sensible in the context of the circumstances the C10 MkII will probably be used in. The evenness of the frequency response is splendid, too, giving measured and appropriate weighting to every part of the tonal range, without underplaying or overstating any particular area.

Really, about the only area of mild concern where the sound of this speaker is concerned has little to do with the specifics of performance – it’s more about attitude. For all of its undoubted dynamic potency and ability to paint a full and nicely detailed picture, the Audio Pro is not the most demonstrative listen.

It sounds quite like it looks: sophisticated, understated and in unarguable good taste. This, where audio quality is concerned, can be considered shorthand for ‘slight lack of excitement’. No one is interested in a feral loudspeaker, of course, but at those moments when a recording demands vigor and attack, I get the strong impression the C10 MkII thinks this kind of behavior is a little beneath it.

• Sound quality score: 4.5 / 5

Audio Pro Addon C10 MkII review: Design

• 165 x 320 x 185mm (HxWxD)
• Black, white or gray matte finishes
• Magnetically attached grille

The Audio Pro Addon C10 MkII is, by the standards of a ‘rectangular box’ wireless speaker, very nicely finished and actually quite elegant in an understated sort of way.

This is just as well – given the 165 x 320 x 185mm (HxWxD) dimensions, it could have very easily ended up looking a bit bulky. As it is, though, the standard of construction and finish, along with the unapologetically monotone options of black, gray or white matte colours, make for a very harmonious look. The magnetically attached grille helps with the clean look, too.

It’s a fairly sizeable proposition on the average desk, though, and the lack of a handle makes transporting its 4.3kg weight rather less easy than it might be. I can’t deny I’ve used the bass reflex port as a handle, but I can’t imagine Audio Pro would recommend it as an option…

• Design score: 5 / 5

Audio Pro Addon C10 MkII review: Usability and setup

• Great control app, extensive physical controls
• No voice control
• Can easily be part of a multi-room set-up

Unlike the previous generation of C10, there’s no Amazon Alexa voice control here – there’s no voice control at all, in fact. You may count this as a negative, you may not, but there’s no denying that your other control options are very nicely realized indeed.

That WiiM-powered control app, as already mentioned, is stable, logical and slick in operation. As well as the ability to integrate a generous number of music streaming services and internet radio providers, it’s also where you can form a stereo pair or establish a multi-room system. There’s bass and treble adjustment, the ability to establish as many as half a dozen presets, input selection, the ability to check for firmware updates and various timer and alarm-clock functions.

The top surface of the cabinet features a selection of controls, too, embedded in a tactile steel plate. Power, volume, playback control and Bluetooth pairing are all available here, and access to the six presets you’ve defined in the control app are also available. There’s also a little LED giving confirmation of the selected input.

• Usability and setup score: 4.5 / 5

Audio Pro Addon C10 MkII review: Value

• Excellent standard of finish
• Versatile streaming platform and app
• Extras add up to value for money

Consider the standard of build and finish, and then consider the out-and-out sound quality. Take into account the great new WiiM-powered streaming platform and all its possibilities, from forming a true stereo pair to easily creating a multi-room system.

And then look around at what this kind of money can buy you from alternative brands. Yes, the Audio Pro Addon C10 MkII is very good value for money indeed.

• Value score: 4.5 / 5

Should you buy the Audio Pro Addon C10 MkII?

Buy it if...

Don't buy it if...

Audio Pro Addon C10 MkII: Also consider

How I tested the Audio Pro Addon C10 MkII

Because the C10 MkII is mains-powered rather than battery-powered, I listened to it exclusively in my home. It’s a bit big for a desktop speaker, but nevertheless I gave it a go – it was much more at home on a shelf in the lounge, though.

I listened to music from Tidal and Qobuz via the excellent control app, of many types and quite a few different file sizes. And I listened both critically and with the Audio Pro functioning simply as a ‘background’ device – and there were never less than thoroughly enjoyable.

• First reviewed: July 2025

Sonus Faber Concertino G4: Two-minute review

The Sonus Faber Concertino G4 are a very posh set of passive bookshelf speakers. That poshness isn’t just imbued by the colour palette and material choices that define their physical form, even though they do help a bit. Nor is that poshness fully explained by the not-inconsiderable $5,000 / £4,625 / AU$9,495 price point, though, again, that cost does its own fair share of heavy lifting on that front.

The poshness of these posh speakers comes, in my opinion, from Sonus Faber’s dedication to detail. So much attention has been paid to the design, construction, and resulting sound of these speakers, creating an experience arguably greater than the sum of its parts.

On the sound front, these speakers sound unsurprisingly excellent. The two-way design provides for both rich, detailed bass and generous, airy high-end – balanced to the point of tasteful sweetness. There’s a real tactility to the sound produced by the Sonus Faber Concertino G4, as if you could reach behind each instrument or sound source and cup it in your hands. This incredible, three-dimensional resolution is caveated by some serious directionality, but having to sit before your speakers for optimal results is neither a problem, nor anything new.

Visually, it’s hard to beat those walnut sides – but the vegan Ohoskin leather cladding gives it a good old college try. The brass accents consummate the executive nature of these speakers’ design, and the high attention to detail paid in their execution. If you’ve the figurative brass to spare, and are willing to buy more than a great pair of speakers, here’s where to start looking. Among the best stereo speakers money can buy? Absolutely.

Sonus Faber Concertino G4 review: Price & release date

• Released September, 2024
• Priced $5,000 / £4,625 / AU$9,495

The Sonus Faber Concertino G4 are something of a celebration for the Italian brand – specifically, an anniversary. It’s been 30 years since the first Concertinos made it to listening rooms around the world, and Sonus Faber has deigned to mark the occasion with this special revisit to its classic design.

The first 300 pairs of the Concertino G4 are numbered via a unique brass plate on the left cheek, and sold as the Concertino G4 Maestro Edition; the pair reviewed here is number 29. The occasion, the numbering of the first out of the gate, and the brand from which they hail are all overt clues as to the lofty space these audiophile bookshelfs aim to occupy on the market. The other is the price – $5,000 / £4,625 / AU$9,495 per pair, with purpose-designed iron stands coming in at an extra $1,500 / £1,375/ AU$2,875 (approx.).

These are by no means the most expensive speakers you’ll see from Sonus Faber – indeed, they actually sit quite comfortably at the cheaper end of the brand’s (dauntingly broad) price bracket – but they are nonetheless considerably pricy objects d’art. How do you think they hold up?

Sonus Faber Concertino G4 review: Specs

Sonus Faber Concertino G4 review: Features

• Passive, bi-wirable two-way speakers
• Unique cork damping
• Look at ‘em!

The Sonus Faber Concertino G4 are a pair of passive two-way bookshelf speakers, but also probably the most beautiful pair of passive two-way bookshelf speakers I did ever see. I’ll be breaking down the impeccable aesthetic design of these bookshelfs a little later, but for now – quelle finesse!

Being a passive set of hi-fi speakers, the Concertino G4 are fundamentally uncomplicated and untroubled by the shoehorning-in of needless techy fripperies. However, there are some very nifty goings-on within, that make for a sound as phenomenal as the look. More specifically, the Concertino G4 utilize some precision-modeled cork damping material inside, which does a remarkable job of reducing internal resonances (and, I like to think, contributes a certain ‘springiness’ to the resulting sound of these excellent speakers).

This cork damping is paired, for the first time in Sonus Faber’s history, with a mid-woofer – a 5-inch paper-pulp, long-throw mid-woofer that goes some way to defining the brand’s sonic signature. Couple this with a 1-inch silk-dome tweeter, and you have a stunningly broad, stunningly rich set of living room listeners.

The speakers are, of course, bi-wirable; what else would you expect from a two-way speaker at this price? This writer doesn’t subscribe to the idea that running a bi-wired speaker system results in any tangible sonic improvements whatsoever, but bi-amping is a very different thing entirely – and something the Concertino G4 promise to benefit from all the more.

In the box, you’ll find the speakers, some optional magnetically attachable grille cloth covers, and, if you’re lucky enough to get a double-digit Maestro Edition, one of 100 hand-printed artworks – a copy of an etching, illustrating the Concertino G4’s unique internal damping, delivered in an embossed manila envelope. As far as ‘box candy’ is concerned, this is an excellent little gift, especially for the monumental shame that such downright cool designs are permanently, necessarily hidden from view.

• Features score: 4.5/5

Sonus Faber Concertino G4 review: Sound quality

• Exceptional dimensionality
• Sonorous low-end
• Generous, airy high-end

Holy hell.

Being a writer of variable income (that is, varying somewhere between 'ramen noodles every night' and 'slightly posher ramen noodles every night'), I tend to champion the cheaper stuff over anything. Particularly so when returns diminish starkly after a certain price cut-off, and especially where it’s obvious that a premium brand is cashing in on its perceived pedigree as opposed to offering anything of serious value.

As such, it’s rare for me to recognize anything asking upwards of $2000 as 'worth it'. But the Concertino G4 are exceedingly hard to turn down, simply for the rapturous quality of sound they dare to bring into my humble living room.

I use ‘three-dimensional’ a lot as a term when describing the structure and texture of a given device’s auditory performance, and am forced to again here – but in full acknowledgement that this is about as three-dimensional as any bookshelfs can be. The platonic ideal. The dragon I’ll be chasing for decades to come.

Rich(ard) Dawson’s End of the Middle is a record rich (geddit?) in raw percussive instrumentation, blooming low-tuned guitars and alternately plain-spoken/high-falsetto’d art-folk tales of the unexpected. Through the Concertino G4s, Dawson’s heartbreaking windows into the banal (played from a 12-inch on my Victrola Stream Sapphire) are rendered with stunning richness and clarity.

Aptly for the Sonus Faber name, these are sonorous speakers. The low-end is unbelievably rich and structured; it’s rare to feel like you can reach behind the bass strings and grasp the thick air in their wake. Dawson’s voice is rich [that's enough now – Ed.], complex, and fully present – his fricatives feel as if formed in the room.

High-end information is rendered generously. There’s a sense that all higher elements sit plushly within a cushion of air, presenting themselves forth for scrutiny without force or strain – the same force and strain that, in my self-invented mythos of sound, causes tinniness, cloy or otherwise intolerable screech from lesser sources.

The balance of sound is hugely directional. If you, like me, place these facing across a room as opposed to down it, you’re likely to find patches of especial untamed bass-i-ness. Unsurprisingly enough, if you situate yourself where Sonus Faber’s manual actually instructs you to – that is, dead in front, with the speakers facing you, as one point of an audiophile equilateral triangle – the fruits of the Concertinos’ labor make the sense they’re supposed to make.

Dirty Projectors’ Swing Lo Magellan, also listened to on vinyl, is every bit as immediate as your mind’s ear interprets it. It might be a bit dross to fall on the word ‘musical’ to describe the Concertino G4 here, but here we go nonetheless – the subby kicks of opener Offspring Are Blank are discrete, weighted and musical, a far cry from the placeless wub lesser speakers would offer up as alternative.

As Offspring…’s pre-chorus opens out with twanging guitars, there’s a spring in the step – a delightful bounce emphasized by the rubbery drums and densely sponged short-scale bass of ensuing track About To Die. Percussion throughout the album is supple and giving despite its forefront presence, and David Longstreth’s dry, dead-center vocals are a floaty, reedy delight. My album favourite, The Socialites, has a weight and focus I’ve not heard elsewhere. It's a unique joy.

Speaking of which, the Concertino G4 has no issue bringing that same weight and focus to famously less-focused records, like My Bloody Valentine’s Loveless. Kevin Shields’ stacked soundscapes throb and thrum with excitable energy throughout, while the dead, motorik drums at the center of When You Sleep punch out from behind as if pummeled by a hammer. Side B loud-lullaby Sometimes is a glorious bath of multi-tracked guitars and rabbit-heartbeat kicks, distinct in its indistinctness and clear in its complete lack of conventional clarity. A beautiful paradox delivered through these speakers.

The word I keep returning to with these speakers is ‘generous’. There’s space in and around everything tackled, from distant roomy drums to attention-begging upfront vocals – space enough you genuinely feel as if you could cup each element in your hands, or awkwardly reach around them to grab something. Aside from their clear preference for head-on listening (which is, assuredly, of necessity and by design), these speakers are functionally faultless.

• Sound quality score: 5/5

Sonus Faber Concertino G4 review: Design

• Executive walnut and brass build
• Delicious vegan leather cladding
• Nifty magnetically attachable clothe grille covers

Design-wise, it’s hard to know where to start with the Concertino G4s because of Sonus Faber’s trademark meticulousness. Each speaker is a work of art, exuding craftsmanship from every angle. They benefit from beautifully shaped walnut cheeks, with an outward crease that runs from bottom to top, front to rear, and bisect the trapezoidal shape of the whole thing in a very pleasing manner.

New here is the involvement of Ohoskin, an Italian manufacturer of high-quality leather alternatives. This bio-based leather material (made from orange and cactus byproducts) is eco-conscious, sure, but also a stunning ‘pleather’ that clads the top and front of the chassis. It certainly could’ve fooled me.

Between this sleek black not-actually-leather and the solid walnut cheeks, these are a distinctly executive set of audiophile speakers, enhanced further by the mirror-polished brass that forms its front logo panels, rear terminal plates and side-mounted issue number placards. Even the studs holding those walnut cheeks in place are highly reflective, monogrammed indications of attention to detail.

That same attention to detail gifts us sleekness elsewhere. Sonus Faber supplies you with a pair of lightweight cloth grille covers, which you may optionally attach to the front of the Concertino G4 by way of some concealed magnets beneath the pleather.

Now, I think these speakers look far better in their uncovered glory, both for generally preferring uncovered hi-fi speakers and for having my own aesthetic misgivings around the covers' design. Still, the option is a nice one to have, and well-executed besides – from the completely invisible magnets to the soft felt material covering the ‘feet’ on the covers themselves.

• Design score: 5/5

Sonus Faber Concertino G4 review: Value

• Commands a considerable price
• But represents more than just ‘good sound’
• Clearly made with skill, reverence and love

When buying the Sonus Faber Concertino G4, you’re actually buying at least two things, not one. Yes, one of them is an excellent-sounding pair of bookshelf speakers, but you’re also buying an immaculately designed, reverently constructed pair of artworks for your living space. On top of that, if you buy the Maestro Edition, you’re also buying a secret third thing – a limited-edition set, made all the more valuable for its combination of rarity and pedigree. It is with this in mind that I suggest, humbly, that value is difficult to ascribe to this set of speakers.

I’ve heard dozens upon dozens of bookshelf speakers below £1,000 – and even owned a fair few second-hand speakers bought for below £100 – that display similarly remarkable attention to detail in the audio realm, even if their chassis leave a little to be desired. Yet all fall short, however marginally, of the dimensionality on display here. Buying the Concertino G4 for performance alone could be justifiable, yes, but only if you’re willing to throw an extra £3,500 at the extra 5-10% that elevates these speakers above their upper mid-range contemporaries.

Don’t get me wrong, I love the Concertino G4s. It’s a rare pair of speakers that can so convincingly render voices and instruments in discrete three-dimensional space, and nothing short of magic to hear the care with which such sound sources are treated. But you can find this for less. What you can’t is the Italian-made, executive-saloon suavity of the Concertino’s form, or the combination of this hand-built reverence with such deferent approaches to audiophilia.

So, while I might not be currently tempted to sell my belongings in favor of owning the Sonus Faber Concertino G4, I do know that, with the right capital and in the right atmospheric conditions, I’d snap them up in a heartbeat. Not just for their impeccable sound, but for the space they command, and for what that command represents.

• Value score: 4.5/5

Sonus Faber Concertino G4 review: scorecard

Should you buy the Sonus Faber Concertino G4?

Buy them if...

Don't buy them if...

Also consider

How I tested the Sonus Faber Concertino G4

• Tested for four weeks
• Used in my living room, as my primary listening speakers
• Tested using a Victrola Stream Sapphire and Cambridge Audio receiver

As someone with considerable personal and professional investment both in the enjoyment of music and in its production, I have unique experience on both sides of the equation. I engage with speakers of various types as a matter of course each day, from flat-response studio monitor speakers to gorgeous, flattering hi-fi numbers like these.

For four glorious weeks, the Sonus Faber Concertino G4 speakers were my primary listening speakers in my living room. I wired them into my Cambridge Audio Azur 540r receiver, which received the sound of my vinyl record collection via a Victrola Stream Sapphire turntable (outfitted with an Ortofon 2M Blue cartridge).

First reviewed: July 2025

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