I tested the solid budget IEMs that bring Astell & Kern’s audiophile talents to the masses, and they go hard in ways I didn’t expect

Activo Volcano review

Astell & Kern’s lifestyle-focused sub-brand is back with a new offering, the Activo Volcano. These wired in-ear headphones aim to bring audiophile-quality sound to all, combining supposedly “vibrant, immersive sound” at an easy-to-swallow price.

Specifically, the Activo Volcano IEMs will set you back $80 / £99 (about AU$120), which is considerably – and I mean considerably – cheaper than most of the brand’s oeuvre to date. As well as carrying a modest price tag, the Activo Volcano come with a 3.5mm, 4.4mm, and a USB-C connector, meaning they’re available to a broad audience, across a broad range of devices. But is Activo’s budget offering a hit?

Well, to some degree, I’d answer that with a resounding yes. That ability to cycle through various connectivity options is something many of the best wired earbuds skip out on and to be clear, the Activo Volcano execute this fantastically well. Simply unscrew whichever connector is in use and swivel the desired alternative on – that’s all there is to it.

There’s a handy carry case included too, so you can store the out-of-use adapters when you’re on the go. On top of that, you get a nice selection of both foam and rubber eartips in a range of sizes. After you’ve found the right fit, you should get a tight seal, ensuring you hear their various drivers at their best and with commendable passive noise isolation. Activo’s decision to pack all of this in at such an uncharacteristically low price-point is certainly something to be applauded.

Where I become – let’s say, a little more picky – is in the audio department. Yes, this is a product from the Astell & Kern ecosystem, but if you’re expecting truly premium high-grade sound, you’re going to have to look elsewhere. Do the Activo Volcano sound poor, then? Absolutely not. But if you want the most intricately detailed sound around, you will need to spend more.

So, let’s really zoom in on how the Activo Volcano sound. Each earpiece boasts a triple driver design: a main 8mm unit partnered with two 6mm drivers. This configuration, says Activo, is intended to enhance the richness of lower-midrange and bass. And perhaps as the name suggests, you can hear rumbling bass erupt from the get-go.

Yep, you’re gonna sense a significant emphasis on low-end output with these in-ears – something that perhaps a lot of IEMs hesitate to go too hard on. When tuning into Breather by Chris Stussy & S. A. M., I was struck by palpable low-end output, with the Volcano easily able to replicate the track’s pounding drum machine.

Activo compares these IEM’s low frequency output to the “eruption of magma” from a Volcano. And although you’re not going to get that ultra-immersive, almost tangible boom that some of the best over-ear headphones can deliver, say, I’d argue there’s enough depth here for fans of bass-heavy bangers to sink their teeth into.

I’ll admit, I certainly do enjoy a slight emphasis towards bass registers, especially given that I predominantly listen to a mixture of funk, dance, and jazz fusion. But many looking for a flashy new pair of IEMs – whether musicians, audiophiles, or just casual listeners – may be hoping for a more neutral sound signature. And that is something you’re not going to get out of the gate here.

When listening to Flying Beagle by Himiko Kikuchi, I felt the low-end could sound a little overstated, not giving quite enough room for the flowing piano to sit forward and work its magic, while letting light percussion roll through the backdrop. And when listening to Splash Mountain by Yung Gravy, an already bassy track, I felt that both the low-end and treble were a touch aggressive, meaning vocals in the mid-range were left behind. That’s not to say that the Volcano are regularly harsh-sounding or typically deliver muddy audio, but just know that there are more well-rounded options out there.

For instance, I switched over to my Sennheiser IE 200, which are among my very favorite IEMs, and cost a very similar amount to the Volcano. As soon as I did this, I could tell a big difference in quality across all genres. The IE 200, put simply, plate up better balance and instrument separation, meaning you get a more nuanced, revealing listen.

Even still, the Volcano aren’t going to smack you with distorted or tinny sound. Generally, I found tracks were clear and there were noticeable details, such as light electronica in Black Eye by Allie X, that didn’t go amiss. And if you customize EQ in your source device or streaming app’s settings, you’ll be able to get a more neutral sound – or not – depending on what you’re into. But, all in all, I’d be lying if I said these blew me away, sonically speaking.

Unfortunately, I’m not done with my criticism of these IEMs just yet, though. If I’m honest, there’s not a ton that I love about their design. First of all, I want to talk about looks. Now, Activo says that the Volcano have a “crater-inspired” design that symbolizes the “immense power and energy” of their triple drivers.

But really, I’m getting moon crater, rather than volcanic crater from these – especially given the white and silver finish that’s been selected here. I also moaned at Tribit earlier this year after the Tribit Stormbox Lava speaker totally failed at playing to its open-goal volcanic theme. Any audio manufacturers out there fancy making a more fun volcano-inspired product? I’ll be keeping an eye out.

On top of that, I just found the Volcano earpieces a bit too bulky in my ear. Each bud felt substantially heftier than my IE 200 and I found it challenging to keep these on for much more than an hour or so before fatigue kicked in. The cable is pretty chunky too and is without playback options or a mic – something you’d get from a rival like the Shure Aonic 3.

But it’s not all doom and gloom. I have to say, the build of the Activo Volcano appears more luxurious than perhaps its price suggests. The cable, while large, looks and feels high in quality. It’s also detachable if you want to swap in an after-market alternative. For reference, though, the included wire is made up of seven-strand silver-plated copper and five-strand oxygen-free copper cables. The PC material used for the buds themselves also feels smooth and not overly plasticky, oozing a sense of durability and reliability.

So, let’s return to the all-important question. Are the Activo Volcano a hit? Well, perhaps not quite. There’s plenty to like here for sure, whether that be weighty bass output, high build quality or various connectivity options. But equally, there are a few areas that left me a touch disappointed. I personally found that the model is overly large, with a design that while secure and easy to fit, isn’t particularly comfortable or on-theme. And the audio – though still good for the price – could be more revealing and balanced.

Should you buy the Activo Volcano? Well, if you don’t need fantastic evenness across the frequencies and don’t mind it’s slightly larger feel, then perhaps. But for a similar price, I’d say you’ll be better off with the Sennheiser IE 200 – did I mention I like those?

Activo Volcano review: Price and release date

• $80 / £99 (about AU$120)
• Launched in March 2025

The Activo Volcano IEMs came to market in March 2025. Activo is still fairly fresh and was created by parent Astell & Kern as a lifestyle brand. And the Volcano are its cheapest offering to date, with a list price of $80 / £99 (about AU$120). That’s a massive chunk less than Activo’s previous effort, the Activo Q1 IEMs, which we rated four-and-a-half stars, lauding their excellent clarity and superb separation.

Activo Volcano review: Specs

Should you buy the Activo Volcano?

Buy them if...

Don't buy them if...

Activo Volcano review: Also consider

How I tested the Activo Volcano

• Tested for multiple weeks
• Used in the office and while on a flight
• Predominantly tested using Tidal

I used the Activo Volcano over the course of multiple weeks. I predominantly tested them while working at home, but also used them at the office and while on a flight. When listening to tunes, I mainly turned to Tidal, but I also spent some time blasting songs on Spotify.

When testing, I ran through the entirety of the TechRadar testing playlist, which contains tracks from a variety of genres. I also compared the Volcano against the Sennheiser IE 200 and re-released version of the Master & Dynamic ME05.

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