Qualio Quantum

by Dawid Grzyb / February 7, 2026

Having made quite a statement with the IQ, Qualio followed up with a more compact yet still rather unorthodox loudspeaker, the Qualio Quantum. Tailored for smaller rooms, it aims to distill the brand’s hybrid thinking into a slimmer, more accessible form. That’s our subject this time around. Enjoy!

Gravity with a Twist

I’ve developed a soft spot for just about everything Cube Audio does. That wasn’t an overnight infatuation but a slow, deliberate process born of repeated exposure and earned respect. Their approach to posh, crossover-less wideband loudspeakers did something quite unusual in a segment often defined by dogma and stubborn purism: it humanized the breed. Instead of treating single-driver speakers as an ascetic, amplifier-hostile pursuit reserved for the most hardened initiates, Cube showed that such designs could remain flexible, approachable and—crucially—compatible with a far broader range of amplification than commonly assumed. You didn’t need a shrine of flea-powered, tube-infused exotica to make them sing. You just needed an amplifier with sufficiently low output impedance—and an open mind. On top of that, Cube Audio speakers simply sound wonderful. They manage to combine immediacy, spatial accuracy and tone in a way that, as a package deal, is very hard to come by elsewhere. To tap into these virtues, a speaker simply needs to belong to the purist, point-source wideband club.That said, as accomplished and alluring as Cube Audio’s products undeniably are, they occupy a very specific niche in the loudspeaker universe. This is not a brand that accidentally stumbles into the living rooms of unsuspecting civilians. These speakers are aimed at listeners who already know what they’re buying, why it works the way it does and which compromises are—or are not—being made. Cube Audio customers tend to be informed, intentional and often well past the entry-level phase of the hobby. That’s not elitism; it’s simply accurate market positioning. Crossover-less wideband speakers remain a specialized proposition, no matter how elegantly executed, and Cube Audio never pretended otherwise. They refined the niche rather than trying to escape it.The people running Cube Audio naturally are perfectly aware of all this. Which is precisely why Qualio exists. Their second brand is not an attempt to dilute Cube’s identity, but rather to redirect accumulated know-how toward a broader audience. Qualio’s mission is simple enough on paper: speakers that are ace on price-to-performance ratio, friendly to mainstream amplification, forgiving in real-world rooms and less reliant on ideological alignment from their owners. In practice, of course, achieving that balance is anything but trivial. Still, the intent was clear from day one: Qualio is where experience meets pragmatism.Crucially, that shift does not make Qualio a “regular” speaker brand. If anything, it makes it interesting. The first Qualio product I encountered—the IQ—made that abundantly clear. Yes, it sounded absolutely amazing for the money, and that alone would have been enough to warrant attention. But what really set it apart was how it went about its business. More than half of its operating bandwidth was executed in dipole fashion, a solution that is anything but commonplace not only in this price range, but in general. In practice, this turned out to be a massive advantage. The sense of space and openness that the IQ provided wasn’t subtle or theoretical—it was immediately audible and consistently beneficial. This wasn’t engineering for the sake of novelty; it was engineering that paid off where it mattered.At the time my review of the IQ was published, this was the only loudspeaker in Qualio’s roster. It didn’t need siblings to make a point. It stood alone, but it stood tall and proud—just enough to become Srajan Ebaen’s daily driver, a role it continues to occupy to this day. The IQ was also reportedly one of the main catalysts for him emptying his loudspeaker stash—a dramatic but telling endorsement if there ever was one. Fast-forward nearly three years from my original IQ review and Qualio’s catalog has grown to three models. Given the amount of press love the IQ received, it’s a safe bet that it remains the brand’s top seller. Today, it’s available both in its original form and as an Ultra version equipped with even fancier parts for those who prefer their refinement served extra thick. Alongside it sits the higher-tier Qualio IQ30, which follows the same topological blueprint but scales up cone area, enclosure size and overall ambition. This is a visibly larger—and financially steeper—design for very large rooms and listeners who want the signature Qualio sound without spatial constraints.I’ve lost track of how many times I’ve recommended the IQ to people asking what speakers they should buy. That’s not marketing copy—it’s lived experience. In my book, on sheer sonic performance alone it delivers more than what 99% of listeners could ever want. It does so without demanding absurd system matching or heroic room treatment. That said, reality still applies. Both the Qualio IQ and the larger IQ30 are physically substantial loudspeakers. They need space, and they don’t pretend otherwise. Not everyone has a room that can accommodate them comfortably, nor should they feel excluded for that reason.Team Qualio is fully aware of this limitation, which brings us neatly to their third speaker and the subject of this review: the Qualio Quantum. This model effectively halves the footprint of the original IQ, immediately repositioning the concept for smaller rooms and a broader audience. Visually, the Quantum might pass for a fairly conventional floorstander—and that’s exactly where assumptions begin to fail. While its dress code may imply safety above all else, this is not a regular speaker. Marek Kostrzyński, Qualio’s main engineer and a well-known figure from his work at Pylon, explained to me that Quantum is, in many ways, the sum of all lessons learned so far across both Cube and Qualio projects. It’s not a downsized IQ nor a compromise design. It’s a distillation—an attempt to condense experience, experimentation and hard-earned insight into a form factor that fits where larger Qualio arsenal simply won’t. And that, as it turns out, makes the Quantum a far more intriguing proposition than its modest dimensions might imply.The Qualio Quantum arrived packed in a single box housing both speakers, each securely nested between thick foam inserts. Unpacking was straightforward and functional, with no superfluous layers or presentation theatrics involved. Each Quantum measures 101 x 20.2 x 29.5 cm (H x W x D) and shows 25 kg on the scale, so despite its clearly slimmer stance than the IQ, this is no lightweight exercise in downsizing. Further specs list a 2.5-way design, 4 Ω nominal impedance, 88 dB efficiency and a bandwidth of 35 Hz–31 kHz. Compared to the IQ, these figures suggest a similar load for amplifiers, albeit in a significantly more compact form clearly aimed at smaller rooms and easier physical integration. Pricing starts at €5’900/pr in standard black or white finishes. Special colors add €200 to the bill, natural wood veneers raise it by €300. Gloss finish costs an additional €800 for natural veneer versions or €400 for all other finishes. All Qualio loudspeakers are covered by a 3-year manufacturer warranty, with worldwide shipping included in the price.Like its larger sibling, the Quantum is a hybrid design that combines a thick, translucent acrylic baffle on top with a vented enclosure below, but the way it allocates drivers between the two is different. The IQ is a 3-way design that executes more than half of its bandwidth in dipole fashion by running both the SB Acoustics Satori 6-inch midrange driver and the Mundorf 17D2.2 AMT open, while its SB Acoustics Satori 9.5-inch woofer inhabits a rear-ported enclosure. The Quantum confines dipole operation strictly to the high frequencies handled by the same AMT, albeit crossed lower to shoulder more responsibility. Its SB Acoustics Satori 6-inch driver with papyrus cone is shared with the IQ, but here it operates as a mid/woofer inside a vented enclosure and is assisted at the bottom by a low-passed 6-inch NRX woofer from the same manufacturer.The product page does not specify exact filter slopes or frequency division, but it does confirm the use of WBT speaker posts and premium crossover parts, including Mundorf capacitors alongside Jantzen air-core inductors and low-loss resistors. A noteworthy detail is the electrical connection between the AMT module and the main enclosure, which is handled via a premium Viborg 3-pin XLR connector. Most shoppers accustomed to the industry’s usual speaker residents won’t immediately associate hybrid designs with visual elegance. Open-baffle elements stacked on deeper enclosures can easily look awkward or unresolved, especially when form takes a back seat to concept. I’m firmly in the camp that when I spend real money on audio gear, I want something that’s pleasant to look at as well. In this context, the Qualio Quantum plays things safer—and arguably smarter—than the already very smart IQ. Its slimmer proportions and narrower frame make it visually easier to digest, while the acrylic AMT baffle adds just enough visual distinction to signal that this isn’t a common floorstander. Rather than dominating the enclosure, it integrates neatly into the overall shape.Build quality leaves little to criticize. The paint finish is even and consistent, panel joins are clean, and driver installation is precise throughout. Combined with premium crossover parts and the tidy execution of the separate AMT module, this points to a product that’s cosmetically fully sorted. Rear-mounted speaker terminals are thoughtfully recessed and flush with the back panel to reduce the risk of accidental damage during transport and unpacking. Unlike the IQ, there are no resistors to swap, so no tuning options to play with here; the Quantum’s voicing is fixed by design, but the overall execution feels deliberate and well thought out rather than simplified. In short, the Quantum looks like a mature, production-ready loudspeaker that just happens to hide a hybrid twist behind a more conventional façade. That it is priced roughly €2,000 less than its larger sibling makes it even more accessible and highly competitive given what it is.The Qualio Quantum proved just as easy to work with as the IQ before it. Toed in to cross at the listening set and pulled clear of the front wall by roughly 1.5 meters, it settled into position without protest and behaved brilliantly on bass, which I’ll get to shortly. Placement required little fuss and offered no immediate incentive to experiment with port plugging or other corrective measures. This also aligned neatly with my usual preferences: whenever speakers allow, I move them as far away from the front wall as practical to maximize imaging depth and ensure that what reaches my ears comes primarily from the drivers rather than early wall reflections. The Quantum made this process refreshingly straightforward, delivering a clear sense of spatial order without demanding obsessive fine-tuning. That was a very good start.Prior to moving forward, it’s only fair to mention that I love dipoles. Their boxless nature, free from internal compression, moves air in a direct, effortless way that’s hard to match, combining speed, scale and room-friendly behavior into one coherent whole. Full-range drivers, in turn, excel at articulation, immediacy, with a kind of spatial presence and imaging specificity that’s equally rare. Qualio IQ stood out because it fused these two worlds into a single design that behaved like a full-ranger infused with spatial grandeur, momentum, energy and other perks specific to the dipole kind… yet remained smaller than most. That combination was clever and, in that execution, unusually well resolved. Although it wasn’t the first of its kind, designs like this remain rare—and rarely this attractive.Vented enclosures allow manufacturers to use smaller woofers by exploiting internal air compression to boost output, something dipole speakers don’t have at their disposal and which explains why they typically rely on much larger bass drivers and baffles. Qualio’s founders wanted a speaker sized for real living rooms, hence the move toward a bass-reflex solution—and it paid off. The IQ’s bass proved unexpectedly deep, controlled and clean. Despite its vented alignment, it behaved more like a well-sorted sealed system: nimble, responsive, textured and powerful without excess or blur, delivering a level of low-frequency composure I simply didn’t see coming. Combined with its dipole traits, this allowed the IQ to handle everything I threw at it with confidence, never calling attention to weaknesses or trade-offs. Music flowed effortlessly, with a strong sense of presence, scale, radiance, vital intensity, and engagement that welcomed extended listening sessions. For the asking price, I couldn’t ask for more. More tellingly, the IQ never felt out of place in a carefully curated system worth considerably more, behaving like a transparent, high-tier component that clearly reflected the character of that rig. It also made one thing obvious: high current and good damping were the clear ticket to arriving there, with class AB bias engaged on my 995R monos proving far more convincing than class A. The IQ’s willingness to expose that difference very clearly was appreciated.With that groundwork out of the way, it’s time to turn to the Quantum. From the get-go, it was obvious that it wasn’t meant to sound like the IQ—and couldn’t, really. In real-world terms, it’s about the same height and depth as my Vox monitors perched on their spindly stands, which already tells you this is a compact proposition. Given its limited internal volume and ported enclosure, I wasn’t expecting anything outrageous in the bass department. Based on past experience, I did expect it to behave well on tone, courtesy of its paper-cone mid/woofer. What I had far less clarity on going in was how the AMT would shape the final outcome—and that’s where things started to get interesting.In spite of its domesticated stature, the Qualio Quantum never struck me as small-sounding in any meaningful sense. Quite the opposite. What I heard was a presentation that leaned dense, earthy and voluptuous, with a sense of substance and gravitas that made my playlist properly grounded and very entertaining, particularly on rock and metal fare. “Anchored” kept coming back in my notes, because nothing here floated aimlessly or lacked ballast. There was real meat on the bones, a reassuring physicality that made the Quantum feel confident and settled rather than eager to impress.That density, however, never tipped into woolliness or syrupy excess. Even with all that weight and saturation, the Quantum didn’t come across as abnormally chunky or slow. When I pushed it too close to the front wall, it could easily overpower my room and excite its modes, which came as no surprise. Rear-ported speakers like space, and the Quantum was no exception. Given the breathing room outlined earlier, its bass became substantial yet pleasantly elastic, nimble and very nicely controlled. As such, it reminded me of the IQ’s character downstairs, just of a somewhat smaller caliber. I could clearly tell this was ported bass, but it was ported bass done right—another moment that confirmed Marek Kostrzyński knew exactly what he was doing.What caught my attention was how that low-end density propagated upward. The sense of weight didn’t stop at the bass line but carried into the upper range as well. Vocals and instruments felt properly fleshed out, colorful and tactile. At this point, the Quantum’s voicing struck me as playful and openly aimed at pleasing the listener: wide color gamut, big tone and an emphasis on qualities that simply make music enjoyable. It clearly wasn’t groomed to chase razor-sharp outlines or ultimate quickness. Instead, it kept pulling my focus toward inner substance, textures and prettiness. Up to that moment, it would have been easy to assume that the Quantum was voiced safely and predictably, behaving much like a very competent ported speaker should. And in a way, that’s exactly how it fared. If that were the full story, I could have stopped there, labeled it as another solid, well-sorted loudspeaker and called it a day.But then there was the AMT—and that’s where the narrative takes a turn. Its contribution was anything but subtle. It didn’t just add a bit of sparkle on top; it injected genuine radiance, openness, and grandeur—the whole dipole vocabulary—into the Quantum’s inherently beefy aesthetic. My point is that there was generous air where things could have stayed comfortably thick, and accurate, finely articulated perspective where conventional box speakers tend to play it safe. In that sense, this compact tweeter mounted on top wasn’t merely a performance enhancer. It was the very element that allowed the Quantum to step beyond what conventional designs usually manage.Metaphorically speaking, if sound were cuisine, the Quantum without its AMT would have been a hearty, nutritious, fat-intense meal—deeply satisfying, but perhaps a touch heavy on the liver. The tweeter brought the seasoning: deeper aroma, brighter notes and a hint of citrus that lifted the whole dish. What could have remained solid comfort food turned into something much closer to fine dining—and the kind that made me want to come back for another serving rather sooner than later. All of the above took shape courtesy of two amplifiers I had at my disposal. One was the Aavik I-588 integrated, a class-D design with very low output impedance and plenty of power on tap. The other was my long-term reference Trilogy 995R two-box set, delivering 200/300 W into 8/4 Ω when run in its class-AB bias. The differences between the two played out exactly as they should have.With the Danish amp in charge, the Quantum felt even more tightly held. Bass turned leaner, more fearless, pounding and better ripped, while images higher up gained finer outlines and a touch of extra specificity as the very result of that. The entire presentation became more energetic and slightly fruitier. Switching back to the Trilogy lowered the system’s center of gravity. Colors grew richer, textures thickened and the sound relaxed into a calmer, more saturated flow. Neither approach felt wrong; each simply emphasized a different facet of the same speaker. The takeaway was straightforward enough: much like the IQ before it, the Quantum truly enjoyed high power and damping. Give it current and control, and it responded willingly, scaling its character rather than fighting it. In that sense, its compact stature never translated into modest ambitions—it behaved like a very serious loudspeaker that just happened to come in a more living-room-friendly size, and a very good one at that. Let’s wrap.

Should we think of the IQ as the brand’s statement piece, the Quantum is its street-smart sibling: smaller, easier to live with, yet carrying far more of the family DNA than its footprint or looks may imply. Don’t let the compact cabinet fool you—this is a dense, grounded, tone-rich performer with a proper dipole twist on top that keeps things airy, insightful and pleasantly addictive. Feed it power from a cost-effective class D amp, give it some space, and it goes to work in a way that reminds you it wasn’t designed by accident. What I really want to say is this: in my room and system, the Quantum was a true ace, and I got more from it than I initially anticipated after my memorable IQ experience. Hats off to Marek and the team for pulling off something this clever, unpretentious and sanely priced. If refrigerator-sized speakers are off the menu, the Quantum absolutely deserves your attention.

Associated Equipment:

Retail prices of reviewed components in EU (incl. VAT):

  • Qualio Quantum (satin black/white): €5’900/pr
  • Special colors/natural veneers: +€200/300
  • Gloss finish for natural veneers/remaining finishes: +€800/400

 

Manufacturer: Qualio

 

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