Lily Audio Genesis One

A US-made open-back built around a genuinely novel piezoelectric transducer

First, an apology for how long this update has taken. Part of the delay was simply travel — I was at Vienna High End going hands-on with a huge range of new gear — but part of it was deliberate: I had spotted an amplifier at the show that looked like it might be an unusually good electrical match for the Genesis One, the new Aune A17, and I wanted to see whether I could get hold of one before finishing this piece rather than publish an incomplete gear-matching picture. That amplifier is discussed in detail in the Gear Matching section below, alongside a proper look at why voltage — not power — is the thing this headphone actually needs.

The Genesis One is a boutique open-back headphone, made in the USA by Lily Audio, built around their own CrystalCore transducer. Lily Audio’s pitch is unusual, and — unlike a lot of “unique driver” marketing in this hobby — it genuinely is unique: rather than a planar, electrostatic or conventional dynamic driver, the CrystalCore is a piezoelectric transducer. A crystal element physically flexes when a voltage is applied across it, and that bending motion drives a separate, stiff diaphragm rather than moving air directly — which lets Lily Audio optimise the actuator and the diaphragm independently. It is the same basic principle used in some micro-speakers, scaled up and refined for headphone use, and it is intended to surpass electrostatic designs in transient speed while making the headphone “disappear” so music arrives with the scale and openness of a loudspeaker system.

At $1,200 it is a serious, niche proposition — an ambitious, technically-minded design aimed squarely at listeners chasing resolution, speed and spatial accuracy rather than a warm or intimate presentation. As you would expect from that brief, it is also a demanding headphone — both to drive and to get the best from — which is the part of the story this review focuses on.

A note up front: the Genesis One is hard enough to drive that the source and amplification matter more than usual — there is a dedicated gear-matching section below covering what had enough power and what fell short. The most useful thing I can tell you is how it behaves and what it takes to make it sing. But first, let’s take a look at what’s in the box.

Unboxing and Packaging

The Genesis One arrives in a understated kraft box with a line drawing of the headphone and the tagline “A New Standard in Sound”:

The lid leans on the transducer technology — though it is worth a small smile that the box prints it as “Crysta Core™” while the earcups themselves read “CrystalCore™”:

Inside the shipping carton the hard case is bagged and protected:

The case itself is a proper zip-up clamshell with the Lily Audio signature on the lid, sitting alongside the product box:

Opening it up, the headphone and braided cable are coiled into the moulded base, with a spare pad held in the mesh lid pocket:

The empty case shows the headphone-shaped moulding that keeps everything in place in transit:

Design and Build Quality

The Genesis One is a serious-looking open-back. The earcups carry a circular grille ringed with “CRYSTALCORE™ COMPOSITE” and “MADE IN THE USA”, with a textured chevron bar across the centre and a small Lily Audio badge:

The grille is properly open — you can see straight through the hex lattice to the structural vanes behind the transducer — and it photographs nicely against a wood surface:

The earcups are clearly labelled, with a “G1” marking on the yoke and a 3.5mm socket for the detachable cable on each side:

Looking into the pad opening you can see the transducer itself — a dark disc set behind the structural webbing:

Fit and Comfort

Lily Audio designed the Genesis One for low clamping force and even pressure distribution, and in use that holds up — it is a comfortable headphone for long sessions. A big part of that is the suspension system: a wide, perforated leather strap carried on twin composite headband rails that spreads the weight gently across the head:

The strap attaches to the yokes with an elasticated mount, and the whole assembly is light and flexible:

The yoke blocks are clearly channel-marked and the textured composite finish runs throughout:

Weighed and Compared Against the Collection

Because this is a headphone that lives or dies by pairing, I wanted to see how it physically sits alongside the rest of the collection rather than review it in isolation. Lined up against a run of open-back planars and dynamics, the Genesis One’s hex-grille CrystalCore composite earcup is immediately the odd one out — everything else in the shot is either a conventional round grille or a planar honeycomb, and the Genesis One’s angular chevron bar and hexagonal lattice stand apart from both:

Arranged in a circle with the rest of the open-back collection, it holds its own on presence alone — the composite earcup and exposed structural vanes give it a more industrial, engineered look than most of the planars and dynamics around it:

On the scale, the weight is lower than the substantial-looking composite earcups suggest — this is a comfortable headphone precisely because Lily Audio kept the mass down despite the large pad openings and structural bulk. The Yamaha YH-4000, the orthodynamic I weighed alongside it for reference, comes in lighter still, but that comparison needs context rather than a straight “lighter is better” reading: the YH-4000 is a considerably more expensive flagship with a much more esoteric orthodynamic tuning, so its lighter weight is one advantage among a very different set of trade-offs, not evidence that the Genesis One is heavy for what it is.

Pulling the earpads and earcups out of several headphones at once for a side-by-side also makes the Genesis One’s pad depth and opening size easy to place relative to the rest of the collection — it sits in the middle of the pack rather than at either extreme, which is part of why its two interchangeable pad options are able to cover such a useful tuning range:

Earpads and Tuning Accessories

This is one of the Genesis One’s more interesting features. Earlier pre-production units shipped with four earpad options, but the final, kickstarter-fulfilment production version — the one reviewed here — settles on two: a perforated leather pair and a velour pair, each with a different acoustic character so that you can subtly shape the response to taste. The pads are part of the tuning system rather than just comfort spares:

Independent measurements from oratory1990 back up what the pads are doing acoustically: the velour pads carry more bass and slightly less midrange than the leather pads, with no meaningful difference at the very top end — which effectively makes the velour pads the more V-shaped-sounding of the two. My own measurements against a FiiO K17 point at the same conclusion from a different angle: swapping between the stock and alternate pad sets, the default (leather) pads measured smoother through the 2–10kHz region than the velour (“suede”) pads, which showed more ragged peaks and dips over the same range:

Looking closely at the pad interior also shows exactly why the earpads matter so much here: sitting directly in front of the transducer, behind the foam liner, is a circular damping disc — Lily Audio’s take on the fabric-screen-in-front-of-the-driver idea also used on Sennheiser’s HD800. oratory1990’s testing of that screen found it applies real, deliberate damping: removing it drops output through 2–5kHz and raises it above 5kHz, and stacking a second screen on top pushes the treble down further still — which tells you Lily Audio, and by extension you, has a genuine lever to pull if the stock tuning is still too hot for your taste:

There is also a passive low-pass filter accessory that lets you bring the treble level down further — which, as the sound section explains, is a feature this headphone benefits from in practice. Between the swappable pads, the damping disc, and the filter, there is real scope to tune the Genesis One to your preference and to your source.

Cable

The supplied cable is a thick, black braided lead with a dual-entry design — separate connectors for the left and right earcups:

The headphone-end connectors are gold-plated 3.5mm plugs, clearly marked L and R, and the source end on this unit is a 4.4mm balanced plug:

The connectors seat positively into the earcup sockets:

Sound Impressions

The honest headline is that the Genesis One is one of the more demanding headphones I have used, in two distinct ways: it is hard to drive, and out of the box it has too much treble.

The drive difficulty is real, and the electrical explanation is more interesting than a simple sensitivity spec suggests. Because the CrystalCore transducer is piezoelectric rather than a moving-coil design, it behaves electrically like a capacitor rather than a resistor — oratory1990 measured it at roughly 160nF, which puts its impedance at around 100 kΩ at 20Hz, dropping to still over 100Ω by 10kHz. A load like that draws almost no current — even 10Vrms only pulls about 17mA — but it needs real voltage to reach a normal listening level, because the piezoelectric effect itself is roughly an order of magnitude weaker than the Lorentz force that drives a conventional dynamic driver. Measured sensitivity sits in the 74–76 dB/V range across the two independent measurements I’ve been able to compare it against, which is very low, and Lily Audio’s own recommendation of an amplifier capable of more than 10V output is really a minimum rather than a target — Solderdude at diyaudioheaven puts the practically-useful minimum closer to 17V, and specifically warns against Class D amplifiers here, since a capacitive load like this can push a Class D output stage into instability or overcurrent. Class AB or Class A amplification is the safe, recommended territory. The Gear Matching section below goes into exactly which amplifiers managed it and which fell short, along with why voltage headroom specifically — not power on a spec sheet — is the thing to chase.

The treble is the other half of the story, and here it matters which unit you are reading about. I want to flag this clearly: early press coverage of the Genesis One, from before Lily Audio’s kickstarter-fulfilment production run, described a genuinely fatiguing amount of treble energy. The unit reviewed here is a production sample with the current damping treatment in place, and it measures — and sounds — meaningfully calmer up top than those first-batch reports, though there is still real energy in the top end that most listeners will want to tame further. The mechanism is a fabric damping screen sitting directly in front of the driver, similar in concept to the screen in a Sennheiser HD800; oratory1990’s testing of it found that removing the screen entirely raises output above 5kHz substantially, and that adding a second screen on top lowers it further still, which confirms Lily Audio has real, deliberate control over this rather than it being an accident of the driver.

Even with the production damping in place, my own preference is to take the treble down a further notch beyond what ships as standard. PEQ is the obvious tool for that — I used a JDS Labs Core desktop amp/DAC’s onboard parametric EQ to apply a gentle high-shelf cut of around -2dB from 6.5kHz up, and separately tried the same idea as a high-shelf on a Topping DX5 II — and either approach brings the response into a genuinely excellent place:

And there is a lower-tech fix that works surprisingly well if you don’t want to touch EQ at all: the classic trick of one or two layers of tissue over the driver noticeably reduces the treble and, in my experience, gets you most of the way to the same result. The supplied passive low-pass filter accessory is Lily Audio’s own, more polished version of that same idea.

Once tamed, the qualities the design is chasing do come through, and this is where the Genesis One earns real credit. The CrystalCore transducer is fast and transparent, and the open-back presentation has the wide, out-of-the-head, loudspeaker-like staging that Lily Audio describe — on “Hotel California” by the Eagles the image opens out well beyond the earcups. There is also real bass for an open-back; the low end has weight and a subtle physical presence, and on “Angel” by Massive Attack the sub-bass is present rather than merely implied. Importantly, the bass needs no help — it is already excellent, and I would not try to push it further with EQ. The overall shape, once the treble is brought under control, is a nicely engaging V-shape rather than anything neutral — detail-forward and exciting rather than polite. But that treble has to be addressed first: until it is, the headphone’s strengths are hard to appreciate, and on a bright track like “Close to Me” by The Cure the stock top end is the first thing you notice rather than the last.

For a second, independently-measured opinion on all of this — impedance, sensitivity, earpad and damping-screen behaviour, and distortion — I’d point readers to both oratory1990’s measurements and Solderdude’s review at diyaudioheaven. Both are more rigorously instrumented than anything I can do at home, and my thanks to both of them for measurements I’ve been able to lean on and cross-check against my own findings throughout this review.

Gear Matching

Because the Genesis One is so demanding, amplifier pairing is the single most important practical consideration — more so than with almost any other headphone I have used. Here is what I found with the sources I tried, plus the amplifiers themselves:

At the bottom end of the scale, the CrinEar Daybreak simply was not powerful enough to drive it properly. The FiiO QX11 could just about do it, but only at high gain and maximum volume — there was essentially no headroom left. The Luxsin X9 was similar: it would drive the Genesis One, but again it needed high gain and almost its full output to do so. The pairing that worked at the desktop end was the FiiO K17 and the Aune N7, both of which had the voltage swing to give the headphone real room to breathe; the Fosi Audio GR70 tube amplifier, using its High-Z output option, also worked well.

I measured this directly rather than just going on impression, running the Genesis One at maximum volume on each amplifier and comparing the resulting output level. The K17 and the N7 track each other closely and sit comfortably highest across the whole range; the Luxsin X9 and a Topping DX5 II both run out of headroom noticeably earlier, landing 10–15dB lower through the bass and midrange before the amplifiers’ own limits start to compress the signal:

Why this is about voltage, not power

It’s worth being precise about what “enough amplifier” actually means here, because a frequency response measurement on its own can hide the problem. FR sweeps are normally run at a fixed, moderate level with no large transient peaks, so they show you tonal balance — they do not show what happens when an underpowered amplifier runs out of voltage on a drum hit or an orchestral swell. When that happens, the very top of the transient gets clipped: the average level and the tonal balance both stay correct, but the peak does not, and you don’t perceive it as “missing frequency response” — you perceive it as reduced punch, reduced dynamic contrast, and on louder passages, a harshness that has nothing to do with the headphone’s actual tuning. This is a large part of why a more powerful amplifier is so often described as sounding “effortless” or “relaxed” even at matched average volume: it is usually reproducing peaks cleanly that a weaker amplifier is quietly rounding off.

For the Genesis One specifically, the amplifier’s real job is voltage, not current. Because the CrystalCore transducer behaves as a capacitor rather than a resistive load, it draws very little current at any practical listening level — the limiting factor is purely how much voltage swing the amplifier can deliver before it clips. That is also why a headline power figure into 32Ω tells you almost nothing useful about how an amplifier will handle this headphone; what actually matters is the maximum voltage it can sustain into a very light, high-impedance load, which is a very different thing from raw wattage into a typical dynamic driver.

The Aune A17 — an amplifier that may be an exceptional match

This is the amplifier I mentioned at the top of this review. I haven’t got a review sample in hand yet, but Aune’s published power-versus-load table for the A17’s balanced output is unusually informative, and it’s worth walking through why. Rather than a single “11.5W into 32Ω” headline figure, Aune publish output power across a whole range of loads, which lets you back-calculate the maximum RMS voltage the amplifier can sustain at each one: roughly 19.2Vrms at 32Ω, and still 19.3–19.6Vrms all the way out to 600Ω. A voltage figure that stays essentially flat as the load impedance rises is exactly what you want to see — it tells you the amplifier is voltage-limited rather than current-limited, that it holds nearly its full voltage swing into light loads, and that the published figures are internally consistent with each other rather than being cherry-picked.

By comparison, FiiO’s own published figures put the K17’s balanced output at roughly 17Vrms — a real amplifier and a strong performer here, as my own measurements above confirm, but with somewhat less headroom than the A17 appears to offer on paper. Lily Audio’s own guidance for the Genesis One is for an amplifier capable of more than 10V, with an ideal closer to 20V for unrestricted dynamic headroom; the A17’s ~19.5Vrms balanced output lands almost exactly on that ideal figure. If the numbers hold up in practice, that would put it slightly ahead of the K17 specifically as a voltage source for this headphone, even though the two are much closer than that gap suggests for most other headphones.

The A17’s rated ±15V output rails initially look hard to square with a 19.5Vrms balanced result, but Aune’s own published architecture explains it: the A17 runs separate supply rails for its preamp stage (±20V) and its output stage (±15V), with three pairs of output transistors per channel in a fully balanced, Class A topology — which is a plausible route to that voltage figure without the numbers being inconsistent. I’d rather trust a power-versus-load table that holds together across seven different impedances than dismiss it over a rail-voltage figure that doesn’t tell the whole story on its own. I’m hoping to get an A17 in for a proper measured pairing with the Genesis One as a follow-up to this review.

I will be adding pairing notes for the remaining amplifier to this section once tested:

• Schiit Midgard — to be tested

Specifications

A note on the cable: Lily Audio’s published specification lists a detachable 3.5mm cable with a 6.3mm screw-on adapter, while the unit reviewed here came terminated in a 4.4mm balanced plug at the source end — worth confirming which termination ships with a given order.

A note on “impedance”: Lily Audio, like most manufacturers, quotes a single nominal impedance figure, but because the CrystalCore driver is piezoelectric rather than a moving coil, it behaves electrically as a capacitor rather than a resistor — its impedance falls steeply from over 100 kΩ at 20Hz to well under 1 kΩ by 10kHz. That single “>300Ω” figure is a simplification of a much more interesting real curve, and it’s also why pairing this headphone with a high-output-impedance source (an OTL tube amp, in particular) will roll off the treble far more than the same source would on a conventional dynamic or planar headphone — the amplifier’s output resistance and the driver’s capacitance form an unintentional low-pass filter.

Rating Explanation

The Pragmatic Rating of 3 reflects a headphone with genuine high-end ambitions and real strengths — speed, transparency, openness and the no-EQ-needed bass described above — held back by how much work and how much amplifier it takes to get there. It is hard to drive and treble-forward in stock form, and it only reaches its potential with a powerful enough amplifier plus a treble cut via EQ or physical damping. Get those two things right and it works really well; but those are real conditions, and they are why this lands as a niche product rather than an easy recommendation.

The build, comfort and the thoughtful tuning system — two earpad options, a damping screen Lily Audio can and does adjust between production runs, and a passive treble filter — are genuine positives and the main reason the Features score sits higher. The Measurements score reflects the stock treble balance and capacitive-load behaviour rather than any fundamental flaw; corrected, the response is very good. Worth repeating from the sound section: the bass doesn’t need EQ — the only correction this headphone needs is downward, on the treble.

This one is squarely for the technically-minded listener who already owns a powerful, high-voltage amplifier, is comfortable applying PEQ, and specifically wants a fast, loudspeaker-like open-back at $1,200 that they can tune to their taste. For everyone else — anyone wanting plug-and-play, or who does not already have serious amplification — it is the wrong headphone, and I would not recommend it lightly.

Above all, though, I want to be clear about how I feel about this headphone as a category, not just as a product. This is a headphone collector’s headphone. So much of what gets marketed as a “unique driver” in this hobby is really a minor variation on a familiar theme, and the Genesis One is refreshingly not that — a piezoelectric transducer driving a separate diaphragm is a genuinely different way of making sound, not a marketing spin on an existing one. When a company actually tries something new like that, I think it deserves to be cherished even when — especially when — it comes with real compromises. And a final, important caveat if you go looking for other opinions online: be wary of early reviews of the first production batch. Those units were, by most accounts, tuned considerably hotter in the treble than the sample reviewed here; the current, kickstarter-fulfilment units ship with additional damping that brings the top end back into reasonable territory. I’d still personally take it down a little further than even that — via EQ or the tissue trick described above — but the starting point today is a meaningfully different, better headphone than those early reports describe.

Conclusion

The Lily Audio Genesis One is an ambitious, distinctly engineered open-back that aims high with its CrystalCore transducer, and — once you get past the two hurdles of driving it properly and taming its treble — it does open out into the wide, loudspeaker-like staging Lily Audio describe, on tracks like “Hotel California.” With a voltage-capable amplifier and a treble cut via EQ (or even a tissue over the driver), it becomes a detail-forward, exciting V-shaped listen rather than a neutral one, and the bass needs no EQ at all.

But those conditions are the whole story. At $1,200, demanding a high-voltage amplifier and a treble cut to sound its best, this is a niche product rather than an easy recommendation. For the listener who already has the amplification, enjoys dialling a system in, and wants something genuinely different, it is rewarding and worth seeking out. For anyone hoping to plug in and enjoy it straight away, it is not the headphone — and I would point most people elsewhere unless that specific brief is exactly what they are after.

I’ll follow up separately once an Aune A17 sample is in hand to measure the pairing properly rather than on paper alone. Thanks again to Lily Audio for the review sample and for visibly responding to community feedback on the earlier treble tuning between production batches, and to oratory1990 and Solderdude at diyaudioheaven for the independent measurements that let me cross-check and correct my own findings throughout this piece.