Letshuoer Sonata - The Warrior and the Goddess

 4.5⭐️

+ Fantastically well-balanced U-shaped tuning that works across any genre

+ Clean and naturally elevated bass response

+ Finely balanced midrange ensures vocals are present but not overbearing 

+ Rolled-off treble done right without a loss of crispness, energy, or detail

+ Great technical performance, including a dimensional soundstage, impressive imaging, and accurate instrument timbre

+ Sturdy titanium alloy shell and eye-catching, intricately designed faceplates

+ Flagship unboxing and accessory package

- The basshead side of me craves just a bit more quantity 

- Would also like a little more warmth and noteweight 

- Shell design may not appeal to some

- Stock cable could be nicer and tie in better with the design theme

- Case is on the larger side and for some reason has card slots (now I've seen it all)

thaslaya's star rating system:

☆☆☆☆☆ - Fantastic!

☆☆☆☆ - Recommended

☆☆☆ - There are buyers but not for me

☆☆ - Can't see the appeal

☆ - Product is a failure

Disclaimer: 

This product was provided to me by Letshuoer in exchange for my impartial and honest review. I receive no compensation, and all thoughts and opinions are my own.

Non-affiliate link for those interested:

https://letshuoer.net/products/letshuoer-sonata

Gear used: 

●Samsung Galaxy S25 Ultra

●Various DAC/amps

Source:

●Listening was done using Amazon Music HD/Ultra HD and local FLAC files. 

Introduction: 

If you've been around the IEM scene for any length of time, you've likely heard of Letshuoer and probably even tried one or more of their products. The company was at the forefront of the planar wars a few years back with its popular budget-friendly S12 series, and more recently, it looked to break the mold of traditional planar tuning with the release of the Ember and the Astralis. Now they're debuting a new flagship IEM that will finally unseat their previous flagship of three years, the Cadenza 12. This new one is called Sonata, and it's basically a full production version of the prototype EJ10. As I understand it, the EJ10 was a small-batch, one-off internal passion project made for a small group of audio enthusiasts, but Letshuoer liked it so much that they decided to release it to the public with a few tweaks. The Sonata utilizes a 10-driver tribrid configuration with two dynamic, four balanced armature, and four electrostatic drivers and comes with a price tag of $2,300, making it Letshuoer's most expensive product to date. So, without further ado, let's break down this new flagship and see if it has what it takes to carry the company's banner going forward.

Build, fit, ergonomics:

Letshuoer's unboxing experiences rarely disappoint, and the Sonata is no exception. Like the Cadenza 12, the Sonata comes in a very nice, large case that can double as storage once the contents and foam inserts are removed. Inside, you'll find all the typical fare—tips, cable, carrying case—and also like the Cadenza 12 before it, the quality and experience of the unboxing itself are deserving of that flagship designation. Everything feels premium, intentional, and well-executed. The CNC-machined titanium alloy shells are very sturdy, and the raised faceplates feature a wealth of incremental detail. I'd say the shells are average in size and surprisingly comfortable despite their somewhat heavy weight. The nozzles are a bit large, measuring 6.8 mm at the widest point, where the slight lip helps hold tips in place. The shells also feature a vent located just in front of the flat 2-pin connection to help relieve any pressure issues. As I said earlier, the Sonata had another name prior to its retail release, but that's not where the changes end. While the prototype EJ10 opted for a colorful red faceplate design, the Sonata looks more like something you would see come out of the FlipEars school of design. According to Letshuoer, the faceplate design was inspired by ancient Greek culture and features a juxtaposition at its core. I'm paraphrasing here, but the lore essentially goes as follows: when war descends, the warrior protects the world and the goddess's silver strings heal the wounds, and both entities work in tandem to create a symphony of dissonance and harmony. The left IEM features an armor-clad warrior on a battlefield surrounded by swords and flames, while the right showcases a goddess in a flowing gown and laurel wreath headband, playing a harp in a peaceful forest. I'm certainly no ancient scholar, but as a layman, the theme makes perfect sense to me, and I think it's executed well from a design standpoint. Unfortunately, you don't really see this theme carried throughout the accessory package, and I feel like that's a missed opportunity. The cable is made of monocrystalline copper and silver-plated copper, and it comes with a 4.4mm termination. It also features very plain hardware and a simple black fabric sheathing that's somewhat microphonic. Honestly, I find it a little disappointing for a flagship IEM, but to its credit, it is malleable and doesn't tangle easily. I chose to substitute it with the Effect Audio Dionysus Reserve because a shell of this quality deserves a nicer cable. The large rectangular leather case also represents another small misstep. Don't get me wrong, the build quality is great, I quite like the green and gray colorway, and it even comes with its own Velcro dividers, but it doesn't really tie into the story Letshuoer is trying to tell. The size is a bit too big to be pocketable, and I'm not really sure what the card slots on the front are for. I've never thought of using my IEM case as a makeshift wallet, but maybe there's a market out there I'm not aware of. The Sonata also comes with nine pairs of tips in three different styles, including the TRI Clarion. I tried them all but settled on my own JVC Spiral Dot tips for the best fit and seal. Other accessories of note include dividers for the larger black case, a pouch for the IEMs, and a Velcro cable tie. Overall, I think the Sonata delivers a solid flagship experience. The titanium alloy shells feel very premium, the intricate faceplate design definitely catches the eye, and there is plenty to like here in terms of the unboxing experience and accessories. I would have liked to see a better cable, however, and more of the ancient Greek design elements carried throughout both the cable and case.

Sound impressions:

I would describe the Sonata as having a well-balanced U-shaped tuning with a deep and somewhat linear bass response, an accentuated upper midrange, and a smooth, slowly rolled-off treble. As far as drivability goes, the Sonata can reach high volumes with just a simple dongle, but EST drivers need ample power to reach their full potential. The note weight is adequate and nothing feels fleeting or ethereal, but I wouldn't mind just a touch more. The detail retrieval is great and there are plenty of nuances and subtleties to discover, but the Sonata also has a very nice sense of musicality that keeps the tuning from coming across as clinical or sterile. The soundstage is quite impressive with its almost concert hall-esque presentation, offering plenty of width, height, and depth. It's also aided by the imaging, which is impressively accurate in both distance and placement on the stage. The timbre is natural and strong, but I do pick up a hint of artificiality in some tracks, though it's very subtle. The Sonata's tuning doesn't really lend itself to a highly energetic and engaging presentation, but I do feel the dynamics as a whole are decent for the fine balance Letshuoer is striving for. The separation may also be lacking for some, but the layering and cohesiveness make up for it, at least for me. Overall, the Sonata executes a strong, flagship-worthy technical performance that sacrifices just a bit of separation and dynamism in favor of competence, maturity, and sophistication.

I'm at a point now where I have a really solid stable of sources, which includes the iFi GR2, Questyle Sigma, MuseHiFi M6 Double, and iBasso PB6. The first three are my main DAC/amps, and the last is a great standalone amplifier for when I want extra power or some extra tube flavor. With the Sonata, I spent a fair amount of time rotating between them in an attempt to find the best synergy. Starting with the Sigma, this little device is fantastic for bringing out the best in detail retrieval, separation, and extension on both ends of the frequency response, though it does veer a little leaner in note weight and slightly colder in tonality. Adding the PB6's tube mode to the chain brings an extra layer of dynamism and depth to the bass, but also a slight sharpness in the lower treble that I could do without. The M6 Double adds that little bit of warmth that I love, and the bass is bigger, bolder, and fuller. Unfortunately, the upper mids become a little too forward and throw off the Sonata's superb balance. The GR2 adds a nice sense of warmth, fluidity, and a slight coloration to the Sonata that's instantly addictive. It's a bit more energetic than the Sigma but with added note weight that helps keep it grounded. The GR2 cannot quite match the Sigma in terms of pure resolution and separation, but the trade-off for a more musical and enjoyable experience is definitely worth it to me. Plus, iFi's XBass comes in clutch when the basshead in me is yearning for more oomph. Adding the PB6 really elevates the entire experience to another level, but for the sake of simplicity in this review, I utilized only the GR2 with the bit-perfect filter to form my impressions.

●Lows - Firstly, I will say that the Sonata's low end is not as prominent as I expected based on impressions I've read of the EJ10. That could be because Letshuoer dialed it back a little for the commercially released Sonata, or maybe my affinity for bassy tunings has skewed my sense of balance to favor a bigger and bolder low-end response. Either way, the bass is strong and prominent, but it really only flexes its muscles when the track calls for it. For genres that don't make use of the full bass range, the Sonata still sounds quite balanced with just the right amount of punch, but for things like pop and EDM, it reaches low and rumbles with the best of them. It's more sub-bass focused with nice extension, and the linear-styled response isn't my usual preference, but the Sonata manages to pull it off really well. I do think it could benefit from a bit more mid-bass, but as it stands, the balance is very nice. The texture is clean but neither listless nor dry, and the impact and slam are satisfactory; however, if you're looking for a bass that'll punches hard, this isn't it. The speed is fast enough to distinguish double bass kicks, though not the fastest I've heard. The rumble and decay are also a touch on the quick side, and I wouldn't mind them lingering a bit longer, but the bass is well-separated from the midrange with no bleed issues. Overall, while the Sonata's bass is definitely north of neutral, I do find myself wanting just a hint more quantity and fullness at times. I wouldn't really call it a bassy all-rounder; instead, it's more like a well-balanced all-rounder with a tastefully elevated and mature bass response. That might be splitting hairs, but I do think there's a distinct difference between those two things. 

●Mids - Moving to the midrange, let us continue the discussion of how well-balanced the Sonata's tuning is. With a boosted bass response, you really need some emphasis in the upper mids to allow vocals a chance to shine, and that's exactly what Letshuoer has done. Despite the way it graphs, I don't perceive the midrange to be as forward as it appears. I think the Sonata gets the balance nearly perfect, and the deep and wide staging add a level of immersiveness that's easy to enjoy. There's also a great sense of naturalness here in the mids, and everything feels deliberate in the way it's presented. Female vocals do come across slightly more forward than their male counterparts, which I would argue throws the balance off just a hair; however, it's most apparent with upbeat pop and rock, with slower and less energetic genres faring better. The tonality feels perhaps just slightly north of neutral, leaning toward the warmer side. I actually wouldn't mind it veering even further in that direction, though that may just be my proclivity for warmth and heavier emotional weight. Still, the Sonata has enough of both to keep me engrossed in the music. The timbre isn't quite as natural and effortless as I would expect, but instruments fare a little better here than vocals. Referencing the graph once again, I was a bit apprehensive about the lower-midrange presence compared to the upper-mids, but I'm happy to report that instrumentation here is well-represented, coming across balanced, natural, and grounded, especially in orchestral arrangements. Overall, the Sonata's midrange is quite impressive. While it doesn't quite have that warmer tonality and smooth undertone I typically fall for, the level of detail, deep and wide stage, and sheer balance make for a very enjoyable experience. Nothing is really left up to chance in the way it's been tuned, and I think most listeners would find very little to complain about here.

●Highs - The treble is where the Sonata tends to show off more of those warrior-like characteristics incorporated into the design theme. I would describe it as energetic and engrossing with certain edge that the bass and midrange don't necessarily share. It's also a touch more aggressive here than in the other aspects of the tuning, and while I definitely wouldn't call it fatiguing, it's not too far off either. Of course, that depends on the listening volume and source pairing as well. I have definitely heard treble responses that pushed the envelope of my personal boundaries more, but the Sonata manages to strike a great balance of staying present and complementary without ever actually crossing that threshold. This is also where the Sonata gains its sense of edge and clarity due to a higher level of detail and a more delicate texture than that found in the rest of the frequency response. Cymbal crashes are splashy in just the right way, and snares pop with a quick attack and a certain flair for the dramatic, yet both still manage to sound quite natural. While I personally feel the Sonata's treble rolls off just right, some may take issue with the level of extension, especially those expecting a high-energy and airy EST presentation. There aren't any issues with sibilance, but the Sonata certainly won't disguise or smooth over any occurrences that are inherent to an individual track or recording. Now, some may say that's a bad thing, but others would argue that's exactly what a flagship IEM should deliver—an accurate portrayal of the music as it was mixed and mastered—and I would tend to agree. I do think those looking for an energetic and exciting treble presentation will find the Sonata more than up to the task, but more importantly for me is the way the ESTs don't exhibit some of the thinness and etherealness that can accompany this driver type. Overall, despite my usual propensity for a darker, calmer top end, I have to admit the Sonata's energetic presentation adds a lot to its well-balanced nature, and it just wouldn't have the same charismatic charm without it.

Comparisons: Credit to Audio Amigo for the graphs. 

● Letshuoer Cadenza 12 ($2000) - Obviously, we have to pit Letshuoer's new flagship IEM against the previous torchbearer. The driver configurations are quite different here, with the Sonata utilizing a 2DD, 4BA, 4EST tribrid design, while the Cadenza 12 is a 1DD, 11BA hybrid. Both sets have great accessories, which is not really surprising, but the Sonata's cable is infinitely more pliable than the super stiff one that comes with the Cadenza. However, for what it's worth, the Cadenza's cable is modular, and the case is much smaller and more pocketable. While both feature similarly sized and weighted titanium alloy shells, the shapes and designs are much different. I am not a huge fan of mirror-finished shells, as they tend to quickly accumulate scratches, so I much prefer the Sonata's aesthetic. Fit-wise, both are quite comfortable, but the Cadenza's more contoured shape is a little better for me. When it comes to sound, the tunings are quite different. The Sonata has a U-shaped tuning with added bass and upper-midrange emphasis, while the Cadenza has a much flatter response that is closer to warm neutral. The bass of the Cadenza is definitely deceptive, at least when looking at the graph; it has a much larger presence than you might think. Sure, the Sonata wins in sheer quantity, but the single DD in the Cadenza is a hard worker indeed, managing to convey a similar sense of low-end fullness and weight as its newest sibling. The Sonata, however, has deeper extension, more rumble and reverberation, and a slightly cleaner texture. While the Cadenza's bass is impressive, the midrange is where its tuning balance starts to lose some of its appeal for me. I typically enjoy a more vocal-forward presentation, which the Sonata does very well without taking it too far. The Cadenza's flatter tuning doesn't quite allow vocals to come as far forward or be as present as I would like. On the flip side, the lower midrange is better represented and more engaging, which really benefits orchestral music in particular. The Sonata also has a better sense of depth and some added heft to the upper mids that keep vocals grounded and natural. In the treble, the Sonata's presence and mid-treble regions are more prominent, translating to an energetic and engaging top end. There's a distinct sparkle, crispness, and edge in the Sonata that the Cadenza can't quite match, but the latter does have a certain incisiveness and a similar level of air and extension. I don't personally find either to be fatiguing, but the Sonata is the most likely candidate to cause issues for severely treble-sensitive listeners. When it comes to technical performance, these two compete well. The Sonata has a bigger and more expansive soundstage along with better dynamics, separation, and timbre, while the Cadenza leads in layering and note weight. But in all honesty, the performance gap here is very small. Ultimately, I think this matchup really comes down to individual tuning preferences. The Cadenza carried Letshuoer's flagship banner for a few years, and for good reason. It has great technicalities and well-balanced tuning in its own right, but I feel like the Sonata's sound signature just suits my preferences much better. The accentuated bass and upper mids help control the treble while simultaneously giving the Sonata a higher level of immersion and dynamism, all without losing technical performance. It's not as if the Cadenza is completely outclassed, though, and it still holds up well in today's market, particularly with classical and orchestral arrangements. It's simply a case of the Sonata being closer to my personal preference and speaking my language more fluently.

My pick: Sonata

● Virtus Audio Apex ($1300) - Here we have the 2DD, 4BA, 4EST tribrid configuration of the Sonata versus the dual DD of the Apex. From the price and driver configuration to the build quality and design, these two don't share a lot of similarities, but they are both pretty bassy boys when it comes to the tuning. The Sonata has a much better unboxing experience and higher-quality accessories, though the Apex does offer a more protective case option. The Sonata has a robust, durable metal shell and a very detailed faceplate, while the Apex's resin shell is simpler, smaller, and lighter. For what it's worth, Virtus does offer a multitude of faceplate designs for a small upcharge. Fit-wise, both sets are quite comfortable for me, but I think the Apex is slightly better. Moving on to the sound, as I said, both sets have a fairly prominent bass emphasis, but the Sonata is more U-shaped while the Apex is nearly L-shaped. Starting with the bass, there are some similarities, but the Apex is definitely the bolder of the two. Not only is the quantity greater, but the extension reaches lower, the rumble and reverberation are more prominent, and there's a better balance of sub- and mid-bass for my preferences. The Sonata is a little more sub-bass focused and has a cleaner, more detailed response. Both sets showcase nice speed and a slightly faster-than-average decay, but the Apex's impact and body give it an edge in my book. To put it plainly, the Apex has bass you feel, while the Sonata has bass you listen to. By this, I mean that the Apex is better for simply enjoying the music, while the Sonata's superior detail, texture, and separation are better for breaking down bass lines. The mids are where things really start to deviate. The Sonata has a more prominent upper midrange that pushes vocals and instruments to the forefront. The flagship-level separation and detail are again on full display here, and the smaller bass shelf means the entire midrange breaks through the bass more easily. However, the Apex brings a warmer tonality, more emotional expression, and a better sense of depth to the midrange that really pulls you into the music. I would say the Sonata has better accuracy and precision when it comes to instruments, but vocals on the Apex sound more fluid and natural, if not just a touch recessed. The treble responses are actually quite similar, but the Sonata's EST drivers do make an audible difference. The Apex comes across as slightly more energetic and sparkly, and the texture is a little bit edgy and rough. The Sonata, however, is buttery smooth with improved detail, air, extension, and overall balance, though the note weight is a little thinner. As for technical performance, the Sonata impresses with better detail retrieval, soundstage width, separation, timbre, and imaging, while the Apex has more note weight and improved layering, soundstage depth, and dynamics. Ultimately, I think this matchup really comes down to personal preference and what each listener values most. It's true that the Sonata outperforms the Apex from pure balance and technical standpoints, and the build quality and accessories are superior across the board. But for me, the Apex does so much right that it's really hard for me to put it down. Don't get me wrong, the Sonata sounds absolutely wonderful too, and its superb balance is key to its identity, but the Apex has exactly what I look for when I listen to my music library—a deep, bold, and visceral bass response, a warm and emotive midrange, and a smoother treble with just enough sparkle and clarity to keep things interesting.

My pick: Apex

● Thieaudio Monarch Mk IV ($1150) - Thanks to the Bay Audio Enclave Discord channel, I got a chance to review the Monarch MkIV and pit it against the Sonata. The Monarch also has a 10-driver tribrid configuration, but with two more BAs and two fewer ESTs. Both sets have nice accessories, including plenty of tips, but I prefer the Monarch's softer, more supple modular cable over the Sonata's somewhat plain, fabric-sheathed option. Both also have metal shells, but their build quality differs. The Monarch is crafted from lighter, aircraft-grade aluminum, whereas the Sonata is made of a sturdier, more premium titanium alloy. Design-wise, these two are pretty different. The Monarch actually comes with two faceplate options, both of which are colorful and eye-catching, but I think the intricately designed faceplates of the Sonata give it a higher-quality look and feel. The Monarch is the larger of the two and has a deeper insertion, which works well for me, though others may take issue with its size and fit. Moving on to the sound, the Monarch integrates a rumble switch on its shell that elevates the bass when engaged. For this comparison, I chose not to utilize the Monarch's rumble mode, as the graphs match more closely without it. Both have similar U- or V-shaped signatures, but the Monarch has a less pronounced lower-midrange tuck and upper-midrange accentuation, as well as more emphasis in the upper treble. Right away, I felt the bass was a bit deceptive. On paper, or on screen in this case, the Monarch looks to have more quantity, but in practice, the difference is pretty minimal. The Sonata's linear response offers better sub-bass extension, texture, and more natural-sounding decay. The Monarch's low end has more body, rumble, reverberation, and impact, but it also sounds a little bloated and unkempt, especially compared to the Sonata's flagship-level performance. This theme actually carries throughout the midrange too, where the Sonata's vocals come across smoother and more natural, with better depth and emotional weight. The Monarch offers a more vocal-forward midrange presentation with added excitement and dynamism. Vocals are generally better separated as well, which will definitely appeal to some, though they lean a little thin for me and lack the same level of depth. Instruments on the Sonata also have a certain sweetness that draws me in, which the Monarch cannot match. To my ears, the treble is where the greatest difference lies. The Sonata is overall smoother and better balanced with no hint of harshness or irritation, and the rolled-off response matches my preference quite well. The Monarch, on the other hand, has some issues. The treble as a whole sounds a little over-tuned, giving the Monarch more of a V-shaped signature. Cymbals are much more prevalent in the mix and come across as a little splashy and metallic, and certain vocal sounds like "s," "sh," and "t" can also be harsh, though it is quite tip-dependent. The Monarch does offer more crispness, extension, and air, however, for those who want them. Regarding technicalities, the Sonata wins in soundstage, detail retrieval, imaging, timbre, and note weight, while the Monarch has better dynamics and separation. For me, this really comes down to overall balance, refinement, and technical performance. Though they measure fairly closely on the graph, there are many distinct areas where the in-ear Sonata prevails. The bass is not only cleaner but also more refined, with better impact, texture, and weight. The midrange also has better dimensionality, and vocals sound more natural and mature. The treble, however, is the deciding factor in this contest, as the Sonata is much smoother and more agreeable while retaining a high level of detail and accuracy. Basically, it's a clean sweep for the Sonata, and even though it's nearly double the price, I think the value is worth the investment.

My pick: Sonata

● Kinera Mimisbrunnr ($800) - Shout-out to @jbfps116 for letting me borrow this one. I've had my eye on it for a while but didn't have an opportunity to try it at CanJam SoCal this year. The Mimisbrunnr sports a simpler 2DD, 2EST hybrid design compared to the Sonata's 2DD, 4BA, 4EST configuration. I didn't receive all the accessories for the Kinera, but I can say the cable feels a little cheaper and stiffer than the Sonata's, though I do like the hardware. The build quality and design are vastly different. The Sonata's heavier titanium alloy shells feel much more premium than the Mimisbrunnr's resin body and metal faceplate. Even though I love its "well of wisdom" design motif, the cheap feel only serves to undermine the awesome aesthetics. Also, it really bugs me how the stock cable's green color doesn't match the aqua blue of the shells. Sizewise, the Kinera is quite a bit larger, but the lighter weight and deeper insertion fit me a little better. Unfortunately, there's no comparison graph available as of yet, but when it comes to tuning, the Sonata is more U-shaped, while the Mimisbrunnr is more V- or W-shaped, thanks to increased emphasis of the upper midrange and treble. Starting with the bass, both sets have a somewhat linear response, though the Mimisbrunnr takes it a step further. The Sonata has more sub-bass emphasis and the mid-bass takes a tiny bit of a step back, while the Mimisbrunnr's mid-bass carries further, offering added impact and reverberation as well as a layer of warmth that I quite like. Unfortunately, the bass does tend to bleed a bit into the lower-midrange, and the speed, extension, texture, and resolution all fall behind the Sonata. The midrange tells a similar story. Mimisbrunnr has a certain flair for excitement in its vocal presentation as well as a surprising level of detail, but it lacks the nuance and maturity found in the Sonata's superb balance, timbre, and depth. There's also an audible echoey quality with the Mimisbrunnr that's a little off-putting, though vocals and instruments are pushed more forward in the mix for those who prefer it. The treble is where the Sonata really pulls away. The Mimisbrunnr's peakier response is again more exciting and engaging, but the Sonata's slowly rolled-off style sounds so much more balanced to my ear. Both have a similar level of air and extension, but the Sonata is smoother, and its texture and detail are on another level compared to the Mimisbrunnr's thinner and more energetic response. Also, snares and cymbals can sound somewhat distant and too far separated from the rest of the mix, and some vocal notes can be a bit harsh at higher volumes. Regarding technical performance, the Sonata has better imaging, layering, note weight, detail retrieval, timbre, and soundstage width, whereas the Mimisbrunnr performs well in separation and dynamics. For me, this one comes down to the tuning balance and technicalities. The Sonata makes a better all-rounder thanks to its high level of maturity and refinement, but despite being less flexible, the Mimisbrunnr still has an appeal all its own. The bold blanket of bass combined with the forward vocals is right in my wheelhouse, but the thin, peaky treble is where I take issue. The Sonata may not be as exciting or "interesting", but it has a tried-and-true tuning balance that works across any genre, making it an easy pick for me. Still, the Mímisbrunnr has a uniqueness that I'm drawn to, and I'd love to see Kinera further refine this tuning in a future project (but please include a better color-matching cable next time!).

My pick: Sonata

● Moondrop Variations ($600) - This is an interesting matchup as both sets feature similar tribrid driver configurations, just in different quantities. The Sonata contains ten total drivers (2DD, 4BA, and 4EST), while the Variations utilizes exactly half that number (1DD, 2BA, and 2EST). When it comes to unboxing and accessories, the flagship Sonata definitely takes the cake. It has more tip options, a nice large case, and a premium cable, but the Variations' inclusions are also decent, including a modular cable. The build quality is also a little different, with the Sonata being composed fully of metal while the Variations are a combination of a resin shell with a metal faceplate. The sizes are comparable, though the Sonata is a bit larger and the shapes are slightly different. The Variations have a semi-contoured design and a longer nozzle which fits me a bit better. Moving on to the sound, both sets graph fairly closely, but the Variations are a bit more V-shaped in nature due to the mid-bass tuck and extra upper-mid and treble emphasis. In the bass, the Variations delivers a deeper sub-bass extension, more impactful note delivery and weight, and a slightly slower decay with longer-lasting reverberation. The low end of the Variations is better separated from the midrange and takes much more of my immediate focus, while the Sonata has a more fluid and natural balance with the rest of the frequency response. The linear style response actually works really well here, and the extra mid-bass presence over the Variations really helps to bridge the gap between the bass and mids and add some fullness to the lower registers. The mids measure very similarly, but there are some key differences here as well, namely in the way vocals are presented. I wouldn't say the Variations are necessarily warm-sounding on their own, but they do tend to have more warmth and a more relaxed tonality than the Sonata. I would say they are smooth and almost intimate in the way they sit closer to the ear at the center of the soundstage. The Sonata's mids, on the other hand, are more energetic and diffuse, have a higher level of depth and detail, and are just slightly less prominent in the mix. Perhaps the simplest way to put it is that the Variations carry more emotional weight, while the Sonata has the clarity, precision, and timbre you expect from a flagship at this price point. The treble may actually be the most surprising part of the comparison for me. Even though these two share similar driver configurations and not-so-dissimilar graphs, they sound quite different. The Variations has more of a smoothed-over kind of feel, with snares sounding a bit blunted and cymbals slightly sterile or lacking excitement at times. The Sonata retains more of the crispness, energy, and detail that ESTs are known for, though the texture can border on brittle on some tracks. It also has slightly improved air and extension, but the rolled-off nature of both their tunings may not satisfy some. Lastly, we come to the battle of technicalities, where the Sonata basically wins in a clean sweep, particularly in timbre, dynamics, and soundstage, but the Variations manage to put up a fight when it comes to separation and layering. For me, this contest comes down to tuning balance and the specific use case. While the Variations has found a quick route to my heart after just a few months of ownership, it's hard to deny the Sonata's sheer balance and technical performance, which make it an excellent all-rounder. It really does present a fantastic tuning that's difficult to beat. Now, that's not to say I wouldn't still pick the Variations in certain situations, namely for those times I want more emotion and sub-bass extension, but again, the Sonata simply plays in a higher tier.

My pick: Sonata

● Hisenior Cano Cristales ($400) - This matchup features two IEMs that both have a total of ten drivers, but the Sonata is a tribrid consisting of 2DD, 4BA, and 4EST, whereas the Cristales sports a 2DD and 8BA configuration. Starting with the accessories, both sets have decent inclusions and plenty of tip options. The Cristales does have a modular cable, but the Sonata's is a little more pliable and premium-feeling. The Cristales' leather case is more pocketable, which I like, but again, the Sonata's case feels of slightly better quality. The shell sizes are fairly similar, but the builds and designs are in stark contrast. I much prefer the Sonata in both cases, as the titanium alloy offers better durability and the intricate design is very eye-catching. The Cristales shells have a traditional resin build, and while the vibrant purple colorway is fun, it's not my favorite. The fit, however, is quite comfortable thanks to the semi-custom contoured shape and deeper insertion. Moving on to the sound comparison, the Sonata is more U-shaped with linear bass and a smooth, slowly rolled-off treble, whereas the Cristales is more V-shaped with extra bass emphasis and a peakier treble that rolls off more steeply. The bass of these two is definitely different, but there are some shared characteristics as well. Both have decent sub-bass extension, plenty of rumble and reverberation, and solid impact and decay. Where they differ, however, is obviously in their quality and mid-bass presentations. The Sonata is leaps ahead in texture, detail, and separation, but the Cristales is more dynamic and arguably the more fun of the two. Unfortunately, it is a little too bloated, thick, and pillowy, which makes it hard to favor over the Sonata's mature and well-balanced flagship performance. In the midrange, these two are much more similar, but still not without their differences. Perhaps the most obvious aspect for me is the lower-midrange dip of the Cristales. While it helps to create a clear separation between bass and mids, it also makes the midrange tuning sound somewhat incomplete. The Sonata has a flatter lower midrange that helps lend more weight to instruments and create a more cohesive experience. It also clearly demonstrates how well-balanced the Sonata is across the frequency response. The Cristales, on the other hand, has a peakier upper midrange and lower treble that help isolate the boosted vocals, but they come across as distracting and artificial. And that leads us into the treble, where the trend continues. The Sonata is noticeably smoother and better behaved with a higher level of detail and better texture, whereas the Cristales' peakier response lends a little too much energy to snares and certain vocal notes. The Sonata also has a little more air and better extension, making it sound more whole. As for technical performance, the Sonata unsurprisingly comes away with a win in nearly every category, though the Cristales has a better sense of separation. For me, this matchup comes down to both the bass and treble responses, as well as the technicalities. It's silly to think the Cristales would hold up in sheer performance against the much more expensive Sonata, but it does have a few attributes some might favor. Notably, the bass is fuller and packs a thicker mid-bass presence, vocals are more isolated, and the accentuated upper-mids and treble are likely to appeal to fans of a more V-shaped tuning. However, I find the Sonata's bass to be of much better quality, and the smoother, airier treble makes for a more competent tuning. Honestly, the Sonata absolutely trounces the Cristales when it comes to cultivating a balanced, mature, cohesive, and versatile listening experience, not to mention the improved build quality and accessories, which make this flagship highly appealing.

My pick: Sonata

In conclusion:

If I've said it once, I'll say it thrice: balance, balance, balance. I know I've used that term quite a bit throughout this review, but it's hard not to when the Sonata is just so versatile and well-tuned. It's not every day that a company with Letshuoer's storied history debuts a new flagship IEM, and I truly think the Sonata is worthy of such a designation. While the Cadenza 12 has carried that banner since its 2023 debut and remains a fantastic option in terms of tuning and value in its own right, the Sonata manages to edge it out, at least for me and my preferences. The build quality of the titanium alloy shells is nothing short of fantastic, and I really like the gorgeous aesthetic. The faceplate design combines the drums of war with the sweet melody of peace, and this philosophy also carries throughout the sound. The Sonata has a dual sense of subtle aggression and sweet melodic flavor, as the tuning can be both intense and direct but also romantic and relaxing, though I think it leans a little more heavily toward the latter. One could argue that it needs a touch more intensity and dynamism to play up the warrior aspect, but I find it very pleasing and enjoyable—almost soothing, were it not for that bit of energy injected into the treble. There's a lot to love about the Sonata and very little to nitpick, and I use the term "nitpick" specifically because the few issues I have seem almost inconsequential once the music starts playing. The cable could be of higher quality and I would prefer a smaller case, but these are minor issues in the grand scheme. I would also appreciate a touch more note weight and a slightly warmer tonality, but overall, the Sonata has proven to be one of the absolute best that Letshuoer has ever created. From hard rock and metal to pop, folk, and instrumental music, the tuning is quite genre-friendly and pairs excellently with everything I threw at it. The Sonata was one of the most difficult IEMs I've ever had to score, and I think it deserves something closer to 4.8 stars, but in an effort to remain consistent with the half-step system, I had to round down in this case due to the issues outlined above. Still, this supremely well-balanced flagship takes its rightful place at the summit of Letshuoer's lineup, and I'm really curious to know what the company has in store next.