KIWI EARS Singolo

Review Of The Kiwi Ears X Crinacle Singolo ​

Introduction​

Kiwi Ears is a brand that has successfully established itself in the audiophile industry, receiving high accolades for its products and the value they provide. As I previously stated, with the exception of the original Orchestra, I have reviewed every single product that Kiwi Ears sells and they have never disappointed me in terms of sound quality. People already appreciate offerings like the Quintet and Cadenza for their favorable and balanced tuning. However, I believe they have delved further into different styled tunings to appeal to a broader range of audiophiles, which they accomplished well. Not only did they manufacture IEMs, but they also released the Allegro, a reasonably priced dongle dac that was well-received. They recently collaborated with Crinancle to create a one-of-a-kind release under $80 that employs a distinctive but not new method. The IEM is called as Singolo, and I was fortunate enough to receive a pair for review; but, before starting, I would like to clarify a few facts.

Disclaimer​

*Since this unit tour was organised by the kindly people at Linsoul, I am grateful to them. As I've said in all of my evaluations, the same is true for this one: all of the concepts I've expressed below are entirely my own, original ideas that haven't been influenced by anyone else. If interested, go to this link.
*I am not associated with the connection, and I receive no financial assistance from anyone.
*For the remainder of the review, I will refer to these IEMs as “Singolo.”
*I am using different Ear-tips for convenience and better versatility.
*Finally, I will only evaluate the Singolo based on their performance, even though I will explain how it feels and seems physically and aesthetically.

Specification​

The Singolo features a large 11mm custom Japan-made LCP dynamic driver on each side, and Kiwi Ears has implemented their new K.A.R.S technology, which appears to have introduced an elongated tubing structure for pressure release and airflow, with the understanding of Helmholtz resonance to regulate the tuning and manipulate the air pressure release to deliver the favourable bass response Kiwi Ears was achieving. The Shells are entirely manufactured of medical resin, specifically to apply their K.A.R.S technology and custom-built drivers. The shells are tiny and simple to slip into the ears, and the comfort is excellent even after extended listening sessions, however the nozzle adjustment may cause fit issues, as one of my friends experienced until he changed ear tips to ensure sufficient isolation. The bundled accessories are of lower quality than those offered by competing IEMs in this price range. As a result, I feel that the majority of the funding was spent on collaboration and IEM development. The accessories include a variety of eartips and a two-pin connection cable with an L-shaped 3.5mm termination plug. According to the technical specs, the impedance is 32 Ohms and the sensitivity is 108dB. The frequency response ranges from 20Hz to 20kHz.

Sound​

The Singolo's tuning tends toward a naturally warm tone that becomes increasingly pleasurable to listen to with each second. The bass response is optimized to sound larger, bodied, and genuine. Whatever I said, it wouldn't have mattered if the technology that the corporation was pleased to deliver to us wasn't effective. But, after giving it a good amount of time to understand and find logic, the only thing I was able to understand was that the driver used is of high quality, as is the use of the K.A.R.S technology, which is the implementation of acoustic tuning from the back of the driver to accentuate the air pressure, allowing for a dip around 200Hz-400Hz without affecting the natural tone that resides in that region. The whole response sounds genuine, lively, and right in every manner conceivable. The only issue I have is with the treble, yet it is what makes the Singolo sound great. Let's go further into the sound and learn more about it.

Treble​

To be honest, the Singolo's treble area lacks excitement and sparkle in the mix, but ample air and extension compensate for this, giving the treble region a solid presence. The response is also not the best in terms of note clarity or sharpness; however, the tuning tends to follow a natural and soothing response; personally, I don't like such a response dipping around 9kHz to 15kHz, subduing the tingling nuances and crispness of the notes, but it does make it sound more friendly and full-bodied while also keeping the listener engaged with a wholesome and natural sound. The upper treble extends sufficiently to provide enough air and space for the singers and instruments to breathe, making them seem open and alive. The lower treble, on the other hand, creates a pleasant interaction that the listener will find engaging. The lower treble contains enough energy to make the singers and instruments seem lively and upfront without being too hot or peaky, nor does it introduce any sibilance or tinniness. The notes have a more complete responsiveness and depth, sounding pleasing and melodic. As a result, the overall presentation of the treble range is soothing, natural, and enjoyable to listen to.

Mid Range​

In addition, the way the treble is adjusted harmonizes the bass and mid-range response balance, resulting in a clear and distinct response, if I were to examine the response as a whole. The mid-range enhances the voices and instruments enough to make them feel present and easy, while also providing a large sound with an open response. The treble and bass are adjusted in such a way that they never interfere with the midrange's clear and natural sound. The upper mid-range resonates with the lower treble, resulting in a more weighty and prominent response; the vocals, whether male or female, have a vivid and fuller response; and the instruments have a rich and rounded response with a distinct quality that enhances the vocals' presence, making the response musical and pleasant. I should also point out that the slightly shy response of roughly 1kHz to 3kHz region contributes to the spacious sound. The lower mid-range has a strong presence, allowing for good note weight and density, making the response sound thick and solid without becoming muddy or mumbly. Both the voices and the instruments sound rich and distinct, lending weight to top frequencies while compensating for the natural tone quality. Maybe the spike between 300 and 600Hz brings that warmth to the tones. As a result, the mid-range response sounds full-bodied, rich, and open.

Bass​

When it comes to bass, I have three key points to discuss: the technology employed, tuning, and the quality of the driver. Starting with the technology used, Kiwi Ears refers to it as K.A.R.S technology, which is the implementation of air pressure through elongated tubes to produce a more enhanced yet effortless bass response without interfering with any other region's natural quality of notes, essentially a cheat code that impresses me because no matter how many times I hear the Singolo, the region that is affected is not actually affected. The bass is tuned properly Harman, with sub-bass focus and enough mid-bass intensity to compensate. The sub-bass digs deep and hits hard, with plenty of rumble and power. The mid-bass has enough presence to make slams and thumps effective and engaging. Even if the notes aren't particularly precise, their number makes the response feel genuine and substantial. The rounded and weighted notes offer positive properties, allowing for a dynamic and engaging response. To be honest, I was skeptical at first and then perplexed since, while the response is packed with a powerful presence and each note conveys considerable differentiation without compromising integrity, it does not sound detailed or clear. I experimented with EQ and discovered that even when the sub-bass response was heavily emphasized, the driver did not distort or lose its composure. The best part is that even after heavily emphasizing the bass response, the mids remained completely clean and unaffected by the bass impact. This discovery finally led me to the conclusion that the driver utilized was of high quality and maybe wasn't intended to serve such a purpose. Overall, the bass area has a robust, forceful, and dense sound.

Technical Performance​

So when it comes to technical agility, I am afraid to say that Singolo is not a remarkable IEM, mostly audiophiles search for clarity and details around this price range and there are many IEMs around this saturated segment. Therefore I believe this pair produce a more tonally pleasing sound. However do not get me wrong, due to such saturation and spreading information across the globe doesn’t make it fair for me to say that Singolo suffices and has decent technical quality as I do find them on par with its peers. The areas where I find it interestingly different are the imaging, layering and separation. Let’s discuss in specifics.

Soundstage, Sound Imaging & Separation​

The stage is spread out enough to sound spacious and open, due to the fact that the response is spread out from more in the left and right side rather than front or back. The impressive part is the imaging which brings precision and clarity with great distinction between the notes which overall produces a very potent and strong sense of the presentation. The separation between the notes is accurate and allows me to effortlessly pinpoint where the sound is coming from.

Speed & Resolution​

Coming to the adequate resolution and details, the macro details are easy to surface yet the micro details suffer to come across. The attack and decay of the notes resolves at a natural pace which makes it sound more realistic even after not much refinement in the mix.

Sound Impressions ​

Sources​

Sony WM1A - While listening to the Singolo with WM1A, the response seemed more expansive, with stronger treble extension and less emphasis on bass presence in the mix, resulting in a more dynamic and large sound with hint of warmth. The female vocals were given more importance, while the instrumentation complemented them. The stage felt more equally distributed across the surrounds, making it sound more lively and expansive with correct note placement. The mid-range notes, however, sounded slightly thin and were presented lightly.



Tempotec V6 - While listening to the Singolo with V6, the midrange response seemed significantly accentuated, and the bass was well-controlled yet weighty. The treble was a tad hazy in presence but nonetheless thriving. The whole presentation conveyed an intimate, direct, and engaging tone.



Simgot DEW4X - While listening to the Singolo with DEW4X, the response appears cleaner and tonally leaner, while the notes sound closer, bringing the details and resolution to a higher level. The control over the vocals improves the overall tone of the response. The instruments also sound more engaged, with an overall open and energetic tone. Another component to consider is the treble, which sounds more polished and linear. Overall, the response sounds more lively and balanced in terms of detail, positioning, and staging.



Quloos MUB1 - While listening to Singolo with MUB1, The overall response had a distinct and resolved sound, with a significant focus in the mid-range area, which enhanced the voice impression and delivered a more clear, crisp, and transparent sound; the same can be said for the instruments, albeit the impact of the notes was not as powerful. The treble was more present, with finer details, yet the air and extension felt the same. In contrast, the bass seemed less lively in the mix, but it was accurate and well-controlled. The intricacies were easily revealed, but their effect lacked the brightness of the notes and their strong presence.

Tracks​

Millet - Anytime Anywhere
Anri - I can’t stop the loneliness
Kohana Lam - A Few Sentimental
Kohana Lam - Loving Me, Loving You
Uru - Kimino Shiawasewo
Uru - Kamihitoe
Kujira Yumemi - Kenka
Majiko - Kokoronashi
Anly - Sukinishinayo
Kohama Lam - A Few Sentimental
Kohana Lam - Loving Me, Loving You
Miliyah - Kono Yumega Samerumade
Rokudenashi - The Flame Of Love
Yu-Peng Chen - A New Day with Hope
Yu-Peng Chen - Another Hopeful Tomorrow
Yu-Peng Chen - For Riddles, for Wonders
Valentino Khan - Satellite
Kai Wachi - Happier By Now
Jawns - Erotica
ISOxo - how2fly
Kai Wachi - Happier By Now
Weeknd - Popular
YUNGBLUD - When We Die(Can We Still Get High)
Bring to Horizon - Kool-Aid
Middle Kids - Bend
FLETCHER - Leads Me On
Loathe - Aggressive Evolution
The Weeknd - Save Your Tears
Sigrid - Burning Bridges
AURORA - Black Water Lilies
AURORA - Runaway
X Ambassadors - Renegades
Lupe Fiasco - Words I Never Said
Macklemore & Ryan Lewis - Can’t Hold
Goyte - Somebody That I Used To Know
Jay-Z - Run This Town
Lady Gaga - Poker Face
Lady Gaga - Just Dance
Ladytron - Ghost
Travis - Love Will Come Through
LINKIN PARK - Somewhere I Belong
DJ Shadow - Six Days (Remix)
Hoobastank - The Reason
Ricky Martin - I Don’t Care
Tool - 7empest
Tool - Vicarious
A Flock Of Seagulls - Space Age Love Song
Zack Hemsey - Vengeance
Elton John - I’m Still Standing
The Moody Blues - Nights In White Satin
Micheal Sembello - Maniac
Guns N’ Roses - Sweet Child O’ Mine
A.R. Rahman - Kun Faya Kun

Conclusion​

To summarize this review, I believe Singolo is a uniquely introduced in-ear monitor that will appeal to a wide variety of audiences who can acquire it without hesitation to supplement their collection or for the first time test a really well tuned IEM from a highly complicated driver and its implementation. Singolo is a very well-tuned IEM based on a remarkable driver and genuine technology. Though I would stir away if I were searching for clarity and the details in this pair, I would still ask to give it a shot like I did. So, Kiwi Ears has once again earned my recommendation.

Having had the possibility to try so many different sets in a relatively short time I felt obliged to go ahead and express my gratitude by trying to help some lost souls out there, just as I was when I first stumbled upon this weird hobby about wired earphones – so yesteryear! … I thought. Possibilities are seemingly endless and only by getting to meet the right people did I manage to jump onboard the train heading the 'right' direction without getting off-track thousands of times along the way. Make sure to understand the helping person's preferences and you too can find your footing and hit the ground running in no time.


A Quick Intermezzo About Me

I won't bore you for too long with personal trivia, however my quick & short background resume goes as follows. Currently I am 27 years old and more in awe of sheer power of music by the day. I have always been moved by music just that slight bit more than average, I'd say. My spending started with a roughly 200€ Bose bluetooth speaker back in my first grade of highschool. What an extraterrestrial thing that was in early 2010s. And it keeps on playing to this day – a true testament of quality. Also sounded fantastic back then, nowadays … yeah, not so much. Lots of BT speakers, TWS, car audio speakers, IEMs, etc., later bring me to this day when I truly consider myself an audiophile. What brings me the most joy beside listening to music is singing, so I am currently participating in a choir and challenging myself with solo vocal covers (check the links in my signature to hear my projects). Unsure where all this leads, but the journey itself is marvelous and life is nothing but a journey.


How The Review is Structured

I will start off by mentioning the packaging and accessories, then place the showcased IEM in my special trademarked graph accompanied with other similarly priced IEMs I own and know well. Then I continue by giving it a score on certain qualities to help reach the final star score. Those that are seriously considering a single dynamic driver that is very affordable, please read the song examples below too to get as much of a feel on what one could expect. I really try my best to cover a wide variety to paint the sonic picture of the set for as many of you as possible.

I will mention some songs of varied genres and try to convey what one can expect from the Kiwi Ears Singolo. As sources I have been using my FiiO BTR7 on high gain and Venture Electronics RA2B-FE + Prime DAC. Certainly no lack of power and quite a different taste on both. Listening was done at a volume ranging between 80-90dB. I am using stock cable to keep it original in that regard and Divinus Velvet medium-sized eartips. I always review with fresh ears – no other IEM gets any ear-time while I am desperately collecting my thoughts regarding the reviewed item.

Disclaimer: I received this unit free of charge via Linsoul in exchange for a review. I am in no way incentivized to speak highly of this set. Should this review tip you over the edge and you decide on this IEM as your next purchase, I welcome you to check it out here: https://www.linsoul.com/products/kiwi-ears-x-crinacle-singolo


Packaging & Accessories






Packaging and accessories really won't tip anyone over the edge in their decision to purchase the Singolo. Having the cable already connected is a nice little touch to save you those awfully long seconds from unpacking to hearing the thing you purchased. Tips selection is very sparse and I honestly did not feel like trying them at all and went straight to the Divinus Velvet. Hearing all the bad experiences with how these fit I was skeptical. Lo and behold, they fit me absolutely wonderfully. It is a very shallow fit, but bass does not suffer, nor do I get any nasty treble peaks, but more on that in my song examples.



Let's Get Going!

Graph & Scores

This trademarked graph I came up with does not come with a thick user manual. All you need to know is that sets further left are warmer than sets further right, and sets higher up are better technically than sets lower down. Those little yellow lines on both axis represent where sets with average technicalities and neutral overall balance lay. I have also added three other single DD representatives - the Venture Electronics SIE, Simgot EA500 LM, and EPZ Q5 to help form a better perception of how the Singolo fares in comparison.



Here are my scores on the Singolo in individual categories. All three subcategories of each of the frequency spectrums can be rated 1-5. Keep in mind that I am scoring regardless of the price, so cheaper sets getting a 3 in any given subcategory is already good going. I had to approach this in a simplistic manner so to keep it easy to understand and compare sets. Since this is my third single DD I have reviewed, we are starting to get a good picture of how the scores are turning out.




7 Song Examples For the Curious

Song #1:
First minute of this song offers a quick sample to test piano, bass, trombone, and sax timbre as well as female vocals and the perception of stage.


Creep by Scott Bradlee's Postmodern Jukebox feat. Haley Reinhart

Song starts with a calming female vocal with lots of breathiness. On the Singolo vocally nothing stands out as a sore thumb, nor does it wow with highly articulated and deeply detailed presentation. Sibilance region is nicely adjusted so to still have that truthful bite that certain letters or combinations of letters carry. Often this 6-7kHz region backs off too much and while it does avoid sibilance it also messes timbrally with whichever instrument that extends up higher or has its overtones extending into that region. Well judged on the Singolo. Her voice is a bit smokier and not as rich as I know she can be on other sets which I would ultimately prefer, but that is just as much a matter of preference as 'correctness'. I would hazard a guess that is down to the rather quick drop-off right after the pinna gain peak. Going into »what the hell am I doing here« the open »heeeeere« can be too aggressive and rather uncomfrotable on some sets, but not so on Singolo. While it isn't as nuanced as it could be, it does not sound off in any serious way. Arrangement consists of various instruments, of which every single one requires timbral accuracy to maintain your attention. Singolo is very decent in this regard. What I find subpar however, is note weight through the mids and treble. Bass does not have the same issue and is a satisfying listen for both the bass and drums in this piece. Sincerity of bass is very good for this price category – it does sound decently rounded and does not affect low mids in any negative way despite decent extension in both subbass rumble and midbass attack. But more about bass on some other songs. Mids are where the set needs to shine to really bring this song the justice it deserves. The magic of mids is slightly lacking, but overall nicely judged in quantity, especially pinna instantly seemed to me to be done in a tasteful manner – graph sort of agrees in that it shows a very lengthy extension all the way from 900 to 3500Hz where it reaches a +9dB rise. Treble lacks in smoothness and any microscopic detail won't really be displayed here. Not too welcome in this tune with two brass instruments which should counter the strongly presented bass section. It feels a bit single-pointed just as the graph would seem to suggest as well – a large drop-off after 8kHz and a singular sharp peak at ~15kHz. This sort of treble tuning will be totally personal on whether your ears like it or feel awfully offended by it. A combination of hearing health, ear canal shape, fitment, and eartips all contribute to how this peak works out for an individual. Either way, expect to miss a good deal of details up top. Overall I have to say this song left me just a bit too cold for a very good score, so a 4.5/10 it is.

Song #2:
Angelic male vocal slowly transforming into a sharp male vocal and the usual rock accompaniment. Allows to better understand different sets' capability of perceived emotion, layering, timbre, etc.


Castaway Angels by Leprous

Guitar leads the way. I am very specific with guitars and love their breadth of ability to awaken a wide variety of emotions. Individual guitar plucks are not as storytelling as I would like, but it is timbrally right on. The slight lack of those sweet overtones is down to the slower pinna if I were to point at the culprit. Background hum that invokes a creepy atmosphere is easy to follow but a bit single-pointed. His vocal joins in a quiet and tranquil way to leave lots of space to develop afterwards. Male vocals are judged very well and the previously annoying smokiness I mentioned in the previous song's thoughts is not an issue here. Positioning of vocals is decently forward which allows for this sense of the vocalist being the leader while all instrumentation has sufficient space around him. In the wilder and more crowded spots of this song it becomes a tiny bit messy, but never sharp or overzealous. Here we do feel just a bit limited in the pace of the driver and the fact it is a solo performer with no BAs to take some weight off of its shoulders. Microdetail is not really a thing, but I cannot hold this against it. Overall tuning balance is of much greater importance. I would be reaching for another set for this song, however it is not a case of having to skip it, and hence a 6/10.


Song #3:
What a gorgeous tune to listen to … while testing bass texture, layering, soundstage characteristics, and restlessly dissecting each performer's work, like us audiophiles do. Tenor sax, trumpet, drums, piano, and bass all have something to say.


Check Point Charlie by David Chesky

Such a well produced jazz masterpiece with huge soundscape and very separated instrumentation that should never be in each other's way. It requires a great stage width especially, I feel. Singolo is very impressive in that regard, easily fooling my brain to ompletely dislocate the sound from the actual earpiece where it's born, obviously. Both left and right extremes do sound on the absolute extremities of head width and well beyond in certain instances – piano which plays on the far left side throughout the piece seems to be 5m away from me. Depth is not as well presented, but the generous width is what rectifies that to an extent. Individual instruments – bass, drums, piano, tenor sax, and trumpet are themselves, meaning no awful timbral incorrectness was found during my listen. Now, if I were to nitpick, and that's what us audiophiles are masters of, piano's note roundness and weight is not as sincere as I would ultimately like for it to sound even more real. Trumpet and sax have their sharper edges slightly rounded off too, so to not sound too piercing – carefully and intelligently approaching upper mid to low treble area while tuning is a good way of cutting harshness when tech at hand simply cannot reproduce the absolute clarity and note definition. I could honestly recommend Singolo to those who are this sort of jazz aficionados, it's a score of 8/10.

Song #4:
If this does not bring me close to tears on the set, the set is doing something wrong either in guitars, female vocals, or overall sonic balance.


All About You by Sophie Zelmani

Back to a deeply emotional guitar intro. Singolo is very nearly right on mark, alas it misses a bit of microdetail to really get my goosebumps going. Lower guitar notes are full and gorgeously rounded and cannot really be faulted. Those also wonderfully support her vocal which comes in with authority in that it is much more pronounced than the guitar both in positioning and volume. She has a story to tell and Singolo makes me listen, however soon thereafter I get pulled back to enjoying the well presented low end without any bloat and vocals are slightly put aside. This tune ought to bring us grown men close to tears or at the very least make our mind wander in trying to think who in our lives could be singing something as powerful to us at any point. Singolo does not possess the ultimate in capturing listener's attention to the fullest, thus a score that reflects the good presentation which falls short in emotion – 6/10.

Song #5:
Upbeat pop rhythms with plenty going on.


The thrill is gone. by RAYE

Careful high mids are a must in order not to overpower the lows which carry the rhythm and allow the treble to do the dance. Bass is very nicely driving the whole song along and I honestly don't feel like much is missing. It could, of course, be a bit more textured, but I cannot hold that against the Singolo at the price point. Main vocalist is well placed while I could ask for just a tad more drive or precision of all first note impacts just to make her story even more believable. Treble is nicely judged in quantity, however it is easily Singolo's least impressive part. Lacking in transient speed and that ethereal sweetness that better (and usually more expensive) single DDs, let alone BAs or ESTs, can deliver. I am thinking about something like the IE600 here and plenty others I'm sure, but I prefer to mention sets I have heard myself. The fact that it is well tuned in the upper frequencies is of much greater importance in this instance. This song often makes me want to listen to it again even after finishing putting my thoughts onto the keyboard, but in this case it just did not impress me enough. Still, a good score due to not finding anything bothersome, 7/10.

Song #6:
Oh, welcome crazy bass lines, please make yourselves comfortable along with tasteful drops and story-telling male vocals about an ill-intentioned lady.


Love is a B*tch by Two Feet

The width I have already praised before is very welcome in the intro of this tune as well, since it features a rainy cloud moving around in circles – forming two circles to be exact. The rain itself is lacking in the aforementioned detail retrieval to really get a sense of all those droplets hitting the ground, but that is secondary. His vocal and the bass drop are differently presented where his vocal is of this silky breathy quality whereas bass spares no heft and comes swinging all guns blazing. Low end extension is very well done thanks to the length of that tiny but effective tube, I would dare say. Male vocal is definitely nicer to my ears than female vocal on the Singolo – the slower pinna gain and quicker drop after pinna peak does not affect male vocals as much. Treble is again a bit of a weakness that lowers my overall score, but this song captures Singolo's character nicely overall, so I can bestow upon it a 8.5/10.

Song #7:
Definitely a competitor for best song title. It also gets the juices flowing and makes it impossible not to tap your feet. Or nod your head. Or both.


God is in the Soundwaves by Armin Van Buuren, Xoro, Yola Recoba

Lots of spacial cues right from the beginning which are handled well by Singolo as far as width is your first dimension you care about. Those clapping sounds are just a little veiled and not the most nuanced due to our slow pinna gain I would imagine. Her vocal is highly post-produced and feels that way on the Singolo which is good. Going into the drop bass has no trouble punching and rumbling and I think everyone but the most faithful bassheads will be happy here. Overall, this song is done well but suffers from one-dimensional soulless treble to really get me grooving. 7.5/10.

This concludes my song examples and hopefully you found some information that proves useful to your decision-making in the everlasting dilemma of To Buy or Not To Buy.



To Sum Up The Kiwi Ears Singolo

Singolo is the single DD for those that are on the search for a nicely balanced sub-100€ IEM which delivers a satisfying bass upon which other frequencies can dance. It is a nicely cohesive sounding pair which is usually a single DD strength. Male vocals are just a bit more correct than female vocals. Mid and treble detail are average, but no annoying peaks or dips mean a very nice casual listen. I would advise those with preference for natural, smooth and layered treble to audition before buying if possible. Same goes for the ones with shorter nozzles as their nemesis.

Thanks for reading and stay wonderful.

April. What are your associations with it? March cats licking their wounds from hormonal battles; taking advantage of this, birds start their polyphonic trills to the delight of melancholics and the sadness of insomniacs; leather jackets, sunglasses, first skirts and pretty high-heeled girls. It's spring! The air is saturated with the first freshness, still modestly piercing the thickness of receptors departing from the winter coma, everything around wakes up and begins to breathe in the rhythm of the city and nature. A great companion in such a time and mood can be seen in the heroes of our today's review - Kiwiears Singolo IEM.



Accessories

Our kiwi-birds are presented in a simple but nice cardboard package. Under the outer jacket we are met by a quality box, which contains a rather modest delivery set: the IEMs themselves, a thin 2-core cable made of silver-plated copper, two sets of eartips. To be honest, the cable and the eartips were put on the principle of “that'll do”. Of course they are not KZ-style, but not far from them, alas. The exterioк box makes much more impression than the set itself. You've met by your clothes, but it's too early to send you off...



Design, fit, usage

We are faced with very compact, comfortable in hands and ears earphones. And concerning the accessories, it's already a step forward. Pleasant shimmers of Fire-bird's tail on the dark faceplates - blue, blue, yellow, brown; transparent case for curious fidgeters; lightness, dimensions, quality of joints - all of the Singolo's kind. The design is calm, but you can get stuck on it, especially in the sunlight or other extrior lights. Or just explore the insides, clearly visible through the transparent shell.



The fit in the ears is excellent and unnoticeable, passive noise isolation is at 4.5 out of 5 even in the subway trains. And this is with barely formed anatomic shells, that's excellent and unusual! They fit perfectly!

The nozzle has a well marked edge, the eartips won't get lost, the diameter is medium, suitable for the use of most tips. Compensation hole is present at the outlet of the acoustic resonator housing. There is no vacuum effect, driver-flex or other unpleasant issues.

A special mention should be made for the 2pin connector of this paricular pair of the IEM: disconnecting cables in the left channel can be done only by Archimedes if there is a fulcrum, however, it is a matter of time, patience and strength. The audiophile must suffer (c).



But as it is easy to guess the most interesting thing is under this transparent hood and is not hidden from prying eyes and spring heightened consciousness.
The manufacturer proposed a new-fashioned scheme of 11 mm dynamic radiator with LCP diaphragm of its own tuning and Kiwi acoustic resonance system (KARS).

It's high time for wonders and discoveries, my tiny explorers:

KARS is not a gimmick – it is a discrete band-pass filter that manipulates airflow to the driver, regulating low frequency output. This patented innovation features an elaborate labyrinth tubing network that has been designed after numerous scientific and physical models to perfectly calculate the appropriate resonance point for the Singolo’s driver. KARS makes a tight sub-bass shelf possible; something that has been previously impossible in a single-driver IEM. The bass quality, quantity, and texture are all incomparable to any other tuning strategy used in a similar driver format.
Unlike traditional crossover networks that uses multiple drivers with RC (resistor-capacitor) networks, KARS instead uses Helmholtz resonance to regulate its tuning. Airflow to a dynamic driver regulates how much the diaphragm can respond, but also requires additional calculations of flow rate, direction, and volume. KARS allows exact regulation of this airflow to manipulate the sound as we desire. While capacitors and resistors provide a calculated means of crossover solutions, they also add unwanted artifacts to the sound in the form of distortion, especially when cheap SMD components are used.
With KARS, the sound you are hearing is directly from the driver itself, which translates into a pure and higher resolving audio experience without the hindrance of passive electrical components. KARS also eliminates the need for driver venting meshes, which has been traditionally used to regulate airflow into drivers. These meshes have low tolerances, causing unit-variances, as well as weak durability. KARS’ precise engineering eliminates this potential for imbalances and delivers a uniform sound in every unit.
The specific length, dimensions, and right-angled corners of KARS had to be scientifically calculated and tested to control the sub-bass shelf. KARS is precisely 3D-printed with a 1.0 micron precision. The labyrinth regulates airflow to the rear of the dynamic driver chamber, tightly controlling the back pressure to the diaphragm. This achieves two things simultaneously - it accurately regulates the sub-bass and bass response, and it also regulates pressure ventilation within your ear, which allows more comfortable and pressure-free listening. Finally, KARS allows a calculated removal of rear wave reflections from the driver, reducing wave cancellation and creating a higher quality sound.

Click to expand...

You know, just like another “Kiwi wins. Flawless victory". Let's see whether we face the "audiality" at the end of round two.....




Characteristics

Drivers - 11 mm dynamic LCP, KARS resonator system
Sensitivity - 108 dB/mW
Frequency range - 20 Hz - 20 kHz
Impedance - 32 ohms
Cable - 0.78 mm 2pin silver-plated copper, 2 conductors

Sound

Sources (3.5 mm output):

- Samsung Galaxy Note 9 (CS47L93);
- Abigail DAC (CX31993);
- Zishan DSD DAP (AK4495) mode;
- Kiwiears Allegro DAC (ES9028Q2M).

Tests were done with audiosense s400 and tri clarion eartips, with which Singolos showed an excellent level of sound, noise isolation and comfort. The IEM are not tight, despite the 32 Ohm impedance, with a player is naturally better at the edges of the range, for better disclosure is necessary to get at least a simple USB-C DAC, they sound without problems but even by a smartphone.

The sound profile was created in cooperation with a well-known representative of the audio reviewing community - Crinacle, which is reflected in the name of the model.



Bass

Singolos can be characterized by a decent elaboration of the lower range of the spectrum. Both the sub and mid-bass zones flow smoothly from each other, showing a decent level both quantitatively and qualitatively. The character is not bass-heady at all, but the sub has an excellent depth and delineation in moderate volume. Transition to the mid is merged, no rumbles and extraneous noises, bass guitar is fast, attacks and punch are characterized by a balance of detail and pressure. I'dlike specially note the lower bass, as it pleasantly tickles the eardrums, as for me - the classic dynamic presentation, that's we like it for!

Mids

The transition to the middle is seamless. The lower mid is of medium density, which allows you to get away from any turbidity in this area, without losing in solidity. The cellos seem to float in the air, the lowest registers of the instrument are moderately prescribed, there are as many of them as necessary, without excess or lack, with well-drawn overtones and layering. The contrabass won't take your breath away, just good. The violins are lively but not shouty, the pitch is natural and calm. Leading guitar growls, neither mean, nor Teddy-plush like a Labrador in a bull terrier mask.
Legs won't dance, that's not what iIEM are about. The vocal part of the spectrum can't be distinguished in any definite way with regadrding the performer's gender, it is also average, bright high female vocals will be a bit more intimate than in reality, while low male voices are presented with some lack of mass and energy. The placement of the vocals relative to the instruments is on the one level in the stage. The upper mids and sibilant zone is comfortable for extended listening and seems to be below average to my sensitive ear. No rubbing, whistling and other perverted fantasies of a misanthropic speech therapist. In general, the mids are not starry, but at the same time not sagging and not pushed back at all.

Highs

It's an interesting effect of the resonator's work, or just tuning of the classical DD, but the high frequencies pleased with their purity and clarity. You won't see lush tails here, everything is simple but clean, such a bright room with a cosmetic repair and a clean wide window lit by the spring sunshine. Drum attacks are clear, cymbals scatter in a pleasant rustle. On fast genres a slight muddiness and mushiness is possible. Relaxed character is more evident here, which does not spoil the general perception of upper frequencies and, in general, the whole musical canvas. The detailing is above average, I have no special complaints.

The subjective stage has a circular shape, with a parity in depth and width. A little euphoria from the separation of instruments is guaranteed. The pitch is smooth, safe, academic, with a hint of volume and air both between instruments and vocals, and in general when rendering the virtual stage. I don't know how to explain it, but you can clearly feel this layering between individual musical elements and images. Everything is smooth and good when analyzing private aspects of sound, without blockages and prevalence of any range, and in general there is an effect of presence and some kind of volumetric depth with division into echelons and this very “air”.

In summary

Singolo is an average iem by all means, but it surprisingly combines modest individual characteristics and particularities in a common merged and pleasant picture, not straining at long listening distances.



I would recommend it for classical, instrumental and medium vocal oriented music, light rock, jazz and funk; not for any extreme speed and overloaded styles. Although...listen to everything and relax, it will definitely work with Singolo!

I would like to express my gratitude to #Linsoul for providing the iem for the review!

Thanks for your attention! Stay tuned =)