Kiwi Ears Quartet
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https://www.linsoul.com
Product Features:
- Innovative double 10mm titanium diaphragms drivers, each independently driven by dual magnetic circuits, for extremely well extended sub-bass kicks.
- Harmonious Balance with a natural tonal balance, providing rich and thick bass without muddying the mids or treble.
- Custom Balanced Armature Drivers tuned to fit the Quartet's dynamic drivers for crisp and clean tone, detailed highs without shrillness or fatigue.
- Detachable High-quality oxygen-free silver-plated copper cable that is lightweight and allows noise-free audio transmission.
Model: Kiwi Ears Quartet
Drivers: 10mm Dynamic Drivers (x2), Custom Balanced Armatures (x2)
Frequency Response: 20Hz-20kHz
Sensitivity: 110db SPL/mW
Impedance: 32ohm
Earphone Material: Medical-grade resin
Cable Material: High-quality oxygen-free silver-plated copper cable
Connector: 0.78mm 2-pin
Cable Length: 1.2m ± 5%
Price: US$109.00
The package in Nicley decorated. inside is a large variety of tips a good cable and case.
The Quartet themselves are very rounded and are comfortable for long usage, I found the isolation excellent.
SOUND:
The Kiwi-Ears Quartet is a fun, warm sounding V-shaped IEM with a smooth detail and relaxed tuning that goes well with most music.
Bass: The lows on the Kiwi are prominent with the Mid-Bass just a little more so. Bass in general has good Texture, weight and speed. There is a little bleed into the lower mids.
It is sufficient enough to please most Bass loving audiophiles.
Mids: Present rich and thick with warmth and body. It has a slight rescission because of the typical V-shaped signature. Still Mids are full of character and smoothness. I found male vocals to be very pleasant.
Treble: Presents with a good amount of air and a smooth relaxed extension. I found it to b enjoyable for most types of music without any harshness. This is perfect for treble sensitive listeners.
Soundstage: Is accurate and natural in size, it handles some busy recordings well and while not the most technical in nature I think gaming should work well.
Afterthoughts: The KiwiEars Quartet is a well-made and comfortable IEM, it is not a detail monster but rather a super fun and relaxed IEM, I think it appeals to the casual listener for its enjoyable signature. It's like the bigger brother to the Cadenza but just more of the good stuff.
Kiwi Ears Quartet Review!
Good day! After 5 days of casual and critical listening, here’s my written review for the Kiwi Ears Quartet. Harmony in four!
Disclaimer:
- I don’t read FR graphs. I only use my ears, as how earphones should be used.
- Linsoul and Kiwi Ears sent this unit to me in an exchange for an honest, unbiased review. Rest assured that this review will do its best to devoid from any bias/es as much as possible.
- The following remarks and observations shall be made and owned only by me.
- No monetary compensation is/was involved before, during, and after the period of creation of this review.
- Your mileage may (and always, will) vary.
Burn-in time: 4-8 hours per day, 5 days.
Source/s used:
- -Hiby R3 Pro Saber
- -Fosi Audio DS1
- -Non-HiFi smartphone (Infinix Note 12 G96), PC.
- -Shanling UA1 Plus
- -Local Files via Foobar, YouTube Music, Deezer, and Qobuz with UAPP.
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Additional note here: I will be reviewing the Quartet on its stock configuration first (both switches are on the upper position) then compare it to the other switch configurations later on.
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Sound signature:
- The Kiwi Ears Quartet is a bassy, v-shaped sounding unit that leans to the warmer side of the spectrum. It can be a basshead’s delight and is configurable via its tuning switches.
Lows:
- Quartet’s game is its elevated, chunky bass. It is mainly midbass focused, with sufficient and deep subbass rumble to accompany with. Attack and decay are average and can sound sluggish at times, creating a “bloat” into the mids. Despite being a bassy IEM, it is nowhere near compared to the 7Hz Legato’s bass quantity, which may make or break a basshead’s dream. One thing is for sure though: The bass here on the quartet is very versatile and will cater most tracks used with it, in terms of quantity.
Mids:
- The mids are mildly recessed in this configuration, lush, and exhibit some amounts of midbass bleed. This of course translates to thicker, warmer characteristics in the aforementioned region. There are occasions wherein the vocals may sound a bit distant to my liking, particularly on my busy test tracks. Upper mids are definitely forward, with a good amount of definition, clarity, air, and sparkle. When used with the 01 config, peaks may be apparent on some tracks (more into that later). But for the most part, it is fatigue free to my ears during my tests. However, those ears that are sensitive to higher frequencies may look elsewhere aside from this IEM.
Highs:
- Moving on to the treble, it is a little bit elevated but not as elevated as the IEM’s lows. It is decently extended, airy, and fairly detailed. Most microdetails are audible enough on the Quartet, despite not being a “clinically-tuned” set.
Soundstage, Imaging, and separation:
- As for the technical performance, it is average in a nutshell, but could be better in this price point, in my humble opinion. The soundstage is average in terms of width, height, and depth, but never sounded and far from cramped or narrow. Separation is average and will get congested on very busy tracks. Imaging is precise to my liking and can render vocal and instrument positions clearly. It is also precise on most competitive games I used it with.
Tuning switch configurations! (1=up 0=down)
“00” config
- Everything sounds more “balanced” to my ears. Bass and Treble elevations are reduced by a bit. Some may even say that this sounds “relaxed” when personally heard. Mids are less recessed in this configuration. The rest are more or less the same.
- This configuration is my personal favorite as this tames down the bass by a bit and elevates the upper frequencies more, creating a “neutral-bright” sound signature. The bloat and midbass bleed is minimal and at times even gone during my tests, and the technicalities improved significantly. However, this configuration also introduces more upper frequency peaks in exchange for an airier and vocal-forward presentation.
- This sounds warmer compared to the rest of the configurations. Everything sounds more thicker and less airy when compared to the other frequencies.
Pros:
- - All rounder, bassy sound signature on all configurations.
- - Lush, smooth, overall sound quality.
- - Elevated, thick lows on all configurations
- - “Well-placed” mids most of the time.
- - Non-fatiguing upper frequencies.
- - Clear, detailed treble.
- - Average technical performance for its price.
- - Very good separation and detail (01 config).
- - Excellent fit, isolation, and comfort!
- - Smooth yet reliable build quality.
- - Visually pleasing aesthetic! (subjective)
- - Very good amount of accessories!
- - Easy to drive.
- - Versatile, intuitive tuning switches.
Cons:
- - Bass may sound “slow” and may lack texture on some configurations.
- - Vocals may sound distant in some configurations.
- - Upper frequency peaks are present on the 01 config.
- - Technicalities aren't competitive for its asking price (subjective).
- - Cable quality and aesthetic would’ve been better for its asking price (subjective)
- - Case is on the smaller side and will not fit all of the accessories and IEMs itself in one package.
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Verdict
Among all of the Kiwi Ears IEMs I’ve tried, the Quartet is by far the most “fun” and all rounder in terms of overall sound quality. Its bass, warm, engaging sound characteristic will definitely cater most genres and most ears paired with it. This may not be the first IEM to recommend to everyone, but it sure is one of my recommendations if you want a fun, bassy, versatile sound profiles.
Pairing recommendation/s:
- Source: This sounds just fine when plugged straight to a phone, but is vastly better when used with a proper source.
- Eartips: The eartips are alright and enough for the most part. You may always use your preferred eartips.
- Cable gets the job done, but quite lacks in visual and durability for its asking price, in my opinion. You may always use your preferred cable.
Non-affiliated product link here!: https://kiwiears.com/products/kiwi-ears-quartet
Additional Photos Here:
Kiwi Ears Quartet
2DD (Isobaric) + 2BA
$109
Before I start this review, first off, Thank you Linsoul for sending me the Kiwi Ears Quartet, rest assured, my review is 100% my own personal opinion.
You can get the Kiwi Ears Quartet from their website here : https://www.linsoul.com/products/kiwi-ears-quartet
Unboxing
Inside the Box You Get :
The IEM itself is made from medical grade resin, I believe that it is a hollow resin since the Quartet is practically weight nothing at all, It is beautifully made with care and my unit doesn't even have any bubble or imperfection on the body.
It also has a tuning switches that controls the upper mid area - treble
As for the cable, its pretty supple and light weight, it is functional 3.5mm stock cable, nothing special really.
Comfort is pretty good on this set, despite its large shell size
Sound :
Tested using : iFi Go Blu, Hidizs AP80 PRO-X, Stock Cable, Stock Eartips
Music is mostly from Apple Music Lossless and Offline FLAC Files
Genre : J-POP, J-Rock, Anisong, Rock, EDM, RAP, Jazz, Metal
Switches Configurations : ON - ON
Tonality in general, the Quartet is Bass Boosted Neutral and very musical.
Bass here is more focused on the mid-bass area, it has a pretty generous bass shelf, sounds authoritative, full, and dominant. It is certainly a bass centric IEM for sure.
Bass speed is not that speedy but not slow either, it still can be used for genre such as Metal but IMHO it is not ideal for double pedal.
The bass tuning is more suitable for genre like Rock, POP, RnB, RAP, EDM, Electronic, and Jazz.
Midrange is well tuned, it has a reference type midrange that can be controlled via tuning switches, the midrange is also free from mid-bass bleed.
The midrange here is certainly not the main star of the show, it is more like a complementary for the bass.
Vocal and Instrument is also rendered in a thick and lush presentation.
Treble on this set is smooth, not the most extended treble, musical, and again, it is not the main star of the show here.
Technicalities :
Stage for the price bracket of $109, is above average, shape is symmetrical in width and depth.
Imaging is "almost holographic" I'd like to describe the Imaging on the Quartet to be 2.5D, it certainly not only sound coming out from the IEM, but it is not on the "pop-up" type kind of sound either.
Separation - Positioning is also above average especially for a bass centric IEM.
I can easily separate what instruments and vocal and locate its position.
The Kiwi Ears Quartet stage - imaging - positioning - separation is also very good for gaming (tested on Valorant)
Detail Retrieval is decent, not the best bot certainly not bad either.
Comparation
Hidizs MS3
The MS3 is more tuned towards Harman Target albeit not true Harman.
MS3 presents sound in a more analytical way.
The bass presentation on MS3 is more leaner and has more punch rather than full bodied boom boom type bass if that make sense at all, hahaha !
Treble is also more sparkly on the MS3.
Technicalities is better on the MS3 thanks to its analytical type presentation.
Truthear Hexa
Cheaper than both MS3 and Quartet, It has more neutral with sub-bass boost type of sound, Hexa main focus is on the midrange and vocal, treble is also smooth on Hexa, technicalities is very close, though I must give the edge to Hexa due to its better treble definition.
Conclusion
Kiwi Ears Quartet is one of the well tuned bass centric IEM for sure, it presents sound in a very musical way that makes you want to nod your head without getting distracted by micro detailing and lots of micro informations.
If you like BASS and just want to enjoy and relax (or party?) to your music, the Quartet in my subjective opinion is very recommended
If you want the most detailed or technical prowess from an IEM, the Quartet might not be for you.
again, thank you Linsoul for sending me the Quartet for this review.
just in case you're Indonesian or understand Bahasa Indonesia, you can watch my video review of the Quartet below
that's all from me for now,
-littlenezt
2DD (Isobaric) + 2BA
$109
Before I start this review, first off, Thank you Linsoul for sending me the Kiwi Ears Quartet, rest assured, my review is 100% my own personal opinion.
You can get the Kiwi Ears Quartet from their website here : https://www.linsoul.com/products/kiwi-ears-quartet
Unboxing
Inside the Box You Get :
- IEM
- 3 Sets of Eartips
- Pin Switch
- Cable
- Manual
- Pouch
The IEM itself is made from medical grade resin, I believe that it is a hollow resin since the Quartet is practically weight nothing at all, It is beautifully made with care and my unit doesn't even have any bubble or imperfection on the body.
It also has a tuning switches that controls the upper mid area - treble
As for the cable, its pretty supple and light weight, it is functional 3.5mm stock cable, nothing special really.
Comfort is pretty good on this set, despite its large shell size
Sound :
Tested using : iFi Go Blu, Hidizs AP80 PRO-X, Stock Cable, Stock Eartips
Music is mostly from Apple Music Lossless and Offline FLAC Files
Genre : J-POP, J-Rock, Anisong, Rock, EDM, RAP, Jazz, Metal
Switches Configurations : ON - ON
Tonality in general, the Quartet is Bass Boosted Neutral and very musical.
Bass here is more focused on the mid-bass area, it has a pretty generous bass shelf, sounds authoritative, full, and dominant. It is certainly a bass centric IEM for sure.
Bass speed is not that speedy but not slow either, it still can be used for genre such as Metal but IMHO it is not ideal for double pedal.
The bass tuning is more suitable for genre like Rock, POP, RnB, RAP, EDM, Electronic, and Jazz.
Midrange is well tuned, it has a reference type midrange that can be controlled via tuning switches, the midrange is also free from mid-bass bleed.
The midrange here is certainly not the main star of the show, it is more like a complementary for the bass.
Vocal and Instrument is also rendered in a thick and lush presentation.
Treble on this set is smooth, not the most extended treble, musical, and again, it is not the main star of the show here.
Technicalities :
Stage for the price bracket of $109, is above average, shape is symmetrical in width and depth.
Imaging is "almost holographic" I'd like to describe the Imaging on the Quartet to be 2.5D, it certainly not only sound coming out from the IEM, but it is not on the "pop-up" type kind of sound either.
Separation - Positioning is also above average especially for a bass centric IEM.
I can easily separate what instruments and vocal and locate its position.
The Kiwi Ears Quartet stage - imaging - positioning - separation is also very good for gaming (tested on Valorant)
Detail Retrieval is decent, not the best bot certainly not bad either.
Comparation
Hidizs MS3
The MS3 is more tuned towards Harman Target albeit not true Harman.
MS3 presents sound in a more analytical way.
The bass presentation on MS3 is more leaner and has more punch rather than full bodied boom boom type bass if that make sense at all, hahaha !
Treble is also more sparkly on the MS3.
Technicalities is better on the MS3 thanks to its analytical type presentation.
Truthear Hexa
Cheaper than both MS3 and Quartet, It has more neutral with sub-bass boost type of sound, Hexa main focus is on the midrange and vocal, treble is also smooth on Hexa, technicalities is very close, though I must give the edge to Hexa due to its better treble definition.
Conclusion
Kiwi Ears Quartet is one of the well tuned bass centric IEM for sure, it presents sound in a very musical way that makes you want to nod your head without getting distracted by micro detailing and lots of micro informations.
If you like BASS and just want to enjoy and relax (or party?) to your music, the Quartet in my subjective opinion is very recommended
If you want the most detailed or technical prowess from an IEM, the Quartet might not be for you.
again, thank you Linsoul for sending me the Quartet for this review.
just in case you're Indonesian or understand Bahasa Indonesia, you can watch my video review of the Quartet below
that's all from me for now,
-littlenezt
TLDR version on YouTube: TDLR - Kiwi Ears Quartet
The Kiwi Ears Quartet have been sent to me by Linsoul in exchange for the publication of this review. As usual, Linsoul have not made any comments or requests and I will do my best to be as unbiased as humanly possible in this review.
You can find a (non-affiliate) link to the Quartet via Linsoul by visiting the version of this review posted on my blog.
To avoid being repetetive in my reviews, you can find all the info about how I create the reviews, equipment used, how I receive the products and how to interpret my reviews by visiting: About my reviews
Intro…
There have been a few Kiwi Ears releases lately, two models that I already reviewed and enjoyed. The Cadenza, with it’s single dynamic driver, being one of my top picks in the ultra-budget category, and the Orchestra Lite, an 8x BA config, which I also liked (although I didn’t find them such a “bang for buck” as the budget model). The Kiwi Ears Quintet is another interesting model (1DD + 2BA + 1 Planar + 1 PZT configuration) that will be coming soon but today’s focus is on the Quartet, a dual dynamic + dual BA set up, showing that Kiwi Ears have a configuration for everyone.
The Quartet is available for around 100€ (at the time of putting together this review) which places it midway between the budget Cadenza and the more expensive Orchestra Lite and Quintet options, meaning that they also have a price range for everyone.
I have spent a week or so with these IEMs, using them mostly at my desk while working, before sitting down to do my usual detailed listening with my test track list. I have to say that these have not disappointed me, keeping up the good vibes that I have been getting from Kiwi Ears lately.
Presentation…
The packaging and presentation of all the recent models from the brand is very similar, in fact, almost identical. On the outside of the box, only the model name and the image of the IEM is different.
Opening the box we also find the same contents as with the Orchestra Lite, which is to say the same contents as the Cadenza with only a storage/transport case in addition.
Said contents are the IEMs, the cable, 9 sets of tips in 3 types, a velcro cable tie, a small tool for the dip switches and the storage case with the Kiwi Ears logo.
I had absolutely no complaints with the contents of the previous models so I am not going to start now, they are of good quality and more than adequate to be able to pull out the IEMs and get straight into enjoying them.
Build and aesthetics…
While the aesthetics are similar throughout the models (except the Quintet, but thats for another day), with that marble swirl effect that I like, there are differences in the build. The overall shape of the Quartet is similar to the Orchestra Lite (almost identical) but has the marble swirl over the whole shell, not just the faceplate, and also features 2 dip switches on the back of the IEMs for changes to tuning.
The shape is comfortable, the IEMs are lightweight and I honestly have absolutely no complaints about the build or aesthetics of these IEMs. They are cheerful without being overly blatant and I find I can wear them for long periods without any discomfort.
The cable is simple but is well made and is also comfortable, without being overly thick (I am not one who really chooses overly thick cables on IEMs). It is not a boutique cable but it does its job and, again, I have no complaints.
Sound…
All tracks mentioned are clickable links that allow you to open the reference track in the streaming service of your choice (YouTube, Tidal, Qobuz, Spotify, etc.)
The Quartet features the 2 switches that I just mentioned and these give an option of 4 different tunings. Here is a graph of all 4 options together with my usual preference target as a reference:
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As you can see from the graph, there is not a huge difference but it is enough for each option to be distinguished from the others, something that can’t be said for some of the other “tunable” IEMs out there.
I honestly didn’t find any of the tunings horrible but I personally prefer the 0-1 tuning (that is first switch down, second switch up) as I find it tames the midbass a little and gives me a little more presence in the upper mids/lower treble. This gives the Quartet an overall presentation that I enjoy more than the others and, while on paper it may not seem to be anywhere near my usual preferences, I have found that it works well for most of my general listening throughout the day.
Starting off with the subbass, there is a nice presence and clarity in these lower notes, providing not only rumble but also definition. The “dirtiness” in the lower ranges of “Royals” by Lorde is easily appreciated, making for a deep reaching response that I like.
Moving into the mid bass, here the presence is noticeably boosted, giving more presence to these areas than I would personally pick, However, due to the clarity and the way the IEMs handles these notes, they are not overly bloated or muddy. “No Sanctuary Here” has plenty of presence but also good detail in these midbass ranges, working well for this track and a lot of electronic music in general.
With instrument based music, there is warmth in these lower ranges of guitars and basses which can become a little excessive on occasions. My usual fatigue test with “Crazy” doesn’t become overly boomy but is still more towards the boomy side of things than I would like personally. The upper ranges do a good job of counteracting this and the definition of the bass means that I don’t feel overly fatigued with the track, but I would still tame it down a little personally.
In general, while the bass is a little north of my preferences, the performance in these ranges does make up for it, making it quite an enjoyable listen. I did find that the other switch combinations increased the bass even more, which I would not choose personally but I can imagine there will be lots of people who will.
The mid range is slightly recessed to my ears, especially in the mid section but the upper mids do climb and bring back the presence of most vocals, especially female vocals in a lot of my acoustic music choices. I did find that, for example, Dr.Dre and Snoop Dogg in “Still D.R.E” seemed a little recessed in their vocals, which was exaggerated even more in other switch configurations, taking a bit of a step back in comparison to the lower ranges and the piano.
However, with something like “Don’t Start Now”, Dua Lipa is present enough and the clean and present bass makes for a great overall presentation. In the case of “Hallelujah”, I find that the female voice is more present than the male voice, but there is still a bit of a struggle for her to break through the bassy chorus vocals.
Moving into the upper ranges, there are a few peaks and dips that can sometimes interact in the wrong way with certain tracks and just in the right way with others. For example, I find that the voice of Zella Day in “Seven Nation Army” has a harshness to it that can make it less enjoyable, however, Paul Simon in “Diamonds on the Soles of her Shoes” is actually less harsh than I usually find it, making it more enjoyable (also, the Quartet do a great job or portraying the fretless bass in the track!).
I did find that other switch combinations could counteract the harshness of some of the tracks that suffer from it, but at the expense of more bass presence (which will be a good or bad thing depending on both your tastes in tuning and music).
Detail is very good in the lower ranges yet not so great in the upper ranges. I feel that there is a sensation of air and the slightly blunted treble region can add to the sensation that the detail is not quite there in the upper ranges.
Soundstage is pretty average, in the realm of IEMs, with image placement that is decent but not amazing. Tracks like “Bubbles” have a decent sensation of separation but not much in the way of space between them. With “La Luna”, I get a very similar sensation, that instruments are clearly separated between themselves but not very spread out, so you still get a sensation of the binaural recording but on a much closer level.
Conclusion…
I find that the Quartet can be a very enjoyable set of IEMs depending on what music you are listening to. There is the option of tweaking the tuning to your individual taste and it is nice that all the tunings are usable (again, depending on tastes), although I mainly opt for the 0-1 configuration. With instrumental electronic music, I find that they can perform very well and be very enjoyable. Even with acoustic instruments, the result can be good, although a little overpowering in the midbass for me personally. Where I find they are a bit of a let down is with vocals.
To be honest, there are certain vocals that sound very good on the Quartet, but there are many that can either suffer from a little lack of presence (being overshadowed by the lower ranges of the music) or can become harsh when those upper range peaks hit just in the right (or rather, wrong) spot.
While these IEMs are not going to suit everyone (including me), they will work very well for certain genres of music and be a good fit for many.
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As with all of my reviews, this is also available in Spanish both on my blog (www.achoreviews.com) and on YouTube (www.achoreviews.com/youtube)
All FR measurements of IEMs can be viewed and compared on achoreviews.squig.link
All isolation measurements of IEMs can be found on achoreviews.squig.link/isolation
DISCLAIMER
I would like to thank Linsoul for providing this review unit. The Kiwi Ears Quartet can be gotten here (no affiliate links): https://www.linsoul.com/products/kiwi-ears-quartet
SPECIFICATIONS
ACCESSORIES
Other than the IEM, these are included:
- 9 pairs of silicone eartips (3 x variants of S/M/L)
- Carrying case
- Cable
While there are no foam tips included (understandably, foam might not synergize well with the darkish Quartet as it might overly tame the treble), there are 3 variants of silicone eartips included. Amongst these 3 types of tips, consumers should be able to find something to suit their needs, from a sonic, comfort, fit and isolation perspective - hence, do tiproll to see what suits your preferences.
The included stock cable - an oxygen-free silver-plated copper cable - is on the thinner side, though it is quite serviceable. There's a chin cinch to give added grip, though unfortunately, there's some microphonics present.
Kiwi Ears has added a semi-rigid carrying case, which can fit the IEM plus some additional accessories.
The rest of this review was done with the stock cable and stock white tips. No aftermarket accessories were used, so as not to add any confounders to the sound.
BUILD/COMFORT
Each earpiece is individually hand-made from dermatologically friendly medical-grade resin. The housings come in a gorgeous purple hue with Kiwi Ear's logo emblazoned on them. From a build perspective, these are well made and pretty solid, with excellent aesthetics.
The earpieces are very light, but are on the larger side, so perhaps those with smaller ears might face fitting or comfort issues potentially. I didn't find driver flex on my pair, but this is partially related to ear anatomy and type of eartips used, so YMMV.
Isolation is below average, though the Quartet is still usable outdoors.
TUNING SWITCHES
The Quartet features a unique 2 x 10 mm titanium diaphragm DDs + 2 x custom BAs. Its selling point is none other than the 2 tuning switches, that gives 4 different tuning options on-the-fly.
Sadly, there is no card-pin included in the accessories to flip the switches, so consumers might need to get one, or perhaps use a toothpick to manipulate the switches (they are too small for the fingers to flick). This is a puzzling exclusion, as the card-pins probably cost no more than a few cents each!
Anyway on to the tuning switches:
Graphs of the Kiwi Ears Quartet on various tuning switches. 8 kHz region is a coupler artefact peak.
With both switches down (Blue graph), the Quartet becomes a warm V-shaped set.
With both switches on (Orange graph), the Quartet gets a L-shaped tonality, with a generous bass boost and a tamer upper mids/lower treble.
With switch 1 Up, and switch 2 Down (Green graph), it is quite similar to the Orange graph, just that this variant of tuning is smoother in the upper mids - indeed, this is probably the smoothest and least fatiguing of the tuning switches, and the Quartet take on a darkish tone. Resolution and technical chops are weakest on this setting, though it is the most laid back of the switches.
With switch 1 Down, and switch 2 Up (Red graph), the Quartet takes on a brighter balanced V-shaped signature. This is probably the most technical signature with best resolution - soundstage, technicalities etc are the best on this configuration.
In a nutshell, the switches do work, and ain't gimmicks unlike some other "tunable" CHIFI. This does give some variety in the sonics, and it is kind of getting 4 IEMs with 1 purchase, so versatility is one of the strong suits of the Quartet.
DRIVABILITY
I tested the Quartet with the following sources:
- Apple dongle
- Cayin RU7
- Colorfly CDA M1 DAC/AMP dongle
- Creative Sound Blaster X5
- E1DA DAC/AMP dongle
- Hiby R3 Pro Saber 2022 DAP
- Khadas Tone Board -> Schiit Asgard 3 amp
- Khadas Tone Board -> Topping L30 amp
- Questyle M15 DAC/AMP dongle
- Sony Walkman NW A-55 DAP (Walkman One WM1Z Plus v2 Mod)
- Sony Walkman NW A-55 DAP (Walkman One Neutral Mod)
- Sony Walkman NW WM1A DAP (Walkman One WM1Z Plus v2 Mod)
- Smartphone
The Quartet is relatively easy to drive, even weaker sources should be able to power this IEM adequately.
SOUND & TECHNICALITIES
The following impressions were done with the switch 1 Down and 2 Up position -> ie balanced V-shaped profile.
Timbral accuracy is very decent, there's just a tinge of BA timbre, and the Quartet definitely has better timbre than some other BA containing rival hybrids.
Technicalities are a mixed bag. Imaging is fine enough, with adequate positioning noted for instruments. However, the soundstage is intimate in all 3 dimensions and "in-your-head". Essentially, this translates to a compressed headspace and limited instrument separation, but there can be an argument made that some IEMs have a more expansive soundstage, though with a very fuzzy imaging. Micro-detailing is decent enough, though the Quartet is not one for critical listening.
The Quartet's bass on this configuration is mid-bass focused. Bass speed is fast and clean, with good texturing without much mid-bass bleed. Sub-bass extension is moderate with just a tickle to the low-end.
The lower midrange is depressed as per the V-shaped signature, but the lower mids are quite transparent as there isn't much mid-bass bleed encroaching here. The upper mids are well-dosed - being forwards without shoutiness, allowing vocals to be showcased well - that's a real tough line to balance, and the Quartet aces this area.
Considering this is the "brightest" tuning of the 4 signatures, the treble is still safe, with minimal sibilance. There's a lack of air and sparkle though, so trebleheads might find this area wanting. But on the flip-side, the Quartet is a great IEM for chilling back and relaxing to, due to the non-fatiguing signature.
COMPARISONS
Comparisons were made with other tunable IEMs around the $100 USD mark. As per the "SOUND & TECHNICALITIES" segment above, the Quartet was tested with the switch 1 Down and 2 Up position.
Toneking Ninetails
The Ninetails is a single DD IEM, named after an East Asian Fox Spirit, which can shapeshift and take on human appearances. The Ninetails actually lives up to its namesake, as there are tuning nozzles at the front and back of the housing to give 9 different sound signatures, from basshead to V-shaped to neutral. The Ninetails is more versatile as such, compared to the 4 tuning options of the Quartet.
The Ninetails has superior soundstage due to its open backed design, though imaging, micro-detailing and general resolution is noticeably better on the Quartet. Being a single-DD, the Ninetails has a more organic timbral accuracy for acoustic instruments.
The Ninetails is more ungainly to use, with an awkward gourd-shaped design.
TRI Starsea
The TRI Starsea is a 1 DD + 2 BA hybrid. It also has 4 tuning options, though the tuning switches give less of a difference in sound compared to the Quartet (the Starsea's tuning switches are borderline scammish).
With a 9.5 Ohm impedance, the Starsea is very finicky when it comes to source pairing, and it should ideally be paired with sources with an output impedance of <1 Ohm, otherwise the frequency response will be skewed. The Quartet is more source agnostic in contrast.
The Starsea has a quite apparent metallic timbre, though it has superior soundstage, micro-detailing and imaging. The Starsea however, is hotter on all tuning switches, with more sibilance and treble fatigue.
Additionally, there is driver flex and a suction sensation in the ears for the Starsea, unlike the Quartet, so comfort goes to the Quartet in my book.
CONCLUSIONS
The Kiwi Ears Quartet is a unique 2 DD + 2 BA hybrid, with excellent build and easy drivability. Its pièce de résistance is its versatility - the 4 tuning options do give sonically perceptible differences - from something L-shaped and bassy, to a more balanced V-shaped profile.
Across all the tuning options, the Quartet boasts a very non-fatiguing and laid-back sound, which makes it a good companion for chilling and relaxing to music. Timbre is also surprisingly decent, considering there are BAs inside the IEM.
Arguably, where the Quartet falls short is in technicalities - the soundstage is quite compact - and there are definitely hybrid competitors out there which do better in this department. Additionally, trebleheads and those that want an analytical signature best look elsewhere.
Otherwise, the Quartet does more things right than wrong, and one can consider that it is 4 IEMs in 1 purchase with the tuning switches. At the $100 USD price point, there aren't that many "tunable" IEMs out there, so the Quartet will have its niche, especially so with the sedate and calm tonality it brings to the table.
I would like to thank Linsoul for providing this review unit. The Kiwi Ears Quartet can be gotten here (no affiliate links): https://www.linsoul.com/products/kiwi-ears-quartet
SPECIFICATIONS
- Driver configuration: 2 x 10 mm titanium diaphragm dynamic driver + 2 x custom balanced armature drivers
- Impedance: 32 Ohms
- Frequency response: 20 Hz - 20 kHz
- Sensitivity: 110db APL/mW
- Cable: 2-pin, 0.78 mm, oxygen-free silver-plated copper cable
- Tested at $109 USD
ACCESSORIES
Other than the IEM, these are included:
- 9 pairs of silicone eartips (3 x variants of S/M/L)
- Carrying case
- Cable
While there are no foam tips included (understandably, foam might not synergize well with the darkish Quartet as it might overly tame the treble), there are 3 variants of silicone eartips included. Amongst these 3 types of tips, consumers should be able to find something to suit their needs, from a sonic, comfort, fit and isolation perspective - hence, do tiproll to see what suits your preferences.
The included stock cable - an oxygen-free silver-plated copper cable - is on the thinner side, though it is quite serviceable. There's a chin cinch to give added grip, though unfortunately, there's some microphonics present.
Kiwi Ears has added a semi-rigid carrying case, which can fit the IEM plus some additional accessories.
The rest of this review was done with the stock cable and stock white tips. No aftermarket accessories were used, so as not to add any confounders to the sound.
BUILD/COMFORT
Each earpiece is individually hand-made from dermatologically friendly medical-grade resin. The housings come in a gorgeous purple hue with Kiwi Ear's logo emblazoned on them. From a build perspective, these are well made and pretty solid, with excellent aesthetics.
The earpieces are very light, but are on the larger side, so perhaps those with smaller ears might face fitting or comfort issues potentially. I didn't find driver flex on my pair, but this is partially related to ear anatomy and type of eartips used, so YMMV.
Isolation is below average, though the Quartet is still usable outdoors.
TUNING SWITCHES
The Quartet features a unique 2 x 10 mm titanium diaphragm DDs + 2 x custom BAs. Its selling point is none other than the 2 tuning switches, that gives 4 different tuning options on-the-fly.
Sadly, there is no card-pin included in the accessories to flip the switches, so consumers might need to get one, or perhaps use a toothpick to manipulate the switches (they are too small for the fingers to flick). This is a puzzling exclusion, as the card-pins probably cost no more than a few cents each!
Anyway on to the tuning switches:
Graphs of the Kiwi Ears Quartet on various tuning switches. 8 kHz region is a coupler artefact peak.
With both switches down (Blue graph), the Quartet becomes a warm V-shaped set.
With both switches on (Orange graph), the Quartet gets a L-shaped tonality, with a generous bass boost and a tamer upper mids/lower treble.
With switch 1 Up, and switch 2 Down (Green graph), it is quite similar to the Orange graph, just that this variant of tuning is smoother in the upper mids - indeed, this is probably the smoothest and least fatiguing of the tuning switches, and the Quartet take on a darkish tone. Resolution and technical chops are weakest on this setting, though it is the most laid back of the switches.
With switch 1 Down, and switch 2 Up (Red graph), the Quartet takes on a brighter balanced V-shaped signature. This is probably the most technical signature with best resolution - soundstage, technicalities etc are the best on this configuration.
In a nutshell, the switches do work, and ain't gimmicks unlike some other "tunable" CHIFI. This does give some variety in the sonics, and it is kind of getting 4 IEMs with 1 purchase, so versatility is one of the strong suits of the Quartet.
DRIVABILITY
I tested the Quartet with the following sources:
- Apple dongle
- Cayin RU7
- Colorfly CDA M1 DAC/AMP dongle
- Creative Sound Blaster X5
- E1DA DAC/AMP dongle
- Hiby R3 Pro Saber 2022 DAP
- Khadas Tone Board -> Schiit Asgard 3 amp
- Khadas Tone Board -> Topping L30 amp
- Questyle M15 DAC/AMP dongle
- Sony Walkman NW A-55 DAP (Walkman One WM1Z Plus v2 Mod)
- Sony Walkman NW A-55 DAP (Walkman One Neutral Mod)
- Sony Walkman NW WM1A DAP (Walkman One WM1Z Plus v2 Mod)
- Smartphone
The Quartet is relatively easy to drive, even weaker sources should be able to power this IEM adequately.
SOUND & TECHNICALITIES
The following impressions were done with the switch 1 Down and 2 Up position -> ie balanced V-shaped profile.
Timbral accuracy is very decent, there's just a tinge of BA timbre, and the Quartet definitely has better timbre than some other BA containing rival hybrids.
Technicalities are a mixed bag. Imaging is fine enough, with adequate positioning noted for instruments. However, the soundstage is intimate in all 3 dimensions and "in-your-head". Essentially, this translates to a compressed headspace and limited instrument separation, but there can be an argument made that some IEMs have a more expansive soundstage, though with a very fuzzy imaging. Micro-detailing is decent enough, though the Quartet is not one for critical listening.
The Quartet's bass on this configuration is mid-bass focused. Bass speed is fast and clean, with good texturing without much mid-bass bleed. Sub-bass extension is moderate with just a tickle to the low-end.
The lower midrange is depressed as per the V-shaped signature, but the lower mids are quite transparent as there isn't much mid-bass bleed encroaching here. The upper mids are well-dosed - being forwards without shoutiness, allowing vocals to be showcased well - that's a real tough line to balance, and the Quartet aces this area.
Considering this is the "brightest" tuning of the 4 signatures, the treble is still safe, with minimal sibilance. There's a lack of air and sparkle though, so trebleheads might find this area wanting. But on the flip-side, the Quartet is a great IEM for chilling back and relaxing to, due to the non-fatiguing signature.
COMPARISONS
Comparisons were made with other tunable IEMs around the $100 USD mark. As per the "SOUND & TECHNICALITIES" segment above, the Quartet was tested with the switch 1 Down and 2 Up position.
Toneking Ninetails
The Ninetails is a single DD IEM, named after an East Asian Fox Spirit, which can shapeshift and take on human appearances. The Ninetails actually lives up to its namesake, as there are tuning nozzles at the front and back of the housing to give 9 different sound signatures, from basshead to V-shaped to neutral. The Ninetails is more versatile as such, compared to the 4 tuning options of the Quartet.
The Ninetails has superior soundstage due to its open backed design, though imaging, micro-detailing and general resolution is noticeably better on the Quartet. Being a single-DD, the Ninetails has a more organic timbral accuracy for acoustic instruments.
The Ninetails is more ungainly to use, with an awkward gourd-shaped design.
TRI Starsea
The TRI Starsea is a 1 DD + 2 BA hybrid. It also has 4 tuning options, though the tuning switches give less of a difference in sound compared to the Quartet (the Starsea's tuning switches are borderline scammish).
With a 9.5 Ohm impedance, the Starsea is very finicky when it comes to source pairing, and it should ideally be paired with sources with an output impedance of <1 Ohm, otherwise the frequency response will be skewed. The Quartet is more source agnostic in contrast.
The Starsea has a quite apparent metallic timbre, though it has superior soundstage, micro-detailing and imaging. The Starsea however, is hotter on all tuning switches, with more sibilance and treble fatigue.
Additionally, there is driver flex and a suction sensation in the ears for the Starsea, unlike the Quartet, so comfort goes to the Quartet in my book.
CONCLUSIONS
The Kiwi Ears Quartet is a unique 2 DD + 2 BA hybrid, with excellent build and easy drivability. Its pièce de résistance is its versatility - the 4 tuning options do give sonically perceptible differences - from something L-shaped and bassy, to a more balanced V-shaped profile.
Across all the tuning options, the Quartet boasts a very non-fatiguing and laid-back sound, which makes it a good companion for chilling and relaxing to music. Timbre is also surprisingly decent, considering there are BAs inside the IEM.
Arguably, where the Quartet falls short is in technicalities - the soundstage is quite compact - and there are definitely hybrid competitors out there which do better in this department. Additionally, trebleheads and those that want an analytical signature best look elsewhere.
Otherwise, the Quartet does more things right than wrong, and one can consider that it is 4 IEMs in 1 purchase with the tuning switches. At the $100 USD price point, there aren't that many "tunable" IEMs out there, so the Quartet will have its niche, especially so with the sedate and calm tonality it brings to the table.
This is my second product review for Kiwi Ears, I did a review on their first entry level one, the Cadenza. It seems that Kiwi Ears naming conventions are based on orchestral and musical ensembles.
This is Kiwi Ears Quartet, This is Kiwi Ears latest offering on their entry-level segment. It has hybrid driver set-up consisting of dual dynamic drivers in "isobaric" set-up and two balanced armature drivers. The 10mm dynamic drivers' diaphragms have titanium properties; either it is made of a wafer thin alloy or a spray-coated one which Kiwi Ears maintain that it will give a well-extended and rumbling sub bass which it also produces a stronger and thicker mid bass. The balanced armature drivers (probably a newer generation of Bellsing) gives cleaner, detail and crisper quality on midrange and high frequencies.
The drivers were encased in a light, medium-size medical-grade acrylic resin shells of UIEM mould that are quite versatile on fitting to all ear sizes. The shells have black colourway with some swirls of purple colour to make it more appealing and the face plate have. At the top of the cavity base shell, there are two tiny toggle switches to attenuate or enhance some sonic frequencies to give a different flavour to the tonality of The Quartet.
The fitting of this set is quite good and comfortable as it rests well into my lugholes without any issues even on long listening sessions as I don't experience any listening fatigue. It really has a good sealing as it is able to block some external noises from the outside surroundings.
For an entry-level set, it seems that Kiwi Ears Quartet has a decent product packaging with a quantifying amount of good quality inclusions inside. It has a tad larger than usual rectangular-shaped box for an IEM with a noteworthy design to give a lively vibe presentation.
Here are the following contents inside its packaging box:
■ A pair of Kiwi Ears Quartet IEMs
■ A black coloured twisted 4-core OFC silver-plated copper cable in 3.5mm termination plug.
■ Colour black, square shape zippered IEM case.
■ 3 pairs of black-coloured, narrow bore ear tips in different standard sizes.
■ 3 pairs of white-coloured, narrow bore ear tips in different standard sizes.
■ 3 pairs of translucent grey-coloured, narrow bore ear tips.
■ Instruction manual.
With low impedance requirement and high sensitivity rating, It seems that Kiwi Ears Quartet is an easy to drive set that most multimedia devices with normal gain amplification will be able to power it to its fullest performance.
Since that Kiwi Ears Quartet has toggle switches to change its tuning mode, it will have some emphasis in some part of its frequencies spectrum but it is still leaning towards a warm, U-shaped sound signature.
As for its toggle switches for tuning modes, here are the settings:
(* Legend: ○ = up , ● = down)
○○ - Midbass to low midrange emphasis, some elevation and flatten upper mids to presence frequency region.
●● - Similar to ○○ setting but it presents a bit leaner yet more "balanced" sounding (probably due to some lesser gain or resistance output?)
●○ - A more bass boost focus tuning, the upper-mids and presence treble frequency are a bit subdued as it sounds a bit dark sounding in my liking.
○● - It has a noticeable added gain on the upper-mids to presence frequency to give a hint of shimmer on it.
Here are my observations on the sound characteristics from each section of the frequency range spectrum of Kiwi Ears Quartet
LOWS/BASS:
This is the most prominent part of the frequency as it has an authoritative, good haptics and boomy. It gives more emphasis on mid bass rather than sub bass in which I actually prefer but too texture on it will have its caveats as it sound a bit bloated in my liking especially on the ●○* setting that affects the quality of the midrange and syphons the gleaming quality of treble.
It has a decent sub bass response as I discerningly hear a faint rumbling sound coming up from synthesisers, low tone bass guitar, octabass and drum machines. As I mentioned a while ago, it focuses more on the mid bass part as it is well-textured that it gives denser note weight on bass guitars, bass kick drums and bass-baritone vocals. It gives a darker and duller sound on bass guitars as it growls while a fuller and gloomy sound on bass drums, and then on bass-baritone vocals, it gives a darker, heftier and more sonorous voices on the likes of Barry White, Andrew Eldritch and Peter Steele of Type O Negative.
MIDRANGE:
The presentation on midrange frequency of this set is a bit recessed especially on some female vocals and rhythmic instruments but it has this lushness and insouciance that gives more texture and warmth.
The ●○* mode and to some extent, the ○○* mode setting gives more emphasis on low baritones and contraltos albeit it is a bit overdone in my opinion as it sounds too warm and too robust and chesty sounding on contraltos singers like Annie Lennox and Tracy Chapman. The ○●* and ●●* modes gives a more balanced presentation on baritones and contraltos then more natural approach with fairly presence on countertenors and mezzo-sopranos as it gives an angelic, smooth and velvety to give that captivating and very pleasant on my listening escapades to track some vocal qualities from Andreas Scholl, King Diamond of Mercyful fate, Andrea Corr and Stevie Nicks on her younger years on Fleetwood Mac. It is also noted that all tuning mode settings doesn't give me that satisfaction on what I prefer on tenors and soprano as it sounds less energetic, spicy and dazzling sound even the ○●* mode which supposedly added more bright but still not enough.
On instruments, strings like acoustic guitars gives off a warmer and buttery sound while on violins, it sounds austere and a tad muffled with it. Brass like trumpets and horns have full and rounded sound then a gravelly and darker on trombones especially on ○○* and ●○* modes. Woodwinds fares a bit better on ●○* ans ●●* modes as it gives mellow, rich and graceful on flutes while saxophones and clarinet sounds warmer yet it has melancholic and sombre characteristic on it. On percussive instruments, snares and toms have dark and muffled sounds on them, timpanis have dull and booming sounds on them. Then on pianos, they have a warmer, luscious and rich tone that usually found on some European antique pianos.
HIGHS/TREBLE:
The treble registers on Kiwi Ears Quartet are either balanced or dark sounding depending on tuning mode. ○○* has a decent energy but still dull and dead, ●●* and ○●* modes has a decent sparkle and smooth albeit a bit relaxed in my liking as my treble-head side says more energy and sparkle. And then on ●○* mode, this way too dark sounding and muffled as treble extension is almost non-existent. In general, Quartet's treble has its evenness in its presentation that it will not giveus a jarring sound nor sibilance.
Due to its smooth nature, it gives a dull and soughing sound on cymbals strikes while the hi-hats sound a bit warmer but its shortened sizzle still remains. The treble extension is rather paltry on this one as it has meagre sparkle with a subdued and suppress harmonics.
SOUNDSTAGE, IMAGING AND OTHER TECHNICALITIES:
Overall, the sound field dimensions of this set are rather average on width, depth and height. It is like I'm in a small pub on how I perceive it within my head room as it feels spatially confined.
Its imaging has a typical two-dimensional stereo presentation where I was able to estimate the location of instruments, vocals and other elements. Separation of instruments and vocals was decent enough but the layering capability is rather ill-defined and vague as both frequency and dynamic layering are poorly produce that it will struggle on complex tracks like orchestra, movie scores and jazz that has a multitude of well-arranged instruments or vocals.
The drivers inside have a good cohesion as it performs a decently fast transient response without any sort of distortion. Even though it seems the dynamic drivers are a bit slow and bloated, it wasn't that case after all as it was an intention of the tuner to sound like that.
It has a strong and solid fundamentals on resolving macro-dynamics but it has meagre performance in exhibiting and extracting micro-details as it sounds blunted and grainy. It appears to be that tonal colour of the Quartet is on an organic side but its unwarranted warmth on it makes it have a more analogue-ish vibe with it.
PEER COMPARISON:
GS AUDIO GD3B
◆ They are on the same price braket and also have a similar build and driver set-up though GD3B has lesser quantity in number of transducers but better on quality as its dual balanced armature drivers uses a more premium one which is SONION. It doesn't have any toggle switches to make it more complicated. The product packaging of GD3B is rather modest and bare bones to its asking price.
◆ GD3B has a balanced-neutral sound profile as it has a punchy bass to make it a bit more tidy compare to the Quartet, a neutral yet textured midrange and tad brighter treble response which makes it an overall more refined sounding compared to GD3B.
◆ On technicalities, GD3B is undoubtedly superior in all aspects from a wider sound/speaker stage, a concave imaging presentation, good separation and better layering. Even resolution capability GD3B is even more competent on detail retrieval.
CVJ MEI
◆ MEI has a solid aluminium alloy shell chassis and like Quartet it has toggle tuning switches and also of a hybrid driver set-up but lesser in quantity as it has only one single dynamic driver and 2 balanced armatures. MEI is a bit cheaper because it has some compromises on quantity amount of inclusions on
◆ MEI has a distinctive 4 tuning modes; a dark, warmer bass focus tuning, smooth U-shaped tuning, a bright V-shape tuning and a bright U-shaped. The smooth U-shaped tuning is the best one in my opinion on how it presents a more mature and refinement of its sound quality as it has clean basa response, a more neutral and vibrant midrange that gives an ample texture on vocals and instruments and a tad sparkling and smoother treble register.
◆ Even on technical aspects, CVJ MEI fare even better compared to Quartet from sound/speaker stage, better separation and layering and even better resolving on detail definition. Imaging and coherency performance are similar on both devices. The only thing that Quartet will win over MEI if the latter's tuning mode is on that single dynamic driver tuning mode which I consider it as a badly tuned one.
To put my conclusion regarding on Kiwi Ears Quartet. Kiwi Ears takes a different approach when it comes to tuning philosophy of this set compared to some of their products as they try to approach that fun, musical and engaging tonality over a high fidelity, very detailed and technically competent sound that Kiwi Ears is known for.
In my opinion, the Kiwi Ears Quartet is more of an experimental set as they try to garner more audio enthusiasts who want another tuning flavour on their listening experience. This set is definitely for listeners who only want an enjoyable and pleasant listening experience. This is a highly recommended one to casual type of listeners and novice audio enthusiasts out there.
Kiwi Ears Quartet is now available at LINSOUL, For those interested party who wants to purchase this product, just click the non-affiliated link below:
★★KIWI EARS QUARTET - LINSOUL★★
And also, check out my previous reviews of other Kiwi Ears products:
● Kiwi Ears Cadenza
SPECIFICATION:
MODEL: KIWI EARS QUARTET
IMPEDANCE: 32Ω
SENSITIVITY: 110dB
FREQUENCY RESPONSE: 20Hz – 20KHz
CABLE LENGTH: 1.2M
PIN TYPE: 2-PIN CONNECTOR (0.78MM)
PLUG TYPE: 3.5mm
DRIVER UNIT(S): (2) DYNAMIC DRIVERS + (2) BALANCED ARMATURE DRIVERS
Some Tracks Tested: ( * = 16-bit FLAC, ** = 24-bit FLAC, *'* = MQA, '*' = DSD, *'= .WAV)
Alison Krauss -When You Say Nothing At All *
Jade Wiedlin - Blue Kiss**
Led Zeppelin - When The Levee Breaks **
Mountain - Mississippi Queen *
Queen - Killer Queen **
Guns N' Roses - Patience *'*
Eric Clapton - Tears in Heaven '*'
Sergio Mendes- Never Gonna Let You Go '*'
Pearl Jam - Daughter **
Roselia - Hidamari Rhodonite *
Assassin - Fight (To Stop The Tyranny)*
Celtic Frost- Visual Aggression *
New Order - Blue Monday *
The Corrs- What Can I do (unplugged version) *
Jimi Hendrix Experience - Voodoo Child *
The Madness- Buggy Trousers *
Metallica - Motorbreath **
Mariah Carey- Always Be My Baby *
Destiny's Child - Say My Name *
Malice Mizer- Au Revoir *
Mozart - Lacrimosa *
New York Philharmonic Orchestra - Dvorak- Symphony 9 " From the New World." *
Eva Cassidy - Fields of Gold (Sting cover)*
Michael Jackson - Give In To Me *
Exciter - Violence and Force *
Diana Krall - Stop This World **
Debbie Gibson - Foolish Beat *'*
The Sisters of Mercy – Lucretia My Reflection**
Suzanne Vega – Luka **
Lauren Christy – Steep *
Ottoman Mehter - Hucum Marsi *
Diana Damrau - Mozart: Die Zauberflöte*
P.S.
I am not affiliated to KIWI EARS nor receive monetary incentives and financial gains as they provide me a review unit for an exchange of factual and sincere feedback from yours truly.
Once again, I would like to send my gratitude to LINSOUL especially to MS. KAREENA TANG for providing this review unit. I truly appreciate their generosity and trust towards me and other reviewers.
𝐊𝐢𝐰𝐢𝐄𝐚𝐫𝐬 𝐐𝐮𝐚𝐫𝐭𝐞𝐭 𝐑𝐞𝐯𝐢𝐞𝐰: 𝐀 𝐩𝐚𝐢𝐫 𝐨𝐟 𝟐𝐬
|| 𝗜𝗻𝘁𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 ||
Kiwi Ears as a brand has been really active recently with consistent releases in various price points from their budget-friendly Cadenza and the Orchestra Lite. Now KiwiEars is here once again with their brand new Quartet.
Sporting a 2 BA + 2 DD driver configuration, medical grade resin build and tunable switches, all for the $109. KiwiEars aims to win over the ever so competitive $100 price range with this new release, and we’re here to see if that is indeed the case.
|| 𝗗𝗶𝘀𝗰𝗹𝗮𝗶𝗺𝗲𝗿𝘀 ||
I don’t fancy confusing lingo, therefore, the reviews will simple without too much confusing terminologies
This set is sent in exchange for an honest review. There is no material or financial incentive for me to do this review and I guarantee no exchange has been done by both parties to influence or sway our opinions on this product.
My thoughts and opinions are of my own. My experience will entirely differ from everybody else. The contents of this review should not be considered factual as this hobby heavily leans on subjectivity. YMMV.
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𝗛𝘂𝗴𝗲 𝘁𝗵𝗮𝗻𝗸𝘀 𝘁𝗼 Linsoul Audio 𝗳𝗼𝗿 𝘀𝗲𝗻𝗱𝗶𝗻𝗴 𝘁𝗵𝗲𝘀𝗲 𝗼𝘂𝘁 𝗳𝗼𝗿 𝗮 𝗿𝗲𝘃𝗶𝗲𝘄. 𝗜 𝗱𝗼 𝗻𝗼𝘁 𝗿𝗲𝗰𝗲𝗶𝘃𝗲 𝗮𝗻𝘆 𝗳𝗶𝗻𝗮𝗻𝗰𝗶𝗮𝗹 𝗯𝗲𝗻𝗲𝗳𝗶𝘁 𝗼𝗿 𝗱𝗼 𝗮𝗻𝘆 𝗺𝗼𝗻𝗲𝘁𝗮𝗿𝘆 𝗱𝗲𝗮𝗹 𝘁𝗵𝗮𝘁 𝗺𝗮𝘆 𝘀𝘄𝗮𝘆 𝗺𝘆 𝗼𝗽𝗶𝗻𝗶𝗼𝗻𝘀 𝗼𝐟 𝐭𝐡𝐞 𝘀𝗮𝗶𝗱 𝗽𝗿𝗼𝗱𝘂𝗰𝘁. 𝗔𝗹𝗹 𝘁𝗵𝗲 𝘁𝗵𝗶𝗻𝗴𝘀 𝘀𝗮𝗶𝗱 𝗵𝗲𝗿𝗲 𝗮𝗿𝗲 𝗼𝗳 𝗺𝘆 𝗼𝗽𝗶𝗻𝗶𝗼𝗻, 𝗮𝗻𝗱 𝗺𝘆 𝗼𝗽𝗶𝗻𝗶𝗼𝗻 𝗼𝗻𝗹𝘆. 𝗧𝗵𝗲𝘆 𝘄𝗼𝗻’𝘁 𝘀𝗲𝗲 𝘁𝗵𝗶𝘀 𝗿𝗲𝘃𝗶𝗲𝘄 𝗲𝗮𝗿𝗹𝗶𝗲𝗿 𝘁𝗵𝗮𝗻 𝘁𝗵𝗲 𝗽𝘂𝗯𝗹𝗶𝗰. 𝗣𝗹𝗲𝗮𝘀𝗲 𝗱𝗼 𝗰𝗵𝗲𝗰𝗸 𝗼𝘂𝘁 𝘁𝗵𝗲𝗶𝗿 𝘄𝗲𝗯𝘀𝗶𝘁𝗲 𝗳𝗼𝗿 𝗮𝘂𝗱𝗶𝗼 𝗴𝗲𝗮𝗿 𝘀𝘂𝗰𝗵 𝗮𝘀 𝘁𝗵𝗶𝘀 𝗼𝗻 𝘁𝗵𝗲𝗶𝗿 𝘄𝗲𝗯𝘀𝗶𝘁𝗲 at https://www.linsoul.com
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| 𝗣𝗮𝗰𝗸𝗮𝗴𝗶𝗻𝗴 |
The Quartet comes with the box that is very much in line with their packaging design philosophy with their other products with a more minimal box and an illustration of the earpieces in front. Additional information such as specifications are on both the side and back of the box if needed.
| 𝗨𝗻𝗯𝗼𝘅𝗶𝗻𝗴 & 𝗔𝗰𝗰𝗲𝘀𝘀𝗼𝗿𝗶𝗲𝘀 |
Very simple mechanism in opening the box with a simple sliding action. You are immediately greeted with the IEM earpieces encased in foam with logos and typography.
Underneath is the provided hard shell case and some paperwork. Inside the case is the provided cable and 3 sets of eartips.
Not as packed with goodies like other sets especially for the price, but the accessories included is more than enough to get you up and running.
𝗜𝘁𝗲𝗺 𝗕𝗿𝗲𝗮𝗸𝗱𝗼𝘄𝗻:
Paperwork
IEM earpieces
Hard shell case
4 core SPC straight 2-pin cable
3 sets of normal-bore eartips(S,M,L)
I just got to give KiwiEars praise for how consistent and amazing they are on the packaging of they're products even at differing price points.
| 𝗩𝗮𝗿𝗶𝗮𝗻𝘁, 𝗕𝘂𝗶𝗹𝗱, & 𝗗𝗿𝗶𝘃𝗲𝗿 𝗖𝗼𝗻𝗳𝗶𝗴𝘂𝗿𝗮𝘁𝗶𝗼𝗻 |
KiwiEars only has the Quartet in purple as of writing this review. Built with medical grade resin, the Quartet feels really nice in the hand without any rough edges albeit a bit too light, but still a great build nonetheless. It sports a pseudo-custom fit with some grooves and a mild wing.
A very small vent is located beside the 2-pin slot and a pair of switches is on the rear of the earpiece. The nozzle is made out of resin as well with 2 holes with no mesh or filter. It is a bit short or stubby in my opinion though.
The overall design is great with this purple color that is vibrant enough unlike the earlier Cadenza that is a tad too dark for the color to pop. It looks as if it’s nail polish that shines and sparkles when lit up in certain angles with a dope depth effect going on too.
Equipped with 2 titanium dynamic drivers in an isobaric alignment for the lows and a pair of custom balanced armature drivers for the remaining rest, the Quartet utilizes both driver types to their advantages along with the fact that it also has tunable switches. This is the first time I've tried an IEM of this configuration and it interests me as to what is the benefit of such a specific orientation and compositions of drivers.
| 𝗜𝘀𝗼𝗹𝗮𝘁𝗶𝗼𝗻 |
Being a pseudo-custom fit, it does isolate quite well, albeit a deeper insertion depth will probably be more beneficial. Outside noises are muffled out, good for passive noise cancellation but is still miles away from actual active noise canceling. I did use this during my commute and it did quite well blocking sounds of horns and what not.
| 𝗖𝗼𝗺𝗳𝗼𝗿𝘁 |
These fit snugly to my ear because of the fit but these do tend to create hotspots, as my ear doesn’t respond well with protrusion like wings for longer periods of time which requires me to remove them after a good few hours to relieve my ears. The occlusion effect is the same as others, not great and not bad either.
** 𝑻𝒆𝒔𝒕𝒆𝒅 𝒘𝒊𝒕𝒉 𝑴𝒐𝒐𝒏𝒅𝒓𝒐𝒑 𝑺𝒑𝒓𝒊𝒏𝒈 𝒕𝒊𝒑𝒔(𝑺𝒎𝒂𝒍𝒍) 𝒕𝒉𝒓𝒐𝒖𝒈𝒉 𝒕𝒉𝒆 𝒁𝒊𝒔𝒉𝒂𝒏 𝑼1 𝒂𝒏𝒅 𝑽𝑬 𝑨𝒗𝒂𝒏𝒊 𝒅𝒐𝒏𝒈𝒍𝒆 𝑫𝑨𝑪**
|| 𝗦𝗼𝘂𝗻𝗱 ||
The Quartet has 2 switches that primarily change the treble and bass. I do find that the bass is what undergoes changes more when fiddling with the switches. This review will primarily be done with all the switches on/up, but a few references to other configurations will be stated.
I find the Quartet really fun and engaging to listen to without much fatigue. Timbre on this didn’t feel or sound weird in my opinion but I do think that tips (and maybe sources?) play a somewhat significant role on who this sounds.
| 𝗗𝗿𝗶𝘃𝗮𝗯𝗶𝗹𝗶𝘁𝘆 |
I did find myself pushing this more than most hybrid IEMs that I’ve tried, but not that power hungry than your standard planar. This can be easily ran off a dongle dac. I did find that I typically dislike using warm sources with these and will often pick a more neutral to bright sources to synergize this with.
| 𝗕𝗮𝘀𝘀 |
This is definitely one of the strong suits I noticed and adored the Quartet for. Bass is a bit more in the midbass than the rumbly subbass. Despite this fact, they do still have a certain amount of rumble to the playback. The bass is fast, bodied and and really well textured.
Note weight is quite great and doesn't feel lean but is affected by ear tip choice (I found that the Moondrop Spring tips actually tightens low frequencies)
| 𝗠𝗶𝗱𝘀 |
Mids proper is a bit recessed but doesn’t get drowned that much in the overall experience. Vocals are not per se, but they are “okay” is what I found them to be. They are still bodied and not lean but don't particularly excel in that regard, though sibilance is minimal, it is still present and is noticeable.
Upper mids however are great, instruments that go to this frequency are quite thick and textured without ever feeling or sound shouty. I feel the “pluck” of string instruments in my experience.
| 𝗛𝗶𝗴𝗵𝘀 |
Treble can be quite spicy especially in high volumes but is otherwise decent with good enough extension and details. They don’t particularly “sparkle” that much but I’m willing to take that over a really harsh treble.
| 𝗧𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹𝗶𝘁𝗶𝗲𝘀 |
Very run of the mill and average. Maybe because of the general tuning but technicalities are average. Imaging is okay but could be better, I can still pin point sources during playback albeit not as clean cut as other more brighter sets.
Staging is quite intimate and not as wide as I would have preferred. Layering is good though among all things, instruments doesn’t overstep in other fellow instruments and turn into a garbled mess. This is great for things such as gaming that benefits from good bass performance like RPGs and story-based games but maybe not so much for hyper-competitive FPS games.
|| 𝗖𝗼𝗻𝗰𝗹𝘂𝘀𝗶𝗼𝗻𝘀 ||
This is one of the very rare instances of upper midrange forwardness that I enjoyed without the caveat of being shouty. Despite it being quite bassy, which is one of the primary highlights of this product as per my observation and how they are marketed as, I do find the upper midrange to tread that fine line of between forwardness and shouty-ness which it executes with flying colors.
|| 𝗜𝗻𝘁𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 ||
Kiwi Ears as a brand has been really active recently with consistent releases in various price points from their budget-friendly Cadenza and the Orchestra Lite. Now KiwiEars is here once again with their brand new Quartet.
Sporting a 2 BA + 2 DD driver configuration, medical grade resin build and tunable switches, all for the $109. KiwiEars aims to win over the ever so competitive $100 price range with this new release, and we’re here to see if that is indeed the case.
|| 𝗗𝗶𝘀𝗰𝗹𝗮𝗶𝗺𝗲𝗿𝘀 ||
I don’t fancy confusing lingo, therefore, the reviews will simple without too much confusing terminologies
This set is sent in exchange for an honest review. There is no material or financial incentive for me to do this review and I guarantee no exchange has been done by both parties to influence or sway our opinions on this product.
My thoughts and opinions are of my own. My experience will entirely differ from everybody else. The contents of this review should not be considered factual as this hobby heavily leans on subjectivity. YMMV.
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𝗛𝘂𝗴𝗲 𝘁𝗵𝗮𝗻𝗸𝘀 𝘁𝗼 Linsoul Audio 𝗳𝗼𝗿 𝘀𝗲𝗻𝗱𝗶𝗻𝗴 𝘁𝗵𝗲𝘀𝗲 𝗼𝘂𝘁 𝗳𝗼𝗿 𝗮 𝗿𝗲𝘃𝗶𝗲𝘄. 𝗜 𝗱𝗼 𝗻𝗼𝘁 𝗿𝗲𝗰𝗲𝗶𝘃𝗲 𝗮𝗻𝘆 𝗳𝗶𝗻𝗮𝗻𝗰𝗶𝗮𝗹 𝗯𝗲𝗻𝗲𝗳𝗶𝘁 𝗼𝗿 𝗱𝗼 𝗮𝗻𝘆 𝗺𝗼𝗻𝗲𝘁𝗮𝗿𝘆 𝗱𝗲𝗮𝗹 𝘁𝗵𝗮𝘁 𝗺𝗮𝘆 𝘀𝘄𝗮𝘆 𝗺𝘆 𝗼𝗽𝗶𝗻𝗶𝗼𝗻𝘀 𝗼𝐟 𝐭𝐡𝐞 𝘀𝗮𝗶𝗱 𝗽𝗿𝗼𝗱𝘂𝗰𝘁. 𝗔𝗹𝗹 𝘁𝗵𝗲 𝘁𝗵𝗶𝗻𝗴𝘀 𝘀𝗮𝗶𝗱 𝗵𝗲𝗿𝗲 𝗮𝗿𝗲 𝗼𝗳 𝗺𝘆 𝗼𝗽𝗶𝗻𝗶𝗼𝗻, 𝗮𝗻𝗱 𝗺𝘆 𝗼𝗽𝗶𝗻𝗶𝗼𝗻 𝗼𝗻𝗹𝘆. 𝗧𝗵𝗲𝘆 𝘄𝗼𝗻’𝘁 𝘀𝗲𝗲 𝘁𝗵𝗶𝘀 𝗿𝗲𝘃𝗶𝗲𝘄 𝗲𝗮𝗿𝗹𝗶𝗲𝗿 𝘁𝗵𝗮𝗻 𝘁𝗵𝗲 𝗽𝘂𝗯𝗹𝗶𝗰. 𝗣𝗹𝗲𝗮𝘀𝗲 𝗱𝗼 𝗰𝗵𝗲𝗰𝗸 𝗼𝘂𝘁 𝘁𝗵𝗲𝗶𝗿 𝘄𝗲𝗯𝘀𝗶𝘁𝗲 𝗳𝗼𝗿 𝗮𝘂𝗱𝗶𝗼 𝗴𝗲𝗮𝗿 𝘀𝘂𝗰𝗵 𝗮𝘀 𝘁𝗵𝗶𝘀 𝗼𝗻 𝘁𝗵𝗲𝗶𝗿 𝘄𝗲𝗯𝘀𝗶𝘁𝗲 at https://www.linsoul.com
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| 𝗣𝗮𝗰𝗸𝗮𝗴𝗶𝗻𝗴 |
The Quartet comes with the box that is very much in line with their packaging design philosophy with their other products with a more minimal box and an illustration of the earpieces in front. Additional information such as specifications are on both the side and back of the box if needed.
| 𝗨𝗻𝗯𝗼𝘅𝗶𝗻𝗴 & 𝗔𝗰𝗰𝗲𝘀𝘀𝗼𝗿𝗶𝗲𝘀 |
Very simple mechanism in opening the box with a simple sliding action. You are immediately greeted with the IEM earpieces encased in foam with logos and typography.
Underneath is the provided hard shell case and some paperwork. Inside the case is the provided cable and 3 sets of eartips.
Not as packed with goodies like other sets especially for the price, but the accessories included is more than enough to get you up and running.
𝗜𝘁𝗲𝗺 𝗕𝗿𝗲𝗮𝗸𝗱𝗼𝘄𝗻:
Paperwork
IEM earpieces
Hard shell case
4 core SPC straight 2-pin cable
3 sets of normal-bore eartips(S,M,L)
I just got to give KiwiEars praise for how consistent and amazing they are on the packaging of they're products even at differing price points.
| 𝗩𝗮𝗿𝗶𝗮𝗻𝘁, 𝗕𝘂𝗶𝗹𝗱, & 𝗗𝗿𝗶𝘃𝗲𝗿 𝗖𝗼𝗻𝗳𝗶𝗴𝘂𝗿𝗮𝘁𝗶𝗼𝗻 |
KiwiEars only has the Quartet in purple as of writing this review. Built with medical grade resin, the Quartet feels really nice in the hand without any rough edges albeit a bit too light, but still a great build nonetheless. It sports a pseudo-custom fit with some grooves and a mild wing.
A very small vent is located beside the 2-pin slot and a pair of switches is on the rear of the earpiece. The nozzle is made out of resin as well with 2 holes with no mesh or filter. It is a bit short or stubby in my opinion though.
Equipped with 2 titanium dynamic drivers in an isobaric alignment for the lows and a pair of custom balanced armature drivers for the remaining rest, the Quartet utilizes both driver types to their advantages along with the fact that it also has tunable switches. This is the first time I've tried an IEM of this configuration and it interests me as to what is the benefit of such a specific orientation and compositions of drivers.
| 𝗜𝘀𝗼𝗹𝗮𝘁𝗶𝗼𝗻 |
Being a pseudo-custom fit, it does isolate quite well, albeit a deeper insertion depth will probably be more beneficial. Outside noises are muffled out, good for passive noise cancellation but is still miles away from actual active noise canceling. I did use this during my commute and it did quite well blocking sounds of horns and what not.
| 𝗖𝗼𝗺𝗳𝗼𝗿𝘁 |
These fit snugly to my ear because of the fit but these do tend to create hotspots, as my ear doesn’t respond well with protrusion like wings for longer periods of time which requires me to remove them after a good few hours to relieve my ears. The occlusion effect is the same as others, not great and not bad either.
** 𝑻𝒆𝒔𝒕𝒆𝒅 𝒘𝒊𝒕𝒉 𝑴𝒐𝒐𝒏𝒅𝒓𝒐𝒑 𝑺𝒑𝒓𝒊𝒏𝒈 𝒕𝒊𝒑𝒔(𝑺𝒎𝒂𝒍𝒍) 𝒕𝒉𝒓𝒐𝒖𝒈𝒉 𝒕𝒉𝒆 𝒁𝒊𝒔𝒉𝒂𝒏 𝑼1 𝒂𝒏𝒅 𝑽𝑬 𝑨𝒗𝒂𝒏𝒊 𝒅𝒐𝒏𝒈𝒍𝒆 𝑫𝑨𝑪**
|| 𝗦𝗼𝘂𝗻𝗱 ||
The Quartet has 2 switches that primarily change the treble and bass. I do find that the bass is what undergoes changes more when fiddling with the switches. This review will primarily be done with all the switches on/up, but a few references to other configurations will be stated.
I find the Quartet really fun and engaging to listen to without much fatigue. Timbre on this didn’t feel or sound weird in my opinion but I do think that tips (and maybe sources?) play a somewhat significant role on who this sounds.
| 𝗗𝗿𝗶𝘃𝗮𝗯𝗶𝗹𝗶𝘁𝘆 |
I did find myself pushing this more than most hybrid IEMs that I’ve tried, but not that power hungry than your standard planar. This can be easily ran off a dongle dac. I did find that I typically dislike using warm sources with these and will often pick a more neutral to bright sources to synergize this with.
| 𝗕𝗮𝘀𝘀 |
This is definitely one of the strong suits I noticed and adored the Quartet for. Bass is a bit more in the midbass than the rumbly subbass. Despite this fact, they do still have a certain amount of rumble to the playback. The bass is fast, bodied and and really well textured.
Note weight is quite great and doesn't feel lean but is affected by ear tip choice (I found that the Moondrop Spring tips actually tightens low frequencies)
| 𝗠𝗶𝗱𝘀 |
Mids proper is a bit recessed but doesn’t get drowned that much in the overall experience. Vocals are not per se, but they are “okay” is what I found them to be. They are still bodied and not lean but don't particularly excel in that regard, though sibilance is minimal, it is still present and is noticeable.
Upper mids however are great, instruments that go to this frequency are quite thick and textured without ever feeling or sound shouty. I feel the “pluck” of string instruments in my experience.
| 𝗛𝗶𝗴𝗵𝘀 |
Treble can be quite spicy especially in high volumes but is otherwise decent with good enough extension and details. They don’t particularly “sparkle” that much but I’m willing to take that over a really harsh treble.
| 𝗧𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹𝗶𝘁𝗶𝗲𝘀 |
Very run of the mill and average. Maybe because of the general tuning but technicalities are average. Imaging is okay but could be better, I can still pin point sources during playback albeit not as clean cut as other more brighter sets.
Staging is quite intimate and not as wide as I would have preferred. Layering is good though among all things, instruments doesn’t overstep in other fellow instruments and turn into a garbled mess. This is great for things such as gaming that benefits from good bass performance like RPGs and story-based games but maybe not so much for hyper-competitive FPS games.
|| 𝗖𝗼𝗻𝗰𝗹𝘂𝘀𝗶𝗼𝗻𝘀 ||
This is one of the very rare instances of upper midrange forwardness that I enjoyed without the caveat of being shouty. Despite it being quite bassy, which is one of the primary highlights of this product as per my observation and how they are marketed as, I do find the upper midrange to tread that fine line of between forwardness and shouty-ness which it executes with flying colors.
Review OF The Kiwi Ears Quartet
Introduction
Recently, Kiwi Ears has surprised me, particularly with the release of Orchestra Lite, one of the best contenders for IEMs under $300. The China-based company introduced its first IEM model, the Orchestra, in 2021. After that, they went dormant until the release of the Orchestra Lite, their second IEM model, which was well-received. I was smitten by their tuning and sound after just one listen. By introducing the Kiwi Ears Quartet, they have now also debuted in the IEM market for $150 and under. And today I'll be reviewing the Quartet, but first let's get a few things straight.
Disclaimer
*Since this unit tour was organised by the kindly people at Linsoul, I am grateful to them. And 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 "Quartet."
*I am using different Ear-tips for convenience and better versatility.
*Finally, I will only evaluate the Quartet based on their performance, even though I will explain how it feels and seems physically and aesthetically.
Specification
Four drivers, two balanced armatures and two dynamic drivers, make up the quartet's hybrid configuration. A custom mid-high frequency BA, an ultra-high tweeter BA, and two 10mm titanium dynamic drivers acting as subwoofers are all included in The Quartet. The dynamic drivers are both arranged in an isobaric pattern. The shells are extremely lightweight because they are made of medical-grade resin. The pattern on the Quartet shells, which covers the entire body and features their logo on the faceplate, looks absolutely stunning. The cable has a straight 3.5mm plug on one end and a detachable 2 pin connector on the other. The cable is a superior silver-plated, oxygen-free cable. The package includes everything that was also included with the Kiwi Ears Orchestra Lite, excluding the cable and IEM. Three different types of eartips in various sizes are included in the package, along with a carrying case. The sensitivity is 110dB, and the impedance is 32 Ohms, according to the technical specifications. The range of the frequency response is 20Hz to 20kHz.
Sound
This type of tuning for an IEM is unusual; to be more precise, the Quartet uses a balanced tuning but not quite in the way that one would expect a balanced tuning to sound like. I agreed that this is very differently tuned and sounds amazing after listening to it for a longer period of time than I typically give time to IEMs. I initially thought that this IEM had a very generic tuning and that there were better options for a charismatic experience, but the more you listen to it, the more you realise how well it is tuned to your preferences. This IEM really makes sense of using the tuning switches, especially where I find IEMs with tuning switches to be lacking. There are significant changes in two of the combinations, which makes the mid range forward or laidback. The intimate presentation of the sound makes it sound very revealing even though the presentation is not very broad and far. The treble appears expansive and crisp with no loss of detail, and the midrange can sound either forward or laidback depending on the settings you have made, which will be covered in more detail later in this review. The bass is prominent and has a significant amount of mixing power. Although I will go into detail in the treble, midrange, and bass sections, I will first review it with the stock configuration, which is both switches off.
Treble
Regarding the treble, it extends well but doesn't appear to sound particularly airy or light despite being active and detail-oriented with good exposure in the mix. primarily because the details are coming at you from every angle. It doesn't sound metallic or sharp, but the upper treble really brings out the details in the mix, giving the vocals a crisp, clean sound and giving instruments like the clarinet and cymbals a sparkly, vibrant sound. Both the vocals' nature and the nature of the instruments don't distort in the extension. While the vocals and instruments become playful without obstructing any of their spaces, the upper treble lacks an airy presentation and instead sounds filling. Even though the upper treble response is not smooth, it makes an effort to avoid sounding unbalanced, especially given the energy coming from the lower treble. Speaking of the lower treble, it has the same vibrant approach as the upper treble and sounds very energising. The instruments sound more detailed but don't come out as very fulfilling sounding, and I might also say the same for the male vocals as well. This is primarily because of the influence of bass in the mix, specifically how the bass is tuned. The vocals bring up more of their presence, especially female vocals. The presentation is still enjoyable to listen to despite the mastery of the notes that brings out the best in both the vocals and the instruments in the lower treble. IEMs like Dunu Kima and Salnotes Dioko sound more lively, expressive, and airy when compared to the Quartet, but they also sound more metallic and slightly offensive in response. The details either became very expressive and sound less airy or they sound very airy while losing out on higher frequency. Overall, the treble region is presented in a non-offensive, detail-oriented, and vivid manner.
Mid Range
Regarding the mid range When I first heard the forward presentation, I was taken aback because when I looked at the FR graph, it primarily represented a laid-back mid range. However, the more I dug into it, the more I understood. Therefore, despite what the graphs might suggest, the mid range is not suppressed or lax. This is caused by the tuning, which makes the bass more pronounced and the treble less prominent. The fact that the mid range is forward has significantly altered how I hear it. The upper mid range has the same amount of energy as the lower treble, but the instruments and vocals sound more dense and authentically reproduced. The instruments sound more rounded and complement the vocals along the mix while the vocals themselves have a nice forward presentation. The vocals are vivid and dense rather than overly energising, and the instruments sound clear and distinct with good note weight. Although the vocals have a good sense of space, they sound constrained and prevented from being open. The lower midrange has a rich, clear sound, and the note weight and density are ideal for adding warmth to the upper midrange. Both the vocals and the instruments have a clear response; neither sound is drowsy or unsteady. The bass guitar naturally sounds thick and organic. Both regions have incredibly rich and immersive musicality. The tuning is not generic, as I previously mentioned, and the midrange sounds different, but if someone is not satisfied with this response, changing the tuning will make a significant difference with the use of tuning switches. However, the sense of playfulness is still present here as well. The mid range of the Quartet is less open and expressive than IEMs like the Letshuoer Galileo or Dunu Kima, but it sounds much more authentic and tonally appropriate. The mid range region has a forward, clean, and natural sounding presentation overall.
Bass
The bass surprised me the most; naturally, after viewing the FR graph, I assumed that it would sound very bloated and oppressive, but I was terribly mistaken. The bass is very authoritative because it is well-controlled and has a powerful and noticeable presence. Even though the sub bass is highlighted, the mid range doesn't sound recessed. In the mix, the sub bass and mid bass levels have a similar energy and sound expressive. The sub bass extension has a great punchy presentation and goes down quite deep, giving off a soft sense of rumble in the ear canal. Compared to other IEMs in this price range, the notes sound clearer and better. The notes in the mid bass feel heavy and hit you hard; they have great thick slams and thump in the response. The bass is well controlled and quickly disappears from the mix, which is its best quality. Each component of this area effectively fulfils its function. Although it is undoubtedly not the cleanest bass, it sounds incredibly dynamic and detailed. With this much bass, the bass texture and details are fantastic. IEMs like the Kima and Galileo sound more controlled, detailed, and less overpowering in the mix. Perhaps because of this tuning approach in the bass range, the treble and midrange don't sound as open and airy. The use of the switches, however, does uplift or make the mid range prominent in the mix, which does help with the openness in the higher frequency. Overall, the bass region is presented in a strong, controlled, and authoritative manner.
Technical Performance
In terms of technical performance, the Quartet holds its own against IEMs in this price range. Although some people might either despise it or love it. Although the soundstage and layering are not as good as with other IEMs, this one sounds immersive thanks to its overall technical prowess. Let's discuss it in more detail now.
Soundstage, Sound Imaging & Separation
The depth perception of the stage is the least felt in the mix despite its good positioning, and it doesn't sound very far and wide. Although quite clear and sharp, the imaging could be even better. Every element feels far away and distinct enough to prevent them from messing up the mix, and there is a good sense of direction from where the sound is coming.
Speed & Resolution
At this price, the resolution is quite impressive because the details are easily accessible, the macro details are illuminating, and the micro details attempt to be as expressive as they can be. However, I believe the details from the Letshuoer Galileo were much better. Additionally, the notes' attack and decay have a rapid pace.
Sound Impressions
Tuning Switches
The midrange becomes more forward in the mix with the OI combination, whereas the other combination makes it less prominent in the mix, giving it variable stages for your preferences, when tuning switches are used for the first time. There is no point in talking about it because the technical performances were nearly identical in all of the combinations.
Combination IO
When using this combination, the response becomes less energetic in the midrange and treble and becomes more bass-heavy. The treble sounded nearly the same, and the mid range sounded less forward in the mix. Even so, I could still hear less treble in the mix. The bass had a punchier, thumpier sound. This pairing works best when listening to bass-heavy music.
Combination OI
This is the combination I prefer because it has a strong mid-range focus and less bass response. Although the response is almost like a standard combination paired with Hipdac, there is no offensive sound, the response is made more shimmery and sparkly with more prominent vocals and instruments thanks to the upper mid range and lower treble. The bass no longer conveys a sense of presence or influence. Preferable with all genres because it sounds fantastic with any track or genre.
Combination II
The response was the same after switching to this combination as it was with Combination IO, but the vocals in the midrange were better, with the male vocals sounding more pristine and approachable and the female vocals sounding more expressive. The upper range had the same sensation as the Combination IO. As the mid bass became more prominent, the bass felt more thumpy than punchy. Sounds best while listening to calming and enjoyable music.
Sources
Tempotec V6 - When used with the V6, the sound was more soothing and calming than with the other sources. The treble also sounded better, with clearer notes and less offensive characteristics. The mid range was forward and had a musical, organic sound. The bass had a strong, controlled sound. In the upper midrange and lower treble range, there is unmistakable sibilance. The only difference in the technical aspects was how much better the stage and separation felt with more effective open sound. I preferred the pairing most when it was with the V6.
iFi Hipdac - As the midrange was very active and forward in the mix, the pairing with the Hip Dac sounded more midrange focused. The treble sounded less extensive and more rounded, and the bass sounded a little less powered and less controlled. Since the vocals were so prominently featured in the mix, the openness in sound felt the best out of all the sources. Other technical aspects felt the same, with the exception of the stage, which seemed wider. Although the pairing with the Hipdac was excellent, I still believe that the V6 is probably more to my taste.
Megatron - The response was surprisingly clear and transparent when the Quartet and Megatron were combined, with more emphasis on the clarity in the treble region, where it sounded more expressive and detailed with cleaner response. While the bass sounded more textured, controlled, and refined, the mid range sounded the same but with more sharp notes. Sometimes the response at higher frequencies sounded a little offensive, and the timbre took on a more metallic quality. There were no discernible technical differences, other than that the resolution and imaging were clearer. For this IEM, the megatron pairing produced a more pleasing, vibrant, and clear sound. I enjoyed it.
Tracks Used
Luna Haruna - Glory days
Luna Haruna - Overfly
Rokudenashi - The Flame of Love
LMYK - 0 (zero)
ORESKABAND - Jitensya
Marina Horiuchi - Mizukagami no Sekai
RADWIMPS - Suzume
Indila - Love Story
Indila - Tourner dans le vide
Earth, Wind & Fire - September
Tom Petty - Free Fallin'
Fleetwood Mac - Everywhere
Nirvana - Smells Like Teen Spirit
Blue Oyester Cult - (Don't Fear) The Reaper
Guns 'N' Roses - Sweet Child O' Mine
The Police - Every Breath You Take
Gojira - Amazonia
TV on the radio - Wolf Like Me
Bring Me To The Horizon - Can You Feel My Heart
Bring Me To The Horizon - sTraNgeRs
Avril Lavigne - Dare To Love Me
Travis - Love Will Come Through
Gotye - Somebody That I Used To Know
DJ Shadows - Six Days (Remix) [feat. Mos Def]
Lady Gaga - Just Dance
Lil Wayne - Lollipop
Flo Rida - Low
Sebastian Lopez & Flug - Electronic Measures
Federico Mecozzi - Blue (Da Ba Dee)
Wayve - Not Enough
Kai Wachi & TeZATalks - Ghost
NGHTMRE, Zeds Dead & Tori Levett - Shady Intentions
Zeds Dead, DNMO & GG Magree - Save My Grave
Skrillex, Noisia, josh pan & Dylan Brady - Supersonic
Skrillex & Nai Barghouti - Xena
Skrillex, Missy Elliott & Mr. Oizo - RATATA
Kaifi Khalil, Eva B & Wahab Bugti - Kana Yaari
A.R. Rahman, Javed Ali & Mohit Chauhan - Kun Faya Kun
Conclusion
To sum up, I can say that the Quartet with tuning switches makes sense because every possible combination results in a unique signature. And even though one might disagree with what I have to say, standard tuning is safe and pleasant to hear. However, these are actually the first IEMs with tuning switches that actually function. I'm delighted to suggest an IEM that can carry multiple tunings to audiophiles who would love to own one.
K
kushgurjar8
Very well explained.
presleyp84
Amazing review. Great analysis.
Introduction
Kiwi Ears is a fairly new IEMS brand, although they already have a few models under their belt, some of which have already attracted the attention of reviewers and enthusiasts. The Cadenza model is a fairly inexpensive IEMS set that has received excellent reviews. The Orchestra model is an 8BA monitor, while its Lite sibling also has the same number of drivers, but costs about half as much. Finally, the model I am currently reviewing, called the Quartet, is a 2DD + 2BA, designed around a new dual-driver superbaric dynamic subwoofer. The diaphragm used is 10mm titanium, each driven independently by dual magnetic circuits. The pair of drivers is passively aligned to synchronise in phase to avoid sound wave cancellation. The dynamic drivers were crossed over by a passive low-pass network at 350 Hz to provide rich, thick bass, while the mids from 350Hz to 1 kHz were tuned to be completely flat. The Quartet features a custom BA for mid-high and a custom BA tweeter for ultra-high frequencies. These drivers were modified to match the balance of the new dynamic drivers with a ventilation system tuned to provide more airflow. In the Kiwi Ears tradition, the balanced armatures are passively adjusted to match our internal target curvature for the mids and highs. Another important aspect is that it has two mini-switches to set the sound in 4 different curves.
Well, practically all this information has been extracted from the web. But, after this introduction, I guess it will be more interesting to talk about other aspects and, above all, its sound, at least from my point of view.
Specifications
Packaging
The Kiwi Ears Quartet comes in a medium-sized, purple box, whose dimensions are 131x113x66mm. On the front side, a realistic photo of the capsules can be seen in the centre. A little higher, on the left, is the logo of the brand, on the right, the slogan. Below is the model name, all in white letters. On the back is the model name in very large white letters, logos of the certifications it complies with, as well as the brand's brand name. Interestingly, the address is in Ireland and Manchester, but they are manufactured in China.
After removing the decorated outer cardboard, you see a completely black box, with a silver logo in the centre of the box. Underneath are the capsules inside a layer of foam lined with black cardboard. The model name is on the left side, while the logo is on the right side. Underneath this layer is the case with the rest of the accessories, which is black and has the logo in white. In summary, the complete contents are as follows:
Each set of tips comes in an individual transparent zip pouch. The zippered case is a bit wider than usual, the problem is that it is a bit flat for the volume and size of the capsules. A few foam tips and some balanced cable termination are missing. But overall, the presentation is about average for the price.
Construction and Design
The Kiwi Ears Quartet are hand-made and hand-polished from medical grade resin. The shape is almost custom, with integral nozzles. The body is thick and the resin has a flowing purple and glitter pattern on a black base. The outer face has the gold logo on the inside. It is shaped like the African continent, although more stylised at the bottom edge. On the side are the two mini-switches, while the transparent piece that houses the 2Pin connection is integrated into the capsule and does not protrude. Nearby there is a small hole. The inner side has a protrusion on its edge, as an anchor. As I said, the nozzles are integral, there is no separation of any material and the flow pattern is continuous on them. They are not very long, it is difficult to measure their size as they are made in one piece. At their base, the oval diameter is 6mm maximum, while the rim is 6.6mm, with the same shape. The tip of the nozzle is not flat and has two generous holes, which are the channels through which the sound flows. The capsules are light, soft and smooth, pleasant to the touch and to the eye.
The cable consists of 4 coiled strands of oxygen-free silver-plated copper, protected by black PVC. The connection is 2Pin 0.78mm, while the plug is 3.5mm SE. The pin sleeve is a single, black cylinder, as is the splitter piece, although shorter in length. The pin is a small black plastic cylinder with an 8-shaped hole through which the wires pass. The sleeves of the 2Pin connectors are both black cylinders, slightly bevelled at the cable entry, with two rings near the cable exit. The right channel has a red plastic base from which the two gold-plated pins come out. A blue dot indicates the polarity. On the left side, the base is transparent. There is no velcro tape to hold the cable, but there is a plastic sleeve to protect the 3.5mm SE plug.
Personally, I love the almost custom design of the capsules, although I would have opted for a cable to enhance the beauty of the whole. The eternal dilemma is present: metal or resin capsules? That doesn't detract from the fact that the construction is still very good.
Adjustment and Ergonomics
The almost custom design may present some problems in smaller ears, while the thickness of the capsules is relatively large. The nozzles are short and the lack of a differentiated base can be a problem with tip insertion. The fit in my ears is shallow, completely adequate for the use of my home-made hybrid tips in size L. With them, the fit is very good, as is the isolation achieved. The capsules anchor well in my pinna and there is no rotation. The protrusion of the rim can get a bit annoying after a couple of hours. In this sense, the capsule is a bit short and the body does not completely jump the rim of the pinna, impinging on it and causing discomfort after a while. The fit is high and it could be used for daily outdoor use, even for the gym or running. Also, because its weight is quite light.
Sound
Profile
"The Quartet is Kiwi Ear's answer to those who want a fun in-ear monitor that delivers all the quality bass you need. In truth, the brand's claim is quite apt. The Quartet has two mini-switches. Switch 1 seems to affect the impedance, because it manages to limit the bass sensitivity by a difference of just over 3dB. Switch 2 modifies the mids from 1kHz. The difference achieved at 2khz is more than 2dB. All curves converge again from 4kHz onwards. So this is the frequency point from which the 4 frequency responses pivot. It is true that Kiwi Ears have aimed for a profile with an emphasis on bass-midrange. But I don't consider the Quartet to be Bass-Head monitors, because they have put a lot of care into boosting the mids, both the first half and the high-mids and treble. They are not clearly V-shaped IEMS, but more rounded W-shaped. The presence of the bass and high-mids can be modified depending on the position of the switches. A more bass profile can be achieved with position 10, a profile more excited in clarity with 01, while profiles 11 and 00 keep a similar relationship between bass and treble, but with a change in the overall energy of the ensemble, which affects its sensitivity.
I can't conceive of IEMS that only have bass, as much as I like it, and neglect the midrange and treble. The tunings of the Quartet may not be original, but one thing is clear: there is bass to enjoy, but also midrange and treble. And, moreover, in the right measure. But not only that, there is clarity, definition, resolution and dynamics. It is exciting to note the energy and texture of the bass, while the voices sound with a remarkable level of presence and clarity.
This is one of the first times I've found all the tunings of the Quartet switches to be useful. In position 01 they have a recall to my beloved Rose QT9 MK2s, but with more bite in the bass and, above all, high mids. In the 11 position they are surprisingly similar to the LetShuoer S12s, but even subtly softening the treble, one of the controversial points of the S12s. At the 00 position they have a tendency towards the Moondrop Kanas Pro, with slightly more bass-midrange and a much improved treble extension. Finally, in the more bass-heavy 01 position, the Quartets have a throwback to the controversial Hidizs MS5s with the Bass filter. So it's no surprise that every switch position on the Quartet is thoroughly useful and enjoyable. My favourite, though, is position 11.
Bass
The two settings with the most bass are the ones with switch 1 on. While position 11 is more balanced, setting 10 attenuates the upper-mids and turns the Quartet into a somewhat darker IEMS, where the bass is emancipated above the rest of the frequencies. In this position, the amount of energy and texture of the bass is more evident and enjoyable. At position 11, the punch is a little simpler and more controlled, while at 01 there is a little more of a more rumble and rubbery feel that lingers in the room. This sensation can be both attractive and detrimental, as it can be fatiguing due to its density, darkness and space occupied within the musical spectrum. The bass is somewhat slower and this lack of ability allows it to linger in the ambience. At position 11 these imbalances are slightly corrected, the bass becomes a little tighter and more concise, but maintains a good level of energy to continue to offer a dose of fun. The texture smooths out a little, but there are combinations of sources that make the texture really pleasant, even persuasive and suggestive.
Overall, the low end is rounded and extended, with a gentle dip towards the mids, something that brings a hint of warmth, body and physicality to the early mids. The low end reaches the first mids, even though its decay is not very pronounced.
In the pure tone test, the LFOs sound powerful, with a quite perceptible roughness, the tone is somewhat coloured and more audible than sensory, but quite full from very low. Vibration at the lower end is somewhat less natural, but is quickly corrected, generating a fairly natural sound at 40Hz, with a little colour, as mentioned above.
On a technical level, position 10 suffers a little more, with the bass lines being executed in a thicker and more voluminous way, which limits the level of layering, replacing it with a higher volume. Texture and volume overlap, generating a bass with more rumble. At position 11 the lines are thinner and the ability is increased, the balance is better, the definition is improved, as well as the sensation of speed.
For my taste, I would have preferred a higher tilt towards the sub-bass, avoiding a certain level of energy in the low-mid, to make it less bloated and somewhat cleaner. But, I can't help commenting that I really enjoy the low end of these Quartets, because, as they say, they give me the bass I want.
Mids
But, they also give me the mids I am looking for, in a set of IEMS with a noticeable bass presence. The party is never complete if the mids are off. And I have Kiwi Ears to thank for caring about this. If we look at the graph at position 11, the curve oscillates in a sub-10dB range, from 20Hz to 10kHz. There is a clear lift in the bass, but the mids are fairly flat in the first half, with emancipation varying according to the position of the switches. It is clear that switch 2 affects this area the most, but this is not the only one. It can be seen that position 11 and 00 are similar in bass, with a clear decrease in sensitivity, but with an increase in treble. But, beyond what is visible in the curves, the Quartets have completely convinced me in the mid-range. So much so that they have become my reference when listening to Amapiano. This South African-born House style is characterised by very deep bass lines, very powerful sub-bass, which contrasts with a very full presence of voices, both male and female, even combined. Treble and cymbals are usually very present and the recordings are usually clean, although somewhat excited in the mid-high range. The addition of IEMS with a lot of energy in this area becomes counterproductive. Well, the Quartets, in their 11th position, have become my best ally to reproduce this genre, because they provide richness and power in the lows and control the mid-highs, while showing very good presence in the voices and instruments, without losing sight of the details.
The male voices can't be said to be in the front row, but I don't find them remote. I'm satisfied with their level of presence, their slightly warmer timbre, also the physicality and body of their base, though I don't miss detail or texture either. It's no monster in these respects, but it does better than many other IEMS with such a present bass range. Perhaps a little more density, punch and presence can be missed in those male voices, but again I'm happy with them. With some switch settings you might gain in this respect and lose nuance and detail, some sparkle on the surface. But the balance is right, you just have to find the combination you like best. In my case it is position 11. The female voices receive a somewhat different treatment because of the ability to emphasise the mid-highs, something that can favour them in many respects. However, the energy level can be corrected, almost to taste, achieving a level of sparkle, brightness, emphasis that can border on sibilance or control it completely. Position 11 is at that limit that respects the sibilance, but perhaps not as clean and clear as you might wish, with the advantage that the bass is still powerful.
I continue to insist that the texture is remarkable in this midrange and that the level of detail, without being too explicit, is capable of delivering the minutiae of my test tracks, at a point beyond intuitive, something that is quite eloquent for a profile like this. And that must be thanks to the BA drivers, in conjunction with the tuning of the set.
What else can I say? Well, back to the beginning, I really like the relationship between the level of presence of the range, the representation of the instruments, the recreation of the voices, the level of detail, body, physicality, transparency and clarity, in relation to a lower range centred in its central part.
Treble
Both switches affect the treble. The first one, by reducing the presence of bass, gives them more prominence. While the second switch affects the mid-highs and first treble directly.
I consider that there is a good level of energy in the first part, as well as a good representation. The activation of the second switch adds an extra naturalness, while turning it off makes them drier, duller, as if lacking sparkle. In any case, the treble is controlled, almost smooth, but can be more exciting when the first switch is turned off. As well as the extension being decent, the amount of air is not very high, something that can be appreciated throughout the range, offering a sense of control and subtle nuance. This is not a critical listening headphone, though it is an enjoyable one. The ratio of power, energy, finesse, range, extension, delicacy, sparkle and brilliance is average. None of them stand out, but I don't miss anything either. Pretty good for my pretensions in this profile.
Soundstage, Separation
The scene is quite frontal, slightly oval, there is a lateral and stereo feeling, but it is not quite a 180º scene. Depth is felt, but it is not stratified in a well-defined way, the planes are not individualised and there is a slight blending in this aspect. The ethereal feel is average and doesn't stand out as being very voluminous, beyond the bass. This is something that affects the three-dimensionality and the recreation of the sound image. The separation is more noticeable laterally, but less in depth, not enveloping, but not flat either. But it does not stand out in this aspect. The placement of the elements is adequate, there is a good level of resolution, definition. The details are there, it offers a good descriptive feeling, but it lacks a certain spatial spark that separates and individualises them. The amount of air, sense of envelopment, level of transparency and 3D separation are simply sufficient.
Comparisons
Letshuoer D13
The small Letshuoer D13 with the Silver filter are in a similar price range. It is a single 13mm dynamic driver with DLC diaphragm. Their shape is very different, also differential, they are small and excellently built. Their fit is very good and they are comfortable, even better than the Quartet, more suitable for long sessions. Its metal construction does not penalise its weight and its considerably smaller volume favours it. The accessories are very good, a more adequate zipped case, a superior cable, with balanced options. In these non-sound aspects, I prefer the D13s.
In terms of sound (compared to the Quartet in position 11), the graphs seemed to reveal more similarities, but a quick switch between the two highlights the greater sensitivity of the D13s, as well as a clearer, cleaner, even brighter and more sparkling profile. I don't glimpse darkness, comparatively speaking, and find their profile more transparent, less physical, less dense and more airy. All in all, separation is more evident, detail is more discernible and both the scene and the image are superior.
If there's one thing the D13s excel at, it's bass, their tuning is comparatively clean and the level of texture, power and energy are excellent. You don't have to go Bass-Head to excel in bass and the D13s are a great example. The level of texture and descriptiveness is better on the D13s, while the Quartet's colour is more muted. The bass is denser, also darker, slower, lingers longer in the ambience. The D13s offer a tighter, more concise and tighter punch, more speed and less decay. Perhaps, on the negative side, you can see that their timbre is not as dark.
In the mid-range, the D13s do not offer as much density and are less smooth. There is more excitement in the range, the top end is more sparkling, gaining in clarity, transparency, focus and sharpness. There is more light. The Quartets are softer, denser, though more nuanced, with more darkness and less descriptiveness. They are also calmer and more relaxed. There is a point of excitement in the mid-highs of the D13s that may be more striking, to say the least. The Quartet's female vocals don't rise as high, nor are they as prominent as they are in the D13s.
The D13's treble is more linear and by starting higher, with a cleaner low end, they stand out a notch above the Quartet's. I also see more energy from them, as well as being louder and more sparkling.
Neither are special in staging or separation, but the D13s' greater cleanliness affects their separation, improving it, adding a better feel and distance between notes. Also, their level of detail seems more discernible. The Quartets are gentler in many respects, offering more tranquillity where the D13s can be a little more abrupt.
Conclusion
Continuing my search for IEMS with the best ratio of present bass to near midrange, without forgetting a defined sound, good resolution and detail, I find the Kiwi Ears Quartet. This nicely designed, pleasant and attractive model has two switches that allow you to generate 4 different tunings and all of them are useful. Each one reminds me of other IEMS I already own and like, making them a very versatile 4-in-1.
It is true that the Quartets have punch and strength in the lows, but the mids become very full, and even the highs, although soft, have a remarkable representation. They have a good level of detail, definition and resolution and their weak point is perhaps in the stage and separation section. All in all, these are IEMS in which the whole is greater than the sum of the individual parts, and that is what makes them very appreciable as an all-rounder.
Sources Used During the Analysis
Purchase Link
You can read the full review in Spanish here
Kiwi Ears is a fairly new IEMS brand, although they already have a few models under their belt, some of which have already attracted the attention of reviewers and enthusiasts. The Cadenza model is a fairly inexpensive IEMS set that has received excellent reviews. The Orchestra model is an 8BA monitor, while its Lite sibling also has the same number of drivers, but costs about half as much. Finally, the model I am currently reviewing, called the Quartet, is a 2DD + 2BA, designed around a new dual-driver superbaric dynamic subwoofer. The diaphragm used is 10mm titanium, each driven independently by dual magnetic circuits. The pair of drivers is passively aligned to synchronise in phase to avoid sound wave cancellation. The dynamic drivers were crossed over by a passive low-pass network at 350 Hz to provide rich, thick bass, while the mids from 350Hz to 1 kHz were tuned to be completely flat. The Quartet features a custom BA for mid-high and a custom BA tweeter for ultra-high frequencies. These drivers were modified to match the balance of the new dynamic drivers with a ventilation system tuned to provide more airflow. In the Kiwi Ears tradition, the balanced armatures are passively adjusted to match our internal target curvature for the mids and highs. Another important aspect is that it has two mini-switches to set the sound in 4 different curves.
Well, practically all this information has been extracted from the web. But, after this introduction, I guess it will be more interesting to talk about other aspects and, above all, its sound, at least from my point of view.
Specifications
- Driver Type: 2DD 10mm + 2BA.
- Frequency Response: 20Hz - 20kHz.
- Sensitivity: 110dB SPL/mW.
- Impedance: 32Ω
- Capsule Material: Medical Grade Resin
- THD: 0.3% THD: 0.3%
- Jack Connector: 3.5mm SE gold plated.
- Capsule Connection Type: 2Pin 0.78mm
Packaging
The Kiwi Ears Quartet comes in a medium-sized, purple box, whose dimensions are 131x113x66mm. On the front side, a realistic photo of the capsules can be seen in the centre. A little higher, on the left, is the logo of the brand, on the right, the slogan. Below is the model name, all in white letters. On the back is the model name in very large white letters, logos of the certifications it complies with, as well as the brand's brand name. Interestingly, the address is in Ireland and Manchester, but they are manufactured in China.
After removing the decorated outer cardboard, you see a completely black box, with a silver logo in the centre of the box. Underneath are the capsules inside a layer of foam lined with black cardboard. The model name is on the left side, while the logo is on the right side. Underneath this layer is the case with the rest of the accessories, which is black and has the logo in white. In summary, the complete contents are as follows:
- The two capsules.
- A zippered case.
- One instruction manual.
- The cable.
- One set of black silicone tips, sizes SxMxL.
- One set of grey silicone tips, sizes SxMxL.
- One set of white silicone tips, sizes SxMxL.
Each set of tips comes in an individual transparent zip pouch. The zippered case is a bit wider than usual, the problem is that it is a bit flat for the volume and size of the capsules. A few foam tips and some balanced cable termination are missing. But overall, the presentation is about average for the price.
Construction and Design
The Kiwi Ears Quartet are hand-made and hand-polished from medical grade resin. The shape is almost custom, with integral nozzles. The body is thick and the resin has a flowing purple and glitter pattern on a black base. The outer face has the gold logo on the inside. It is shaped like the African continent, although more stylised at the bottom edge. On the side are the two mini-switches, while the transparent piece that houses the 2Pin connection is integrated into the capsule and does not protrude. Nearby there is a small hole. The inner side has a protrusion on its edge, as an anchor. As I said, the nozzles are integral, there is no separation of any material and the flow pattern is continuous on them. They are not very long, it is difficult to measure their size as they are made in one piece. At their base, the oval diameter is 6mm maximum, while the rim is 6.6mm, with the same shape. The tip of the nozzle is not flat and has two generous holes, which are the channels through which the sound flows. The capsules are light, soft and smooth, pleasant to the touch and to the eye.
The cable consists of 4 coiled strands of oxygen-free silver-plated copper, protected by black PVC. The connection is 2Pin 0.78mm, while the plug is 3.5mm SE. The pin sleeve is a single, black cylinder, as is the splitter piece, although shorter in length. The pin is a small black plastic cylinder with an 8-shaped hole through which the wires pass. The sleeves of the 2Pin connectors are both black cylinders, slightly bevelled at the cable entry, with two rings near the cable exit. The right channel has a red plastic base from which the two gold-plated pins come out. A blue dot indicates the polarity. On the left side, the base is transparent. There is no velcro tape to hold the cable, but there is a plastic sleeve to protect the 3.5mm SE plug.
Personally, I love the almost custom design of the capsules, although I would have opted for a cable to enhance the beauty of the whole. The eternal dilemma is present: metal or resin capsules? That doesn't detract from the fact that the construction is still very good.
Adjustment and Ergonomics
The almost custom design may present some problems in smaller ears, while the thickness of the capsules is relatively large. The nozzles are short and the lack of a differentiated base can be a problem with tip insertion. The fit in my ears is shallow, completely adequate for the use of my home-made hybrid tips in size L. With them, the fit is very good, as is the isolation achieved. The capsules anchor well in my pinna and there is no rotation. The protrusion of the rim can get a bit annoying after a couple of hours. In this sense, the capsule is a bit short and the body does not completely jump the rim of the pinna, impinging on it and causing discomfort after a while. The fit is high and it could be used for daily outdoor use, even for the gym or running. Also, because its weight is quite light.
Sound
Profile
"The Quartet is Kiwi Ear's answer to those who want a fun in-ear monitor that delivers all the quality bass you need. In truth, the brand's claim is quite apt. The Quartet has two mini-switches. Switch 1 seems to affect the impedance, because it manages to limit the bass sensitivity by a difference of just over 3dB. Switch 2 modifies the mids from 1kHz. The difference achieved at 2khz is more than 2dB. All curves converge again from 4kHz onwards. So this is the frequency point from which the 4 frequency responses pivot. It is true that Kiwi Ears have aimed for a profile with an emphasis on bass-midrange. But I don't consider the Quartet to be Bass-Head monitors, because they have put a lot of care into boosting the mids, both the first half and the high-mids and treble. They are not clearly V-shaped IEMS, but more rounded W-shaped. The presence of the bass and high-mids can be modified depending on the position of the switches. A more bass profile can be achieved with position 10, a profile more excited in clarity with 01, while profiles 11 and 00 keep a similar relationship between bass and treble, but with a change in the overall energy of the ensemble, which affects its sensitivity.
I can't conceive of IEMS that only have bass, as much as I like it, and neglect the midrange and treble. The tunings of the Quartet may not be original, but one thing is clear: there is bass to enjoy, but also midrange and treble. And, moreover, in the right measure. But not only that, there is clarity, definition, resolution and dynamics. It is exciting to note the energy and texture of the bass, while the voices sound with a remarkable level of presence and clarity.
This is one of the first times I've found all the tunings of the Quartet switches to be useful. In position 01 they have a recall to my beloved Rose QT9 MK2s, but with more bite in the bass and, above all, high mids. In the 11 position they are surprisingly similar to the LetShuoer S12s, but even subtly softening the treble, one of the controversial points of the S12s. At the 00 position they have a tendency towards the Moondrop Kanas Pro, with slightly more bass-midrange and a much improved treble extension. Finally, in the more bass-heavy 01 position, the Quartets have a throwback to the controversial Hidizs MS5s with the Bass filter. So it's no surprise that every switch position on the Quartet is thoroughly useful and enjoyable. My favourite, though, is position 11.
Bass
The two settings with the most bass are the ones with switch 1 on. While position 11 is more balanced, setting 10 attenuates the upper-mids and turns the Quartet into a somewhat darker IEMS, where the bass is emancipated above the rest of the frequencies. In this position, the amount of energy and texture of the bass is more evident and enjoyable. At position 11, the punch is a little simpler and more controlled, while at 01 there is a little more of a more rumble and rubbery feel that lingers in the room. This sensation can be both attractive and detrimental, as it can be fatiguing due to its density, darkness and space occupied within the musical spectrum. The bass is somewhat slower and this lack of ability allows it to linger in the ambience. At position 11 these imbalances are slightly corrected, the bass becomes a little tighter and more concise, but maintains a good level of energy to continue to offer a dose of fun. The texture smooths out a little, but there are combinations of sources that make the texture really pleasant, even persuasive and suggestive.
Overall, the low end is rounded and extended, with a gentle dip towards the mids, something that brings a hint of warmth, body and physicality to the early mids. The low end reaches the first mids, even though its decay is not very pronounced.
In the pure tone test, the LFOs sound powerful, with a quite perceptible roughness, the tone is somewhat coloured and more audible than sensory, but quite full from very low. Vibration at the lower end is somewhat less natural, but is quickly corrected, generating a fairly natural sound at 40Hz, with a little colour, as mentioned above.
On a technical level, position 10 suffers a little more, with the bass lines being executed in a thicker and more voluminous way, which limits the level of layering, replacing it with a higher volume. Texture and volume overlap, generating a bass with more rumble. At position 11 the lines are thinner and the ability is increased, the balance is better, the definition is improved, as well as the sensation of speed.
For my taste, I would have preferred a higher tilt towards the sub-bass, avoiding a certain level of energy in the low-mid, to make it less bloated and somewhat cleaner. But, I can't help commenting that I really enjoy the low end of these Quartets, because, as they say, they give me the bass I want.
Mids
But, they also give me the mids I am looking for, in a set of IEMS with a noticeable bass presence. The party is never complete if the mids are off. And I have Kiwi Ears to thank for caring about this. If we look at the graph at position 11, the curve oscillates in a sub-10dB range, from 20Hz to 10kHz. There is a clear lift in the bass, but the mids are fairly flat in the first half, with emancipation varying according to the position of the switches. It is clear that switch 2 affects this area the most, but this is not the only one. It can be seen that position 11 and 00 are similar in bass, with a clear decrease in sensitivity, but with an increase in treble. But, beyond what is visible in the curves, the Quartets have completely convinced me in the mid-range. So much so that they have become my reference when listening to Amapiano. This South African-born House style is characterised by very deep bass lines, very powerful sub-bass, which contrasts with a very full presence of voices, both male and female, even combined. Treble and cymbals are usually very present and the recordings are usually clean, although somewhat excited in the mid-high range. The addition of IEMS with a lot of energy in this area becomes counterproductive. Well, the Quartets, in their 11th position, have become my best ally to reproduce this genre, because they provide richness and power in the lows and control the mid-highs, while showing very good presence in the voices and instruments, without losing sight of the details.
The male voices can't be said to be in the front row, but I don't find them remote. I'm satisfied with their level of presence, their slightly warmer timbre, also the physicality and body of their base, though I don't miss detail or texture either. It's no monster in these respects, but it does better than many other IEMS with such a present bass range. Perhaps a little more density, punch and presence can be missed in those male voices, but again I'm happy with them. With some switch settings you might gain in this respect and lose nuance and detail, some sparkle on the surface. But the balance is right, you just have to find the combination you like best. In my case it is position 11. The female voices receive a somewhat different treatment because of the ability to emphasise the mid-highs, something that can favour them in many respects. However, the energy level can be corrected, almost to taste, achieving a level of sparkle, brightness, emphasis that can border on sibilance or control it completely. Position 11 is at that limit that respects the sibilance, but perhaps not as clean and clear as you might wish, with the advantage that the bass is still powerful.
I continue to insist that the texture is remarkable in this midrange and that the level of detail, without being too explicit, is capable of delivering the minutiae of my test tracks, at a point beyond intuitive, something that is quite eloquent for a profile like this. And that must be thanks to the BA drivers, in conjunction with the tuning of the set.
What else can I say? Well, back to the beginning, I really like the relationship between the level of presence of the range, the representation of the instruments, the recreation of the voices, the level of detail, body, physicality, transparency and clarity, in relation to a lower range centred in its central part.
Treble
Both switches affect the treble. The first one, by reducing the presence of bass, gives them more prominence. While the second switch affects the mid-highs and first treble directly.
I consider that there is a good level of energy in the first part, as well as a good representation. The activation of the second switch adds an extra naturalness, while turning it off makes them drier, duller, as if lacking sparkle. In any case, the treble is controlled, almost smooth, but can be more exciting when the first switch is turned off. As well as the extension being decent, the amount of air is not very high, something that can be appreciated throughout the range, offering a sense of control and subtle nuance. This is not a critical listening headphone, though it is an enjoyable one. The ratio of power, energy, finesse, range, extension, delicacy, sparkle and brilliance is average. None of them stand out, but I don't miss anything either. Pretty good for my pretensions in this profile.
Soundstage, Separation
The scene is quite frontal, slightly oval, there is a lateral and stereo feeling, but it is not quite a 180º scene. Depth is felt, but it is not stratified in a well-defined way, the planes are not individualised and there is a slight blending in this aspect. The ethereal feel is average and doesn't stand out as being very voluminous, beyond the bass. This is something that affects the three-dimensionality and the recreation of the sound image. The separation is more noticeable laterally, but less in depth, not enveloping, but not flat either. But it does not stand out in this aspect. The placement of the elements is adequate, there is a good level of resolution, definition. The details are there, it offers a good descriptive feeling, but it lacks a certain spatial spark that separates and individualises them. The amount of air, sense of envelopment, level of transparency and 3D separation are simply sufficient.
Comparisons
Letshuoer D13
The small Letshuoer D13 with the Silver filter are in a similar price range. It is a single 13mm dynamic driver with DLC diaphragm. Their shape is very different, also differential, they are small and excellently built. Their fit is very good and they are comfortable, even better than the Quartet, more suitable for long sessions. Its metal construction does not penalise its weight and its considerably smaller volume favours it. The accessories are very good, a more adequate zipped case, a superior cable, with balanced options. In these non-sound aspects, I prefer the D13s.
In terms of sound (compared to the Quartet in position 11), the graphs seemed to reveal more similarities, but a quick switch between the two highlights the greater sensitivity of the D13s, as well as a clearer, cleaner, even brighter and more sparkling profile. I don't glimpse darkness, comparatively speaking, and find their profile more transparent, less physical, less dense and more airy. All in all, separation is more evident, detail is more discernible and both the scene and the image are superior.
If there's one thing the D13s excel at, it's bass, their tuning is comparatively clean and the level of texture, power and energy are excellent. You don't have to go Bass-Head to excel in bass and the D13s are a great example. The level of texture and descriptiveness is better on the D13s, while the Quartet's colour is more muted. The bass is denser, also darker, slower, lingers longer in the ambience. The D13s offer a tighter, more concise and tighter punch, more speed and less decay. Perhaps, on the negative side, you can see that their timbre is not as dark.
In the mid-range, the D13s do not offer as much density and are less smooth. There is more excitement in the range, the top end is more sparkling, gaining in clarity, transparency, focus and sharpness. There is more light. The Quartets are softer, denser, though more nuanced, with more darkness and less descriptiveness. They are also calmer and more relaxed. There is a point of excitement in the mid-highs of the D13s that may be more striking, to say the least. The Quartet's female vocals don't rise as high, nor are they as prominent as they are in the D13s.
The D13's treble is more linear and by starting higher, with a cleaner low end, they stand out a notch above the Quartet's. I also see more energy from them, as well as being louder and more sparkling.
Neither are special in staging or separation, but the D13s' greater cleanliness affects their separation, improving it, adding a better feel and distance between notes. Also, their level of detail seems more discernible. The Quartets are gentler in many respects, offering more tranquillity where the D13s can be a little more abrupt.
Conclusion
Continuing my search for IEMS with the best ratio of present bass to near midrange, without forgetting a defined sound, good resolution and detail, I find the Kiwi Ears Quartet. This nicely designed, pleasant and attractive model has two switches that allow you to generate 4 different tunings and all of them are useful. Each one reminds me of other IEMS I already own and like, making them a very versatile 4-in-1.
It is true that the Quartets have punch and strength in the lows, but the mids become very full, and even the highs, although soft, have a remarkable representation. They have a good level of detail, definition and resolution and their weak point is perhaps in the stage and separation section. All in all, these are IEMS in which the whole is greater than the sum of the individual parts, and that is what makes them very appreciable as an all-rounder.
Sources Used During the Analysis
- Aune X8 XVIII Magic DAC + EarMen ST-Amp.
- Aune M1P.
- Tempotec March III.
Linsoul Audio Store, offered me this model, in exchange for writing an honest review. I want to make it clear that all my opinions written in this review have not been conditioned by this fact, nor will I ever write anything that I do not really think or feel here. I will only write about my personal opinion in relation to the revised product.
Purchase Link
You can read the full review in Spanish here
Ferdinando1968
Great review. Very detailed.
InvisibleInk
My impression is the ill-fitting large shell with a shallow, thick nozzle, dooms this set. Any otherwise interesting technical aspects are rendered moot by the poor shell implementation. If the IEM don’t fit, you should not buy it.
Disclaimer: Linsoul loaned me with a review unit. All thoughts and opinions are my own. Unaffiliated product link.
The included accessories are pretty decent: a zippered semi-hard case with Kiwi Ears logo, 9 sets of eartips, and a 3.5mm 4-core oxygen-free silver plated cable terminated in 2-pin 0.78mm. The case is pretty much identical to the one in the Orchestra Lite and I find it good enough, although I would like it slightly taller as the IEM does feel a bit compressed when eartips are installed (similar issue with the Orchestra Lite). The eartips are available in 3 different sizes and colours, but I don't think there are any significant difference between the colours to my ears. I personally used the large black-red eartips for the duration of the review. The cable is decent, but not spectacular. I would recommend switching to a nice pure copper cable. Surprisingly, I could not find a tool to change the tuning switches. Normally, IEMs with tuning switches will include a tool similar to a SIM card ejector pin, but I simply did not see it in my package.
On the IEM itself, I find the build quality to be quite premium. The purple-black medical-grade resin looks and feels elegant and robust. The nozzle is also moulded from the same resin, which is also usually my preferred construction. I didn't find any issues with changing the tuning switches using a SIM ejector tool. Comfort-wise, I don't find any issues with the Quartet and I can wear it all day easily with little fatique.
Setup: Large stock eartips (black-red), stock cable
Music Sources: Local FLAC (redbook/hi-res), Tidal Masters, Apple Music Lossless
Listening impression is a very subjective experience depending on individual ear shape, choice of eartips, music library, and personal preferences, so your experience may vary.
Kiwi Ears Quartet's sound signature can be generally described to be quite thick in the bass region, with a more relaxed upper mids and treble. The tuning switches of course can adjust the sound slightly, but all 4 possible tuning settings still exhibit this signature. The first switch controls the bass response, while the second switch controls the mids and treble region. Here's a quick rundown of my impression of each tuning:
The review from now on will be done mostly with the switches in my preferred configuration: 1 OFF and 2 ON.
I also tried the Quartet with some different cable materials and eartips. I do find some marginal improvement going with a pure copper cable, giving a more consistent bass texture. Going with wide bore eartips like TRI Clarion brought forward the upper mids further and slightly improved its resolution. However, I still think the stock tips are generally acceptable.
I find that overall, EA500 has superior technicalities over the Quartet, in terms of resolution, soundstage, imaging, and layering. Bass response is also tighter with the EA500, even though the subbass extension is still better with the Quartet. With my preference, I would say EA500 to be better than Quartet, especially for critical listening. However, I can still see the possibility that those who are sensitive to upper mids zing would prefer Quartet.
7Hz Salnotes Dioko ($99):
Dioko offers a more balanced tuning overall with great technical performance. However, it does suffer from thin note weight and lack of musicality. On the other hand, the Quartet trades off technical prowess with better musicality. So, between the two, I find that both of them offers great value for the price, but it really depends on your priorities in sound.
Truthear Hexa ($80):
For a similar priced hybrid, I think Hexa is a good comparison. While Quartet outperforms the Hexa in rendering of bass, Hexa does midrange better and cleaner than Quartet. I find the vocals to be more forward with Hexa, but overall instruments sound more lifelike with the Quartet. I think this is another musicality vs technicality battle, and again your choice will be heavily dependent on your priorities in music or Quartet's place in your collection. I would personally go with Quartet since it does offer something different from the usual technicalities-focused IEMs of the recent times.
Introduction & Packaging
Kiwi Ears Quartet ($109) is the fourth IEM coming out of Kiwi Ears, which is apt considering it's named "Quartet" as well. Further on the theme of "four", the Quartet features 4 drivers: 2 dynamic drivers and 2 balanced armatures, with the dynamic drivers in an isobaric configuration, making them effectively functioning as a single dynamic driver (no word whether it is a push-push or push-pull configuration). The remaining 2 balanced armatures are each handling the mids and the treble.The included accessories are pretty decent: a zippered semi-hard case with Kiwi Ears logo, 9 sets of eartips, and a 3.5mm 4-core oxygen-free silver plated cable terminated in 2-pin 0.78mm. The case is pretty much identical to the one in the Orchestra Lite and I find it good enough, although I would like it slightly taller as the IEM does feel a bit compressed when eartips are installed (similar issue with the Orchestra Lite). The eartips are available in 3 different sizes and colours, but I don't think there are any significant difference between the colours to my ears. I personally used the large black-red eartips for the duration of the review. The cable is decent, but not spectacular. I would recommend switching to a nice pure copper cable. Surprisingly, I could not find a tool to change the tuning switches. Normally, IEMs with tuning switches will include a tool similar to a SIM card ejector pin, but I simply did not see it in my package.
On the IEM itself, I find the build quality to be quite premium. The purple-black medical-grade resin looks and feels elegant and robust. The nozzle is also moulded from the same resin, which is also usually my preferred construction. I didn't find any issues with changing the tuning switches using a SIM ejector tool. Comfort-wise, I don't find any issues with the Quartet and I can wear it all day easily with little fatique.
Sound Impression
Sources: Topping D90SE/A90D stack, Fiio M11S, L&P W2-131 (all single-ended)Setup: Large stock eartips (black-red), stock cable
Music Sources: Local FLAC (redbook/hi-res), Tidal Masters, Apple Music Lossless
Listening impression is a very subjective experience depending on individual ear shape, choice of eartips, music library, and personal preferences, so your experience may vary.
Kiwi Ears Quartet's sound signature can be generally described to be quite thick in the bass region, with a more relaxed upper mids and treble. The tuning switches of course can adjust the sound slightly, but all 4 possible tuning settings still exhibit this signature. The first switch controls the bass response, while the second switch controls the mids and treble region. Here's a quick rundown of my impression of each tuning:
- 1 - OFF, 2 - OFF : warm-dark
- 1 - ON, 2 - ON : slight V-shape
- 1 - ON, 2 - OFF : warmer-dark
- 1 - OFF, 2 - ON : balanced (my preference)
The review from now on will be done mostly with the switches in my preferred configuration: 1 OFF and 2 ON.
Bass
Bass is Quartet's strongest defining characteristics. The isobaric configuration definitely helps with the bass tactility and overall texture, keeping it in pace with a more complex tracks like Dragonforce's "Through the Fire and Flames". If one should turn on the bass switch on, it does increase the bass amount a bit, but at the expense of a slower decay, making the bass too overly thick to my liking. Hence, the bass switch remained off during my time with the Quartet.Midrange
I do find the midrange slightly fuzzy and do struggle with vocals especially. There are some bleed from the midbass, but I do feel that it is done intentionally to give a more laid-back listening experience. Male vocals are generally more well-represented here. "Galaxy Express 999" by Platina Jazz is one such track where the deep and lush vocal performance of Niklas Gabrielsson is amazingly rendered by the Quartet. The details reproduction does still suffer from the fuzziness and the bleed, but that's more of a nitpick rather than a real problem, especially at this price point.Treble
With the second switch off, the treble does seem dark and quite grainy; with that switch on, the treble does not just improve in quantity but also in quality in my opinion. Hence, this switch remained on for the longest time for me. There is decent amount of air and upper treble extensions, with quite good amount of resolution and dynamics.Technicalities
Overall details resolution is average for the price. Coherence could be better. Soundstage and imaging are decent, still mostly in-your-head experience most of the time, which then also impacts the layering negatively. Despite all that, I do think that the tuners do have a priority in mind here, which is Quartet's relaxed tonality. While the weaker technicalities made it not a critical listening IEM, the Quartet sure does give a generally more pleasant and non-fatiquing listening experience.Driving Requirements & Pairing Suggestion
Quartet does not need a lot of power to sound its best. I can comfortably drive it at low gain settings in single-ended for most of the testing. I would recommend a neutral or slightly-bright source for Quartet to even out its warmer tonality.I also tried the Quartet with some different cable materials and eartips. I do find some marginal improvement going with a pure copper cable, giving a more consistent bass texture. Going with wide bore eartips like TRI Clarion brought forward the upper mids further and slightly improved its resolution. However, I still think the stock tips are generally acceptable.
Select Comparisons
Simgot EA500 ($79):I find that overall, EA500 has superior technicalities over the Quartet, in terms of resolution, soundstage, imaging, and layering. Bass response is also tighter with the EA500, even though the subbass extension is still better with the Quartet. With my preference, I would say EA500 to be better than Quartet, especially for critical listening. However, I can still see the possibility that those who are sensitive to upper mids zing would prefer Quartet.
7Hz Salnotes Dioko ($99):
Dioko offers a more balanced tuning overall with great technical performance. However, it does suffer from thin note weight and lack of musicality. On the other hand, the Quartet trades off technical prowess with better musicality. So, between the two, I find that both of them offers great value for the price, but it really depends on your priorities in sound.
Truthear Hexa ($80):
For a similar priced hybrid, I think Hexa is a good comparison. While Quartet outperforms the Hexa in rendering of bass, Hexa does midrange better and cleaner than Quartet. I find the vocals to be more forward with Hexa, but overall instruments sound more lifelike with the Quartet. I think this is another musicality vs technicality battle, and again your choice will be heavily dependent on your priorities in music or Quartet's place in your collection. I would personally go with Quartet since it does offer something different from the usual technicalities-focused IEMs of the recent times.
Conclusion
Quartet is an easy IEM to like and enjoy. However, coming off the heels of the excellent Orchestra Lite and the value king Cadenza, I do worry slightly that the Quartet might be overshadowed. That said, I still personally think that Quartet is a solid IEM in isolation, giving you more options with tuning switches, great build quality, decent accessories, and overall relaxed presentation.