KEFINE Klean

General Information

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FEATURES:

● The DLC-diaphragm dynamic driver offers a high clarity sound with better extension.

● Dual-cavity structure for accurate sound.

● Interchangeable tuning nozzles for the needs of different sound preferences.

● High quality silver-plated copper wire for clean sound.

● Metal injection housing for stable and long lasting built quality.


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SPECIFICATION:

MODEL:
KEFINE KLEAN
IMPEDANCE: 32Ω
SENSITIVITY: 107dB
FREQUENCY RESPONSE: 20Hz - 20kHz
CABLE LENGTH: 1.2m
PIN TYPE: 0.78mm 2-PIN CONNECTOR
PLUG TYPE: 3.5mm
DRIVER UNIT(S): 1 DYNAMIC DRIVER

Latest reviews

Ichos

Reviewer at hxosplus
Excellent entry-level earphones
Pros: + Balanced tuning with tasty bass
+ Competitive technicalities
+ Natural timbre
+ Musical and engaging
+ Mid-range presence and polite treble
+ Good imaging
+ Two tuning options
+ Very well made
+ Beautiful looking and very comfortable
+ High quality cable and nice carrying case
+ Affordable with great value for money
Cons: - Not that resolving or refined
- The treble lacks in technicalities
- Narrow and flat soundstage
- One set of ear-tips
- Not that lightweight for the size
KEFINE

KEFINE is an emerging brand founded by a group of audio enthusiasts driven by their passion for the hobby. With prior experience in earphone manufacturing, they united to realize their vision of superior sound quality. The KEFINE brand is dedicated to producing earphones that deliver an outstanding price-to-performance ratio while ensuring high-quality sound craftsmanship. To date, they have developed three models: the Klanar, the Delci, and their newest addition, the Klean.

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KEFINE Klean

The KEFINE Klean is a budget-friendly, entry-level earphone equipped with a 10mm dynamic driver that incorporates a diaphragm constructed from diamond-like carbon (DLC). This sophisticated material is recognized for its exceptional clarity, detail, and extended high-frequency response.

Additionally, the Klean is designed with a dual-cavity driver architecture and interchangeable nozzles to accommodate individual sound preferences. The silver nozzle provides a warm and smooth auditory experience, whereas the black nozzle produces a higher resolution with brighter and more transparent sound. The threaded design facilitates quick and easy nozzle changes.

Non Audio stuff

The ear-shells are crafted using an alloy casting technique and subsequently polished to achieve a sleek black finish. The faceplates are secured to the main body with screws, a method that mitigates the risk of damage from adhesive failure or external forces, thereby enhancing the product's durability. Similar to the Delci, the Klean is exceptionally well-constructed, exceeding all expectations given its price point.

While the design of the KEFINE Klean may appear simple and minimalistic, it possesses a level of sophistication and appeal. Although the ear-shells may not be particularly lightweight for their size, they are compact and feature a contoured design that conforms to the natural shape of the human ear. The Klean offers a high degree of comfort and a discreet appearance, seamlessly fitting into the ears to provide a stable and stress-free experience with effective noise attenuation.

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Cable and accessories

KEFINE provides their earphones with premium cables, and the Klean model is no exception. It features a 2-pin detachable cable constructed from high-purity silver-plated copper wires, designed in a two-core braided format. The cable is equipped with a 3.5mm aluminum plug, ensuring it is both soft and lightweight, while minimizing microphonic noise and preventing tangling. This high-quality cable offers excellent handling and aesthetically complements the Klean, making it a worthwhile investment for the price.

The package comprises three sets of silicone ear tips, a cable, two sets of tuning nozzles, and an attractive carrying case featuring a side zipper.

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Power needs

Entry-level earphones are designed to be easily driven, as the majority of consumers will utilize them through the 3.5mm jack of their smartphones or a basic USB DAC dongle. The KEFINE Klean features an impedance of 32Ω and a sensitivity of 107dB, making it particularly easy to drive. This allows for an enjoyable listening experience with portable USB DACs such as the FiiO JA11 or the Kiwi Ears Allegro Mini.

Audio stuff

Let's start with the silver nozzles.

Consumers shopping in the $40-50 price range are likely to seek earphones primarily for casual listening rather than for critical audiophile use.

Recognizing this, the seasoned KEFINE team opted for a sound profile that promotes smooth and enjoyable listening experiences, catering to the preferences of the majority.

In a departure from typical practices, they maintained a balanced tuning that avoids extreme frequency responses. The Klean features a gentle bass emphasis with commendable sub-bass extension, present mids, and a smooth yet clear treble.

The overall sound signature strikes a balance, neither overly V-shaped nor U-shaped, while emphasizing the significance of the mid-range without excessive focus on either the bass or treble.

The KEFINE Klean is a versatile earphone that performs admirably across various music genres, appealing to a broad audience, with the exception of those seeking a specialized or highly technical audio experience.

The treble response of the Klean is characterized by a smooth and unobtrusive quality, which some may perceive as lacking vibrancy; however, it remains impressively clear and well-articulated. It strikes a balance between lightness and sparkle, preventing a dark tonal character while avoiding excessive sharpness or brightness. The timbre is natural enough, though it may exhibit a slight metallic quality, particularly with higher-pitched orchestral instruments.

In terms of detail retrieval and overall resolution, the Klean performs satisfactorily within its category, though it does not offer significant depth or exceptional analytical capabilities. While it may not be the most technically sophisticated option, it makes up for this with its inherently musical character.

The mid-range exhibits a well-balanced tuning, characterized by a lack of significant recession or excessive brilliance in the upper mid-range. This results in a neutral sound profile that is pleasant to the ear, minimizing the risk of listening fatigue.

The clarity and articulation are very good, free from the masking effects often associated with mid-bass bloat. With its vibrant and harmonious tonal variety, the Klean effectively engages the listener with their preferred music.

The thoughtfully accentuated bass enhances the listening experience across various musical genres, remaining sufficiently in tune for more discerning listening, provided one is aware of its limitations.

Its technical performance is competitive; the bass is quick, well-defined, and controlled, featuring moderately rich textures that are not overly lean. While the Klean may not deliver extreme punchiness or impact, it still offers a satisfying dynamic range.

The soundstage is somewhat narrow and lacks significant depth; however, it provides adequate space and reasonable imaging, allowing the listener to perceive the intricacies of the music without descending into a messy sound experience.

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With the black nozzles

The black tips enhance the upper mid-range and treble frequencies, while subtly reducing the bass, resulting in a more vibrant sound profile for the Klean. This configuration allows the Klean to produce a clearer and more brilliant sound without becoming harsh or piercing. Additionally, the bass achieves greater tonal precision while maintaining its rich and dynamic quality.

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Comparison with the KEFINE Delci

The KEFINE Delci is priced at $10 above the Klean, leading some to question whether the additional expenditure for the Delci is justified.

The response to this inquiry is straightforward: the Delci offers a warmer and more relaxed sound profile compared to the Klean, featuring a treble that is less airy and sparkly. However, there are additional qualities that warrant the extra $10 for those who prefer this tonal balance. The Delci provides greater resolution, delivering a more expansive sound than its counterpart, along with a wider soundstage and a bass response that is both punchier and more technically refined.

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Conclusion

The Klean serves as further evidence that KEFINE possesses a remarkable ability to produce earphones that appeal to a wide audience while maintaining affordability.

The KEFINE Klean is constructed with superior craftsmanship and delivers sound quality that exceeds expectations for its price point, positioning it as an excellent entry-level choice and a genuine value in a highly competitive market.

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The review sample was kindly provided free of charge in exchange for an honest review. I don't use affiliate links. The price of the KEFINE Klean is $49 and you can buy it from Linsoul.

Disclaimer: For various Google indexing reasons, most parts of this review have been processed with an automatic paragraph rewriting tool. However it reads exactly the same as the original content that is available in my website.
Last edited:

thought of Coffee

100+ Head-Fier
Kefine Klean : The IEM to start audiophile journey
Pros: -Very mature sound
- Robust build
- Comfy fit
- Deep bass
- natural vocals
- Detailed but quite smooth treble
- Good amount of separation and stage
- Two types of preference for nozzle
Cons: - Stock cable is good but comes in single ended
- For better sounding needs copper cable
- After market eartips must needed

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Disclaimer:

Thanks Kefine for sending Klean as a review unit. They didn't provide me anything to influence this product. I will be unbiased and share my thought about Kefine Klean

I would like to mention one more thing:This review is based on my personal music preference and sources cause music preference varies person to person and sources

If you want to buy one of this visit
https://www.amazon.com/dp/B0DK4WR4FJ/kefine+klean/?tag=headfi-20&th=1
https://www.aliexpress.com/item/1005007957993609.html?dp=2458032497&af=32858&aff_fcid=6ac2254075cd4a0393365ccb87537b3c-1738428517551-08716-_Dc7G5vh&tt=CPS_NORMAL&aff_fsk=_Dc7G5vh&aff_platform=portals-tool&sk=_Dc7G5vh&aff_trace_key=6ac2254075cd4a0393365ccb87537b3c-1738428517551-08716-_Dc7G5vh&terminal_id=79ea47c9cdd44614b76768305164cb1a&afSmartRedirect=y&gatewayAdapt=4itemAdapt
https://hifigo.com/products/kefine-klean
or you are from Bangladesh
https://geekmartbd.com/

Specifications:

MODEL: KEFINE KLEAN
IMPEDANCE: 32Ω
SENSITIVITY: 107dB
FREQUENCY RESPONSE: 20Hz - 20kHz
CABLE LENGTH: 1.2m
PIN TYPE: 0.78mm 2-PIN CONNECTOR
PLUG TYPE: 3.5mm
DRIVER UNIT(S): 1 DYNAMIC DRIVER
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Unboxing Expirence:

The unboxing expirence of klean is very simple . In the box you will have the iems, a 3.5 mm cable, a hard carrying pouch, two types of tuning preference nozzle and some eartips.

Introduction:

Ok.. I thing I'm quite late for review of klean but at a time klean doesn't or may not disappear upcoming time . Cz the sound, value it offers is quite hard to beat . Klean is the first product for me from Kefine their other product like delci , klanner wasn't type of mine preference. But klean was a totally different experience for me which I'm gonna share later in my review

Pairing:

Usually I don't test any IEM in just stock form I always do swaping cable, tips rolling , matching source to get the best outcome. When I was testing Klean my favorite pairing was cable : Dunu lyra mini
Tips : Dunu Candy

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Cable:​

Stock
Dunu lyra mini

Eartips:​

Dunu Candy
Divenus Velvet

Sources:

Dongle:
Ibasso Dc04 Pro
Ibasso Dc Elite
Cayin RU7
Ddhifi tc44Pro E2
DAP:
Cayin N3 Ultra
Ibasso DX180
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Build and Design:


These Kefine Klean IEMs are made of solid metal alloy construction, making them both durable and good looking. Further, the design is pretty minimalist but manages to look elegant with well-crafted faceplates and compact form factor. The interchangeable nozzles definitely add a layer of customization for user preference. The cable is sturdy and tangle resistant and has minimal microphonics, further contributing to the user experience.

Fit and Comfort:


Despite their metal build, the Klean IEMs are designed for comfort. The ergonomic shape ensures a secure fit, accommodating various ear sizes without causing discomfort during extended listening sessions. The weight is balanced, and the angular design aids in achieving a good seal, which is crucial for optimal sound quality and noise isolation. Users have reported that the Klean provides better isolation and comfort compared to some competitors, making them suitable for prolonged use.
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Tuning nozzle:

Kefine Klean offers two nozzles in the box one is Silver and another one is Black. Difference between them maybe not huge but they are quite noticeable .

Black Nozzle:

The Klean, once fitted with a black nozzle, will sound brighter with emphasis on treble, making the sound more detailed and crisp. Furthermore, this also has been stated by some people to introduce a slight sibilance to the sound, in which the hisses at high frequency are stressed.

Silver nozzle:

Warmer and more even in sound profile, this presents the audiophile's dream of richness and coherence. It focuses on milky rhythm presentation with pleasant note weight, thus cleaning up for the heavier low-end frequency presentation; it is more adept at those who will look for a more laid-back presentation with the music being upbeat.

Note: this review is based on Silver nozzle

Sound Quality

Sub-bass :​


The Klean has a satisfying sub-bass presentation, digging deep to give that palpable rumble which complements genres such as electronic and hip-hop well. The low-end is all about the sub-bass; it's a hard-lined attack with a fast thud approach that makes the bass engaging at this price point. It isn't the most dominant, but it provides a solid foundation in the overall sound without overwhelming other frequencies. This balance ensures that tracks with pronounced low-end elements are rendered with both power and clarity, offering listeners an immersive experience.

Mid-bass :


On the mid-bass, Klean keeps up a strong, controlled presence.Bass guitars and kick drums come through authoritative to provide a full-bodied, thick sound that remains tight and refined. The mid-bass is less elevated than the sub-bass but is still pretty impactful to make sure the bass doesn't sound too forward or overpowering in the mix. That way, the bass response will be fun and engaging without sacrificing clarity or detail in the midrange.
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Male Vocals :

Male vocals on the Klean sound clear and warm. The very slightly warm nature of the mids makes the male voices natural and intimate yet never honky or shouty. The balance here is nothing short of amazing, since it lets the vocals be on top without overwriting everything in the mix. This results in a very smooth and enjoyable listen, especially in genres with a strong focus on vocals.

Female Vocals :

The clean and slightly forward upper mids on the Klean help the female vocals. Tuning here is done so that the female voices come through clear and detailed yet not sharp or sibilant. Natural and lively upper frequencies create an engaging and real-life-like female vocal portrayal, full of expressiveness and emotional resonance.
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Instrument Separation :

The Klean is commendable for instrument separation, given its price. It is easy to tell which instrument is playing at any moment in a complicated track, and each element has its own space without sounding congested. This clarity ensures that intricate musical passages are rendered with precision, allowing for an immersive and detailed listening experience.
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Soundstage and Imaging :

The soundstage of the Klean is medium-sized, neither too cramped nor too wide. Imaging is quite good and allows the listener to place instruments with a good sense of their shapes and directions. This capability adds to the overall immersive quality of the listening experience, making the Klean a compelling choice for those seeking both accuracy and engagement in their audio.

Testing Tracks:

Anchor - Novo Amor
A Thousand Years - Christina Perri
Back In Black - AC-DC
Billie Jean - Michael Jackson
Bohemian Rhapsody - Queens
Careless Whisper - George Michael
Darling Pretty - Mark Knopfler
Gangster Paradise - Coolio
Get Lucky- Daft Punk
Happy Nations- Ace of Base
Imagine- Jhon Lennon
Immigrant Song- Led Zeppelin
Just The Two of Us- Grover Washington Jr.
Kiss From A Rose - Seal
Kill Jill- Big Boi
Let Her Go - Passenger
Lose Yourself to Dance- Daft Punk
Moby Dick- Led Zeppelin
Pale Blue Dot - Dream Theater
Playing God- Polyphia
Portable Door - Deep Perple
Power of Love- Laura Branigan
Pretty Little Thing- Michael Jackson
Stand By Me- Ben E. King

Finally, in this fast changing market nothing stays for long but I believe that in 2025 Klean will also compete with others . And if somebody ask me is it worth after all these month I will say yes it worths every penny for its mature sound, excellent build and fit .

That was my thoughts about Kefine Klean. Let me know your thought about this IEM Till then keep listening .

Jarlaxle

100+ Head-Fier
Another Winner
Pros: Balanced and pleasing tonality
Nice timbre
Great imaging
Cons: Pillowy bass
Mediocre soundstage
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Introduction​


Kefine has been one of the more successful IEM makers of the last couple of years. I reviewed Delci and praised it for its lifelike timbre and enjoyable tuning. Klean is the latest release from Kefine that pulled down the price more while offering two different tuning nozzles. Coming at 49$, Klean looks like it offers a better value but does it really?

Disclaimers​


Kefine Klean was provided to me by Kefine for free. As I always say, everyone is biased one way or another, so take everything you read with a grain of salt. Additionally, I will try to be more concise and to the point in my reviews from now on, without worrying about word count. If you have any questions, please ask me in the comments, and I will try to answer them to the best of my abilities.

Packaging, Build and Accessories of Kefine Klean​


Klean comes in a smaller and more compact packaging than its bigger brothers, which isn’t exactly a downgrade since it comes with pretty much the same accessories. Carrying case this time is covered with fabric instead of faux leather. Cable that’s provided with the IEMs is again different but similar in thickness and behavior which is quite manageable. Only single ended termination is available but at this price it’s not really a con.

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3 pairs of generic eartips come out of the package as usual along with tuning filters for the nozzles. Interestingly nozzles aren't screwed out completely like other IEMs like Moondrop Kato, Kadenz or Simgot EA500, EA1000 and the like. Instead only filter parts can be removed and replaced, similar to AKG N5005. It might have reduced the costs and resulted in the very affordable price of Klean but only time will tell if it’s durable or not.

Earpieces themselves are made out of metal and stay comfortably in my ears. Shape is pretty much the same with the Delci however, probably due to the painting, Delci looked more premium as it should considering the price.

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Sound of Kefine Klean​


I used mostly the silver filters in my testing. Compared to the silver filters, the black filters sound more detailed but also leaner and more intense. The tonal balance that silver filters presented suited me more.

Tonality​


Klean has a slightly warm and pleasing tonality that somehow can still sound relatively clean so Klean name isn’t just there for the sake of it.

Bass on the Klean is elevated but not overbearing. In terms of the quality however, I can’t say it’s top notch. Maybe I’m spoiled with the bass of higher quality gear but couldn’t get the impact I got used to from Klean. Let’s say I have heard tighter, more impactful and satisfying bass in this price range and leave it at that.

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Klean’s mids sound pretty much on point. Overall slightly warm and pleasing. Probably trade-off at the bass improves clarity of mids so vocals sound clean, intimate yet not honky, shouty or overbearing. The balance struck here is exceptional.

Treble rendition of Klean safe to say the least. It doesn’t have any erratic peaks that would sound harsh or piercing but I can say there is a slight unevenness that can throw off the timbre occasionally. It might be because of the fit and others might not notice it but to my ears Klean doesn’t have the most even or smooth treble.

Technicalities​


Klean isn’t exactly an overachiever when it comes to technical ability. It has a moderate sound stage size. Resolving capability is also average for its price but imaging is surprisingly good. I couldn’t not only pinpoint the locations of the instruments but also I could almost tell their shapes and directions.

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Comparisons​


Kefine Klean vs. Kefine Delci​


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  • Delci has a little more impactful and rumbly bass. Klean’s bass is sloppy and boomy compared to that.
  • Delci is warmer in the lower mids, Klean sounds a little bit cleaner.
  • Klean is slightly tidier and more relaxed in the lower treble but more zingy in the upper treble.
  • Delci sounds more natural to my ears in terms of timbre however it fits more snugly in my ears which might be affecting my perception.
  • Delci is slightly more detailed but they aren’t really that far apart. Delci’s soundstage is wider and deeper, however imaging on Klean is somehow more precise.

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Kefine Klean vs. EPZ Q5 Pro​


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  • Q5 Pro has a better fit and comfort in my ears.
  • One doesn’t sound particularly bassier than the other however, Q5 Pro has a deeper, more tactile and satisfying bass. Klean’s bass sounds a little pillowy compared to Q5 Pro.
  • Both have slightly warm and rather forward mids but Q5 Pro sounds even more forward and shoutier.
  • Q5 Pro is brighter while Klean sounds more neutral and natural. While the Q5 Pro has a more elevated upper mids and treble, it still sounds smooth, probably because of the fit. It fits more snugly in my ears so treble peaks are pushed above the sibilance region (mostly between 6k and 8k).
  • Technically, the Q5 Pro is mostly superior to the Klean, It sounds more open, spacious and airy. Klean’s stage is rather moderate. Q5 Pro is also a more resolving pair of earphones. Klean sounds a little blunted compared to Q5 Pro. Imaging and layering however, feel more precise on Klean. I could almost feel the shapes of the objects even though they felt closer than I’m used to.

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Kefine Klean vs. RG15 (Analog)​


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  • RG15 sounds much warmer, thicker and has a boomier and more powerful bass. RG15 also extends deeper into the subbass. Klean, as the name suggests, sounds cleaner and more natural.
  • RG15 has an unapologetic V-Shaped tuning. Mids are recessed but upper mids and lower treble are elevated so it sounds a little shouty and borderline sibilant. Klean on the other hand sounds very natural and on point. It has a nice intimacy without getting honky, shouty or too personal.
  • Klean has just enough treble energy. Cymbals and hi-hat attacks are there but they lack some bite and splash that I like. RG15 might look too aggressive in the graphs when it comes to treble but it actually sounds pretty good. It really depends on the taste but overall Klean sounds more natural and safe while RG15 sounds brighter and more exciting.
  • RG15 has a more capable driver and it actually feels faster and more effortless however due to its tuning, masking is unavoidable therefore some details get lost in the mix. Klean reveals details more evenly. Klean also has a more lifelike timbre. Klean’s soundstage is slightly wider but RG15 has a much deeper soundstage. Klean’s imaging and layering capability also feels superior. In terms of technical capabilities, it’s a fight between superior tuning and better drivers.

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Conclusion​


Kefine has another winner in their hands. With a great metal build and comfortable fit at only 49$ it’s hard to find a fault really. It has an inoffensive pleasing tonality that goes with a wide variety of genres. For me it lacks the last bit of magic to be one of my top IEMs but I can still recommend it without hesitation. Looks like other reviewers liked it even more than me so check them out as well and if you are interested, some non-affiliated purchase links are below.

Amazon US:

https://www.amazon.com/dp/B0DK4WR4FJ/kefine+klean/

HiFiGo:

https://hifigo.com/products/kefine-klean

Aliexpress:

Hifigo: https://www.aliexpress.com/item/3256807735705434.html

Kefine: https://www.aliexpress.com/store/1103187464/pages/all-items.html
Khalid Kabbo
Khalid Kabbo
Good work brother 👌
Ceeluh7
Ceeluh7
Nice work Fahry
J
Jarlaxle
thanks friends

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