First, a big shoutout to **Collin Yang** and **Lina Pan** from **Kefine** for giving me this IEM. Nobody is giving me money or a script to follow, I’m free to give it my sincere opinions and impressions. The only bias at play are my tuning and musical preferences.

The **Kefine Klean SV** is an affordable IEM, driven by a **10 mm DLC Diaphragm Dynamic Driver**, according to **Kefine** themselves it’s a 2nd generation driver, who uses a familiar shell used previously on a legendary budget king earphone, the **Kefine Klean** original.

Priced at an **MSRP of 54 – 56 USD** (with options for 3.5 mm, 4.4 mm, or USB-C cables), the **Kefine Klean SV** proves that a set designed essentially for musical enjoyment and critical listening doesn’t have to come at a high cost.

**You can find it at Linsoul:** [**https://www.linsoul.com/products/kefine-klean**](https://www.linsoul.com/products/kefine-klean)**, HiFiGO:** [**https://hifigo.com/products/kefine-klean-sv**](https://hifigo.com/products/kefine-klean-sv)**, Angelears:** [**https://aehifi.com/products/kefine-klean-sv**](https://aehifi.com/products/kefine-klean-sv)**. Also available in the official Linsoul, HiFiGO, Angelears and Kefine stores at AliExpress, Shopee, and other retailers online.**

The **Kefine Klean SV** is a more than interesting IEM, it’s cleaner and brighter, with plenty of quality bass to balance the sound, with a neutral and warm tonality yet technically remarkable, bring by **Kefine** to offer a fun and appealing sound to experienced audiophiles and newcomers to the hobby for an affordable price.

**Technical specifications:**

* Driver Type: 10 mm DLC Diaphragm Dynamic Driver.
* Frequency Response: 20 Hz - 20 kHz.
* Sensitivity: 107 ± 3 dB.
* Process Materials: CNC-machined metallic alloy.
* Impedance: 32 Ω ± 15 %.
* Jack connector: SE 3.5 mm, 4.4 balanced, USB-C.
* Connection Type: 2 Pin 0.78 mm.
* Cable materials: 2 cores, silver-plated copper wire.
* Cable length: 1.2m ± 0.2 m.
* Weight: 10 g per side.

**What comes in its package?**

* Earphone x 2
* 0.78mm 2 pin 6N Cable
* 2 pairs of Interchangeable tuning nozzles (black and gold, the silver ones are installed on the earphones)
* 6 pairs of Silicone balanced bore eartips (Black/White and Gray in LMS sizes)
* 1 x User Manual
* 1 x Quality certificate
* 1 x Storage Box

Its cable looks very nice and well-built, is tight and sturdy, but I personally think it is kind of thin. It tangles easily but not produces translated vibrations. It matches nicely with the shells and has 2 pin connectors, so, if you got the opportunity to change the cable, you can do it.

The shells are made of CNC-machined metallic alloy with a simple yet beautiful faceplate with the **Kefine** logo in black letters. It’s well-constructed, the housing doesn’t seem prompt to micro scratches and fingerprints, so, **for 54 USD** you are expecting a quality product to last. It is comfortable to wear for long periods of time, with a silver nozzle installed and two other options more that fits well in my ears (6 mm diameter), but check if it fits you.

**How the Kefine Klean SV sounds:**

The **Kefine Klean SV** with its **10 mm DLC diaphragm dynamic driver** configuration offers a very transparent, with enough bass, and neutral yet bright sound, with a good **mild V-shaped** tuning.

A nice subbass boost and midbass presence with a nice extension into the lower and high frequencies; and a technical capacity who competes hand-to-hand with sets in the same segment of price and sometimes punches above its weight, offering a neutral, bright but not so spicy and full of macro and microdetails IEM who offers an immersive, musical and analytical presentation of sound.

For this review, I used the **white/black eartips** included in its M size, finding the best synergy in comfort, fit and seal. The **stock cable** is fine as it is, I’m using the 4.4 mm cable they gave me, I don’t see the need to change it for this review. About the tuning nozzles I’m using, according to my tuning tastes the **silver nozzles** already installed on the set, I tried the **black** ones not liking its lack of detailing, and the **gold** ones, I find too bright and fatiguing for me.

**Kefine** gave me their new **KA1 dongle** to test the set, you can buy it at AliExpress. It has a CX31993 chip and a warm/neutral firm. The graph is taken from **Ducbloke** who graphed the 3 tuning nozzles.

**BASS:**   
  
The **Kefine Klean SV** offers a very decent bass shelf, with a good amount and high quality of subbass thump and midbass bump. It is transparent, very fast, correctly resolving, well extended into the lower frequencies, with outstanding impact and a natural decay. This time the midbass bleeds so slightly into the lower mids without mudding the male vocals.

In songs like **“N2 Gether Now (feat. Method Man)”** by **Limp Bizkit,** with the **Klean SV** you can feel the weight of the bass drops, the bass guitar and drum kicks in a good quantity and impact. In **“Purity”** by **Slipknot**, the **Klean SV** shows how those bass kicks and the excellent drumming by Joey Jordison is so well delivered, giving weight and presence to this classic nu-metal hit.

**MIDS:** 

As I mentioned before, in the **Klean SV** the midbass bleeds a bit into the lower mids but male vocals and bass kick are not muddy, neither veiled. It is presented with enough note weight.

The mids have a dip going until 800 Hz then it is forwarded and enters a warm and smooth pinna gain with a remarkable transparency and resolution, with a 3 kHz and 5 kHz peaks to add to the feel of those drums, guitars and keyboards, female vocals are forwarded as well, not so shouty.

In songs like **“Over the Middle”** by **Forbidden** you can see how the **Klean SV** delivers an impressive display of clarity and details to the mix; the thrash metal legends shines with it. In **“These Nights”** by **Cannons**, the female fronted dream pop band transports you in a journey of emotions, the **Klean SV** delivers the music with excellence, nice song btw.

**TREBLE:** 

In this segment of frequencies, the **Klean SV** is very clean, crisp and sharp without too much harshness, handling the sibilance nicely, complemented with a nice 10 kHz dip to use the IEM at mid to high volumes, but this is not a high-volume set, it tends to be spicy and fatiguing.

In songs like **“Falling Down”** by **Atreyu**, is shown all the drums and guitars details and colorations in the production of the track, no frequency overcomes another one. In **“Holy, Holy”** by **Geordie Greep** you can just put the **Klean SV** in your ears, the full of nuances and so catchy song is delivered almost perfectly.

**TECHNICAL CAPACITY:**

The upper treble in the **Kefine Klean SV** extends nicely, presenting an airy but not so expansive sound, the soundstage is expansive, and it gives you a nice sensation of space and depth. The imaging is average for its price; good layering of instruments and resolution tends to be at pair with its peers.

In songs like **“Hotel California (Live on MTV, 1994)”** live version of the song found on the **Hell Freezes Over** album by **The Eagles**, you can feel inside the scenario in which they recorded the music, jamming the busy and groovy classic in all its greatness.

With complex and busy tracks like **“Long Live the Misanthrope”** by **Soilwork** in their **Live in the Heart of Helsinki** album, you can be sure to hear all its microdetails and instruments in the song just to headbang to the music and feel the live gig.

**Comparisons:**

**Kefine Klean SV vs. Kefine Klean og:**

In this case, the **Klean og** has a more bassy and warmer sound, so, less dry and brighter than the **Klean SV**. Another thing with the **Klean og** it’s than it’s more an all-rounder and so less fatiguing in long sessions than its twin brother, so in this case I prefer the **Klean og,** it definitely conserves its legendary character as my favorite IEM under 50 USD**.**

**Kefine Klean SV vs. Inawaken Dawn ms:**  
  
The **Inawaken Dawn ms** is the direct competitor to the **Klean og:** it got more bass, and it is even warmer than the last. In comparison, the **Klean SV** you got a more analytical/technical than musical approach, it is more technically proficient (better soundstage, imaging and layering of instruments). It’s a thing of preference and in this case, I’m preferring the **Inawaken Dawn ms** more organic and musical tuning over the **Klean SV.**

**Kefine Klean SV vs. TINHiFi C3 MKII:**

The **TINHiFi C3 MKII** is a similarly priced IEM and another direct competitor to the **Klean SV**, with a more balanced approach and perhaps less subbass extension than the **Klean SV**, but has more midbass to compensate that brighter and spicier tuning that the **Klean SV** has, so, I like the **Klean SV** a lot, but in this case, the tuning of the **C3 MKII** is more enjoyable for me, no matter its less analytical character.

**Closing thoughts and conclusions:**

The **Kefine Klean SV** stands out as an interesting offering and one of the best options to buy in the **under 60 USD** segment, its quality bass delivery balancing that naturalness and brightness, and its added technical capacities put it as a complement rather than a upgrade to the **Klean og,** making it ideal for seasoned audiophiles and trebleheads who want a very high-quality audio experience at an affordable cost.

The **Klean SV** with its 107 dB sensitivity and 32 ohms of impedance is easy to drive, even with a low powered source, but my advice goes to try with source interchanging to it to scale. With a warm/neutral source like the **Kefine KA1** it is added that very desirable warmth to use it for longer sessions, and with a neutral source it doesn’t lack bass, but it is more analytical than musical (sources with CX43131 chips for example).

**Can I recommend it?** It depends if you like riding close to the sun with that neutral bright tuning! The **Kefine Klean SV** is more a sidegrade than an upgrade to the **Klean og,** yet it is one good option for its price segment and offers a mesmerizing sound, with the **Kefine** seal of quality, it is now in my collection, and I’m not giving it away soon.

Again, thanks to **Collin Yang** and **Lina Pan** from **Kefine** for giving me this IEM, to testing it, enjoying it and giving me the reasons I needed to recommend it. Thank you, the reader, for visiting my review, **and happy listening!**

Kefine Klean SV: The lost and found twin of the legend, a legend by itself?