Kefine Klanar vs Letshuoer S12 Ultra: which should you buy?

On aggregated review scores the Letshuoer S12 Ultra comes out ahead with a HearWiki score of 83. The full breakdown - sub-scores, specs and what reviewers actually said - is below.

Our pick: Letshuoer S12 Ultra - Outstanding overall at around $169.

Wired IEMs

Score breakdown

Each axis is a 0–10 blend of what reviewers scored, not a lab measurement.

Letshuoer S12 Ultra leads on 3 of 4 measures.

Kefine Klanar
Letshuoer S12 Ultra

HearWiki score

Sound

7.3

8.6

Value

6.0

8.9

Price (USD)

$120

$170

Generation & platform

The scores rank quality. This is the other question: is the newer one actually newer technology, or the same platform in a new shell?

Same generation

The Letshuoer S12 Ultra is 2 years newer, but it is the same generation of hardware: nothing in the radio, the codecs or the noise cancelling separates them. Nothing separates them on convenience features either, so the choice comes down to tuning and price.

Klanar2023
S12 Ultra20252 yr newer

Specifications

KlanarS12 Ultra

Type: Wired IEMs; Wired IEMs
Price (USD): $120; $170
HearWiki score: 71; 83
Released: 2023; 2025
Availability: Still sold new; Sold new
Driver: 14.5 mm planar magnetic; 1 planar magnetic
Driver type: planar; planar
Driver configuration: -; 1 planar magnetic
Driver size: 14.5 mm; 14.8 mm
Drivers per side: -; 1
Impedance: 16 Ω; 16 Ω
Weight: 12.6 g; -

Specification comparison of Kefine Klanar vs Letshuoer S12 Ultra
Spec	Kefine Klanar	Letshuoer S12 Ultra
Type	Wired IEMs	Wired IEMs
Price (USD)	$120	$170
HearWiki score	71 / 100 Good	83 / 100 Outstanding
Released	2023	2025
Audio
Driver	14.5 mm planar magnetic	1 planar magnetic
Driver type	planar	planar
Driver configuration	-	1 planar magnetic
Driver size	14.5 mm	14.8 mm
Drivers per side	-	1
Impedance	16 Ω	16 Ω
Design
Weight	12.6 g	-

What reviewers said

Kefine Klanar

The Kefine Klanar is a budget-friendly planar IEM with a 14.5mm driver, delivering a wide soundstage, robust bass, and clear treble in a lightweight, easy-to-drive design. It offers impressive tonal balance and technical performance for its price, though its vocal presence can feel recessed and it requires careful source pairing to avoid excessive brightness at high volumes.

Pro:Excellent planar bass response
Pro:Wide soundstage with good imaging
Pro:Lightweight and comfortable fit

Con:Vocals can sound recessed
Con:Average passive isolation
Con:May become harsh at higher volumes

Letshuoer S12 Ultra

The Letshuoer S12 Ultra is a wired in-ear monitor that delivers Hi-Fi sound through a single 14.8mm planar magnetic driver housed in a lightweight aluminum-alloy shell. Aimed at music enthusiasts, it offers the signature planar-driver clarity and detail of the S12 series in a refreshed design, without any active noise cancellation or wireless features. Priced around $169, it's a straightforward, high-performance option for wired listening.

Pro:Detailed and fast planar magnetic sound
Pro:Lightweight and durable aluminum-alloy build
Pro:Accurate bass response with low distortion

Con:Requires a wired connection, no wireless freedom
Con:No active noise cancellation for noisy environments
Con:Open-back style may leak sound in quiet settings

Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.

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New comparison Kefine Klanar Letshuoer S12 Ultra