IKKO Obsidian OH10 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 4 of 4 measures.

IKKO Obsidian OH10
Letshuoer S12 Ultra

HearWiki score

Sound

7.8

8.6

Value

5.8

8.9

Price (USD)

$200

$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 6 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. For 6 years between them, that is a thin return - treat this as a restyle rather than a new platform.

Obsidian OH102019
S12 Ultra20256 yr newer

Specifications

Obsidian OH10S12 Ultra

Type: Wired IEMs; Wired IEMs
Price (USD): $200; $170
HearWiki score: 66; 83
Released: 2019; 2025
Availability: Discontinued; Sold new
Driver: hybrid; 1 planar magnetic
Driver type: hybrid; planar
Driver configuration: -; 1 planar magnetic
Driver size: 10 mm; 14.8 mm
Drivers per side: -; 1
Impedance: 18 Ω; 16 Ω
Sensitivity: 106 dB/mW; -
Weight: 16.2 g; -
Connector: 2-pin 0.78 mm; -

Specification comparison of IKKO Obsidian OH10 vs Letshuoer S12 Ultra
Spec	IKKO Obsidian OH10	Letshuoer S12 Ultra
Type	Wired IEMs	Wired IEMs
Price (USD)	$200	$170
HearWiki score	66 / 100 Good	83 / 100 Outstanding
Released	2019	2025
Audio
Driver	hybrid	1 planar magnetic
Driver type	hybrid	planar
Driver configuration	-	1 planar magnetic
Driver size	10 mm	14.8 mm
Drivers per side	-	1
Impedance	18 Ω	16 Ω
Sensitivity	106 dB/mW	-
Design
Weight	16.2 g	-
Connector	2-pin 0.78 mm	-

What reviewers said

IKKO Obsidian OH10

The IKKO Obsidian OH10 is a hybrid in-ear monitor that delivers a bold, bass-rich sound with a fun and engaging character, making it an excellent pick for fans of energetic genres. It pairs a solid metal build with an easy-to-drive design, offering accessible performance that prioritizes musical enjoyment over clinical accuracy.

Pro:Punchy, well-controlled bass response
Pro:Easy to drive with any source
Pro:Robust and premium-feeling build

Con:Sound signature not for purists seeking neutrality
Con:No noise isolation features
Con:May feel heavy for some listeners

Letshuoer S12 Ultra

The Letshuoer S12 Ultra is a wired in-ear monitor built around a single 14.8mm planar magnetic driver housed in a lightweight aluminum shell. It delivers the signature planar sound of the S12 line—fast, detailed, and punchy—in a refreshed design aimed at hi-fi enthusiasts. With a low 16-ohm impedance, it pairs easily with most sources, though it lacks any active noise cancellation.

Pro:Fast, detailed planar sound with strong dynamics
Pro:Lightweight and sturdy aluminum-alloy build
Pro:Easy to drive thanks to low impedance

Con:No noise cancellation or isolation features
Con:Planar timbre may not suit all listeners
Con:Cable and accessories are basic for the price

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 IKKO Obsidian OH10 Letshuoer S12 Ultra