Final F3100 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.

Final F3100
Letshuoer S12 Ultra

HearWiki score

Sound

5.8

8.6

Value

3.0

8.9

Price (USD)

$130

$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 4 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 4 years between them, that is a thin return - treat this as a restyle rather than a new platform.

F31002021
S12 Ultra20254 yr newer

Specifications

F3100S12 Ultra

Type: Wired IEMs; Wired IEMs
Price (USD): $130; $170
HearWiki score: 46; 83
Released: 2021; 2025
Availability: Discontinued; Sold new
Driver: balanced armature; 1 planar magnetic
Driver type: balanced-armature; planar
Driver configuration: -; 1 planar magnetic
Driver size: -; 14.8 mm
Drivers per side: 1; 1
Frequency response: 10 Hz - 39.8 kHz; -
Impedance: 42 Ω; 16 Ω
Sensitivity: 106 dB/mW; -
Active noise cancelling: No; -
Weight: 10 g; -
Detachable cable: No; -
Model code: FI-F3BAL; -

Specification comparison of Final F3100 vs Letshuoer S12 Ultra
Spec	Final F3100	Letshuoer S12 Ultra
Type	Wired IEMs	Wired IEMs
Price (USD)	$130	$170
HearWiki score	46 / 100 Weak	83 / 100 Outstanding
Released	2021	2025
Audio
Driver	balanced armature	1 planar magnetic
Driver type	balanced-armature	planar
Driver configuration	-	1 planar magnetic
Driver size	-	14.8 mm
Drivers per side	1	1
Frequency response	10 Hz - 39.8 kHz	-
Impedance	42 Ω	16 Ω
Sensitivity	106 dB/mW	-
Features
Active noise cancelling	No	-
Design
Weight	10 g	-
Detachable cable	No	-
Model code	FI-F3BAL	-

What reviewers said

Final F3100

The Final F3100 is a tiny, wired single balanced-armature IEM that delivers a clean, neutral, and highly detailed sound with a compact, durable design. It excels at vocal clarity and lively highs, making it a strong pick for pop and rock, though its single-driver setup limits low-end punch and extreme treble air. Weighing just 10 grams, it offers an easy-listening, comfortable fit for critical listeners on a budget.

Pro:Very lightweight and compact build
Pro:Clear, neutral, and detailed sound signature
Pro:Strong vocal clarity and non-fatiguing highs

Con:Limited bass weight and can distort at high volumes
Con:Treble lacks sparkle or extended air
Con:Non-detachable cable reduces long-term flexibility

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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