Wired IEMs
Letshuoer S12 Ultra
83Outstanding
$170
Full review dataLetshuoer S12 Ultra vs NF ACOUS NM20: 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
NF ACOUS NM20
60Average
$120
Full review dataScore 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.
- Letshuoer S12 Ultra
- NF ACOUS NM20
HearWiki score
83
60
Sound
8.6
6.1
Value
8.9
5.8
Price (USD)
$170
$120
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
Letshuoer S12 Ultra (2025) against NF ACOUS NM20 (2024). These are 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.
- S12 Ultra20251 yr newer
- NM202024
Specifications
S12 UltraNM20
- Type
- Wired IEMs
- Wired IEMs
- Price (USD)
- $170
- $120
- HearWiki score
- 83
- 60
- Released
- 2025
- 2024
- Availability
- Sold new
- Still sold new
- Driver
- 1 planar magnetic
- dynamic
- Driver type
- planar
- dynamic
- Driver configuration
- 1 planar magnetic
- -
- Driver size
- 14.8 mm
- -
- Drivers per side
- 1
- -
- Impedance
- 16 Ω
- -
- Sensitivity
- -
- 108 dB/mW
- Connector
- -
- 2-pin 0.78 mm
What reviewers said
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
NF ACOUS NM20
The NF ACOUS NM20 is a wired, dynamic-driver in-ear monitor designed as an updated second-generation model for studio and stage use. It features the MC2L-100P driver and Clutter Trap acoustic system to enhance clarity and monitoring accuracy. Priced around $119, it offers a straightforward, no-frills wired experience with a 2-pin connector and high sensitivity.
- Pro:High sensitivity (108 dB) for easy driving
- Pro:Dynamic driver with specialized acoustic system
- Pro:Suitable for both studio and live monitoring
- Con:No active noise cancellation
- Con:Wired only, limiting portability
- Con:May require a good source for optimal performance
Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.
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