Wired IEMs
Letshuoer S12 Ultra
83Outstanding
$170
Full review dataLetshuoer S12 Ultra vs NF ACOUS NA20: 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 NA20
78Great
$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 NA20
HearWiki score
83
78
Sound
8.6
8.0
Value
8.9
8.2
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
Both shipped in 2025. 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 Ultra2025
- NA202025
Specifications
S12 UltraNA20
- Type
- Wired IEMs
- Wired IEMs
- Price (USD)
- $170
- $120
- HearWiki score
- 83
- 78
- Released
- 2025
- 2025
- Availability
- Sold new
- 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
- -
- 109 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 NA20
The NF ACOUS NA20 is a wired IEM designed for music enthusiasts, featuring a dynamic driver with a beryllium-plated diaphragm. It prioritizes a comfortable, natural sound that suits extended listening or mixing work, offering a straightforward analog experience without active noise cancellation.
- Pro:Beryllium-plated dynamic driver for detailed sound
- Pro:Comfortable fit for long sessions
- Pro:Wired 2-pin connection for reliable audio
- Con:No active noise cancellation
- Con:Wired only, limiting portability
Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.
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