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 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
NF ACOUS NA20
This wired IEM features a dynamic driver with a beryllium-coated diaphragm, designed for immersive music listening and extended sessions. It prioritizes a natural, engaging sound signature over technical extras, making it a straightforward choice for those who value comfort and musicality. With a high sensitivity and standard 2-pin connector, it pairs easily with a wide range of sources.
- Pro:Warm, musical tuning ideal for long listening
- Pro:Efficient driver works well with most devices
- Pro:Comfortable fit for extended use
- Con:No noise isolation or cancellation features
- Con:Requires a wired source, no Bluetooth option
- Con:Beryllium coating may not suit all tonal preferences
Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.
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