Wired IEMs
Letshuoer S12 Ultra
83Outstanding
$170
Full review dataLetshuoer S12 Ultra vs Thieaudio Legacy 4: which should you buy?
Specs, scores and condensed review verdicts for the Letshuoer S12 Ultra vs Thieaudio Legacy 4, side by side. Where a product has no HearWiki score yet, not enough reviews have been aggregated to rate it.
Wired IEMs
Thieaudio Legacy 4
Not yet scored
$200
Full review dataScore 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.
- Letshuoer S12 Ultra
- Thieaudio Legacy 4
HearWiki score
83
-
Sound
8.6
-
Value
8.9
-
Price (USD)
$170
$200
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 5 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 5 years between them, that is a thin return - treat this as a restyle rather than a new platform.
- S12 Ultra20255 yr newer
- Legacy 42020
Specifications
S12 UltraLegacy 4
- Type
- Wired IEMs
- Wired IEMs
- Price (USD)
- $170
- $200
- HearWiki score
- 83
- Not scored
- Released
- 2025
- 2020
- Availability
- Sold new
- Discontinued
- Driver
- 1 planar magnetic
- hybrid
- Driver type
- planar
- hybrid
- Driver configuration
- 1 planar magnetic
- -
- Driver size
- 14.8 mm
- 8 mm
- Drivers per side
- 1
- -
- Impedance
- 16 Ω
- -
- Connector
- -
- 3.5 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
Thieaudio Legacy 4
The Thieaudio Legacy 4 is a wired in-ear monitor that blends an 8mm dynamic driver for low-end punch with balanced-armature drivers for detailed mids and highs. This hybrid configuration targets listeners who want a more analytical yet musical sound, from casual audiophiles to working musicians. Its compact design and standard 3.5mm connection make it a straightforward choice for portable use without extra features like noise cancellation.
- Pro:Hybrid driver setup delivers solid bass and clear treble
- Pro:Comfortable fit for long listening sessions
- Pro:Wired connection ensures stable, lossless audio
- Con:No noise isolation or cancellation features
- Con:Requires a separate amplifier for best performance
- Con:May not suit those who prefer a fully neutral sound
Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.
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