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Etymotic MK5 Isolator Earphones 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.

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.

  • Etymotic MK5 Isolator Earphones
  • Letshuoer S12 Ultra
HearWiki score
62
83
Sound
6.7
8.6
Value
6.0
8.9
Price (USD)
$100
$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

Etymotic MK5 Isolator Earphones (2026) against Letshuoer S12 Ultra (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.

  • MK5 Isolator Earphones20261 yr newer
  • S12 Ultra2025

Specifications

MK5 Isolator EarphonesS12 Ultra
Type
Wired IEMs
Wired IEMs
Price (USD)
$100
$170
HearWiki score
62
83
Released
2026
2025
Availability
Sold new
Sold new
Driver
6 mm dynamic
1 planar magnetic
Driver type
dynamic
planar
Driver configuration
-
1 planar magnetic
Driver size
6 mm
14.8 mm
Drivers per side
1
1
Impedance
32 Ω
16 Ω
Sensitivity
95 dB/mW
-
Active noise cancelling
No
-
Weight
122.5 g
-
Detachable cable
No
-
Connector
3.5 mm
-

What reviewers said

Etymotic MK5 Isolator Earphones

The Etymotic MK5 Isolator Earphones are a wired, budget-friendly in-ear option that delivers a neutral sound signature with impressive passive noise blocking for the price. They prioritize clarity and detail, making them a solid pick for listeners who value isolation and accurate reproduction over bass-heavy or flashy tuning.

  • Pro:Excellent passive isolation for the price
  • Pro:Neutral, detailed sound presentation
  • Pro:Competitive value in its budget range
  • Con:Tuning can lean bright for some tastes
  • Con:Fit may be uncomfortable for certain ears
  • Con:Limited bass and treble extension

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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New comparisonEtymotic MK5 Isolator EarphonesLetshuoer S12 Ultra