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Letshuoer S12 Ultra vs Whizzer Haydn A15 Pro: which should you buy?

Specs, scores and condensed review verdicts for the Letshuoer S12 Ultra vs Whizzer Haydn A15 Pro, side by side. Where a product has no HearWiki score yet, not enough reviews have been aggregated to rate it.

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.

  • Letshuoer S12 Ultra
  • Whizzer Haydn A15 Pro
HearWiki score
83
-
Sound
8.6
-
Value
8.9
-
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

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
  • Haydn A15 Pro2020

Specifications

S12 UltraHaydn A15 Pro
Type
Wired IEMs
Wired IEMs
Price (USD)
$170
$120
HearWiki score
83
Not scored
Released
2025
2020
Availability
Sold new
Discontinued
Driver
1 planar magnetic
10 mm dynamic
Driver type
planar
dynamic
Driver configuration
1 planar magnetic
-
Driver size
14.8 mm
10 mm
Drivers per side
1
1
Frequency response
-
20 Hz - 40 kHz
Impedance
16 Ω
16 Ω
Sensitivity
-
98 dB/mW
Active noise cancelling
-
No
Controls
-
buttons
Weight
-
8 g
Detachable cable
-
Yes
USB-C
-
No

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

Whizzer Haydn A15 Pro

The Whizzer Haydn A15 Pro is a wired in-ear monitor built around a single 10mm dynamic driver, delivering a wide frequency range from 20 Hz to 40 kHz. It comes with a detachable Y-type MMCX cable terminating in a 3.5mm plug, and offers onboard button controls for easy playback management. With a lightweight 8-gram build and 16-ohm impedance, it's designed for straightforward, high-sensitivity listening without active noise cancellation.

  • Pro:Lightweight 8g design for comfortable wear
  • Pro:Detachable MMCX cable allows easy upgrades
  • Pro:Wide frequency response up to 40 kHz
  • Con:No active noise cancellation
  • Con:Wired only, no USB-C connectivity
  • Con:Single dynamic driver may lack multi-driver detail

Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.

Compare something else

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New comparisonLetshuoer S12 UltraWhizzer Haydn A15 Pro