7Hz Timeless II 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.

Wired IEMs

Score 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.

7Hz Timeless II
Letshuoer S12 Ultra

HearWiki score

Sound

8.4

8.6

Value

8.1

8.9

Price (USD)

$230

$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

Letshuoer S12 Ultra (2025) against 7Hz Timeless II (2024). 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.

Timeless II2024
S12 Ultra20251 yr newer

Specifications

Timeless IIS12 Ultra

Type: Wired IEMs; Wired IEMs
Price (USD): $230; $170
HearWiki score: 77; 83
Released: 2024; 2025
Availability: Discontinued; Sold new
Driver: 14.5 mm planar magnetic; 1 planar magnetic
Driver type: planar; planar
Driver configuration: -; 1 planar magnetic
Driver size: 14.5 mm; 14.8 mm
Drivers per side: -; 1
Impedance: 15.2 Ω; 16 Ω
Detachable cable: Yes; -
Connector: 2-pin 0.78 mm; -

Specification comparison of 7Hz Timeless II vs Letshuoer S12 Ultra
Spec	7Hz Timeless II	Letshuoer S12 Ultra
Type	Wired IEMs	Wired IEMs
Price (USD)	$230	$170
HearWiki score	77 / 100 Great	83 / 100 Outstanding
Released	2024	2025
Audio
Driver	14.5 mm planar magnetic	1 planar magnetic
Driver type	planar	planar
Driver configuration	-	1 planar magnetic
Driver size	14.5 mm	14.8 mm
Drivers per side	-	1
Impedance	15.2 Ω	16 Ω
Design
Detachable cable	Yes	-
Connector	2-pin 0.78 mm	-

What reviewers said

7Hz Timeless II

This wired planar magnetic IEM features a 14.5 mm dual-sided coated diaphragm and a tunable nozzle system that lets you adjust high-frequency response to taste. It's designed for listeners seeking the technical speed and detail of planar drivers with the flexibility to shape the treble. With a detachable 2-pin cable and low 15.2-ohm impedance, it's easy to drive from most sources.

Pro:Fast, detailed planar driver response
Pro:User-adjustable treble via swappable nozzles
Pro:Detachable 0.78 mm 2-pin cable

Con:No active noise cancellation
Con:Requires source with low output impedance for optimal sound
Con:Tuning nozzles may be easy to lose

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

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 comparison 7Hz Timeless II Letshuoer S12 Ultra