Letshuoer S12 Ultra – 14.8mm Planar Driver IEM

A Refined Evolution of the S12 Series

The Letshuoer S12 Ultra elevates the iconic S12 DNA with a more advanced 14.8mm planar driver, re-engineered housing, and upgraded cable architecture—all designed to deliver a smoother, more resolving, and truly immersive Hi-Fi listening experience.

Driver Evolution: Next-Level Planar Precision

At the heart of the S12 Ultra lies its meticulously tuned 14.8mm planar magnetic driver, refined through strict quality control and structural enhancements.
Expect:

• Extended treble with natural air

• Enhanced micro-detail retrieval

• Improved driver consistency for cleaner, more effortless sound

This optimisation unlocks the full potential of planar IEMs—fast, textured bass, clean mids, and airy highs.

Design Evolution: Classic Aesthetic, Modern Engineering

The S12 Ultra embraces the classic S12 industrial design while introducing a re-engineered connector housing for improved durability and visual harmony.
The updated aluminium alloy chassis features refined surface finishing for a cohesive, premium look that stands out while staying true to the S12 design language.

Sound Quality Evolution: Richly Layered & Balanced

With deep driver customisation, the S12 Ultra delivers a sound signature that is:

• Natural and transparent

• Smooth yet detailed in the highs

• Richly layered in the mids

• Controlled and textured in the low end

The result is a timeless, balanced Hi-Fi experience suitable for critical listening, casual enjoyment, and professional monitoring.

Cable Evolution: Cleaner Signal, Better Performance

Equipped with a 392-core silver-plated copper cable, the S12 Ultra ensures:

• Excellent conductivity

• Lower signal loss

• Strong anti-interference performance

The 0.78mm 2-pin interface also ensures wide cable compatibility for future upgrades.

Interchangeable Plugs & Mobile-Ready DAC

For maximum versatility, the package includes:

• 3.5mm & 4.4mm interchangeable plugs

• DT01 Pro 3.5mm to Type-C DAC amplifier cable

This makes the S12 Ultra instantly compatible with phones, DAPs, dongle DACs, and amplifiers—offering purer transmission and stable connectivity wherever you listen.

Specifications

Model: Letshuoer S12 Ultra Wired In-Ear Monitor
Driver: 14.8mm Planar Magnetic Driver
Sensitivity: 101dB
Impedance: 16Ω
Frequency Response: 20Hz – 40kHz
Chassis Material: Aluminium Alloy
Cable: 1.2m Silver-Plated Copper (392-core)
Connector: 0.78mm 2-Pin
Plugs Included: 3.5mm & 4.4mm interchangeable

Inside the Box

• S12 Ultra IEM Units × 2

• Earphone Cable × 1

• Interchangeable 3.5mm & 4.4mm Plugs × 1

• Ear Tips × 6 pairs

• DT01 Pro 3.5mm to Type-C DAC Amplifier Cable × 1

• Carrying Case × 1

• User Manual × 1

• Warranty Card × 1