ThieAudio Monarch MKIV IEM

ThieAudio Monarch MKIV – Flagship IEM with Dual Tuning and EST Drivers

Dual Sonic Identities. Premium Craftsmanship. Unmatched Detail.

The ThieAudio Monarch MKIV redefines flagship-level performance by merging reference-grade precision with dynamic, hard-hitting bass. Equipped with the new dual tuning switch, users can effortlessly toggle between two distinct sound signatures—STANDARD for studio-accurate clarity or RUMBLE for a deeper, bass-enhanced experience.

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Key Features

🎚️ Customizable Dual Tuning Modes

Switch on the fly between:

• STANDARD Mode – Neutral, analytical tuning with clean mids and natural treble.

• RUMBLE Mode – +3dB sub-bass boost with richer low-mids for bassheads and immersive listening.

🔊 IMPACT² Dual Subwoofer System

Two 8mm dynamic drivers in an isobaric chamber deliver clean, textured, and thunderous sub-bass. The result is deep impact and speed without compromising the overall balance.

🛠️ T6 Aircraft-Grade Aluminum Shell

Precision CNC-machined aluminum housing offers a lightweight yet durable build. Surface-hardened for resistance against scratches and sweat, ensuring both ruggedness and comfort.

✨ Refined Electrostatic Treble

Advanced Sonion EST drivers extend treble response up to 40kHz. Redesigned crossover networks enable seamless transitions and enhance spatial imaging, clarity, and air.

🧠 Next-Gen 4-Way Crossover Design

Monarch MKIV integrates 9 passive crossover components with 4 independent sound tubes for meticulous frequency control—offering both accuracy and musicality.

🎧 Chocolate Modular Cable

Bundled with a premium 8-core silver-plated OFC and pure OFC hybrid cable. The modular plug system supports both 3.5mm and 4.4mm connections, making it compatible with a wide range of sources.

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Tuning Breakdown

STANDARD Mode:

• 10dB sub-bass with 150Hz cutoff ensures fast bass and clean midrange.

• Neutral midrange tuning (150Hz–1kHz) and smoothed treble for refined clarity.

• Focus on vocal clarity and realistic instrument reproduction.

RUMBLE Mode:

• Enhanced sub-bass at 13dB.

• Boosted 200Hz–500Hz region adds warmth and richness to male vocals, bass guitars, and foundational notes.

• Ideal for those seeking fuller, engaging sound with body and depth.

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Technical Specifications

• Driver Configuration: 2 DD (8mm) + 6 BA + 2 EST (Sonion E50) + 1 Sonion 28UAP

• Crossover: 4-way with 4 sound tubes

• Frequency Response: 10Hz – 44kHz

• Impedance: 10/9Ω ±1Ω @1kHz

• Sensitivity: 100dB ±1dB @1kHz

• THD: <1% @1kHz

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Inside the Box

• THIEAUDIO Monarch MKIV IEMs

• Premium Chocolate Modular Cable

• 3 Pairs of THIEAUDIO Eartips (S/M/L)

• Cable Tie, Cleaning Cloth

• User Manual & Warranty Card

• Monarch MKIV Stickers ×2

• Thank You Card

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Why Choose THIEAUDIO?

THIEAUDIO has become a global reference in the audiophile space, known for top-tier tunings and performance-driven design at accessible pricing. Backed by a dedicated international engineering team, the brand continues to push boundaries with innovations like the Monarch MKIV—crafted to satisfy both purists and enthusiasts alike.