MOONDROP Harmon XTM-3DD IEM

MOONDROP Harmon IEM – Triple Dynamic Driver Precision with Acoustic Crossover Excellence

Experience next-level audiophile sound with the MOONDROP Harmon, a meticulously engineered triple dynamic driver IEM featuring Moondrop’s proprietary acoustic crossover system. Designed for precision, clarity, and rich tonal depth, Harmon integrates three full-size 10mm dynamic drivers—two dedicated to low frequencies and one for mid-treble—each housed in its own resonant acoustic chamber for superior phase alignment and low distortion performance.

True Triple Dynamic Architecture

Unlike hybrid IEMs that combine different driver types, the Harmon focuses purely on high-performance dynamic drivers. Two bass drivers are mounted in a horizontally opposed configuration to eliminate unwanted mechanical vibrations while delivering deep, punchy, and tightly controlled bass. A specialized mid-treble driver, featuring a 1μm-thin glass dome diaphragm, ensures extended treble response, accurate imaging, and natural tonality—without harshness or fatigue.

Advanced Four-Cavity Acoustic Crossover

At the core of the Harmon lies a patented four-cavity coaxial crossover system, which relies on precise acoustic filtering rather than heavy-handed electronics. This approach guarantees phase-coherent sound across all frequency bands, creating a more lifelike and immersive soundstage with incredible detail resolution.

VDSF Target Tuning with Real-Ear Refinement

Harmon is tuned according to Moondrop’s VDSF target, based on B&K HRTF data, and further refined with real-ear testing to achieve an exceptional balance between analytical detail and musical warmth. Whether you're listening to classical, jazz, electronic, or rock, Harmon delivers a full-bodied, emotionally engaging sound signature.

Extremely Low Distortion Performance

Even at high output levels, the Harmon maintains distortion under 0.1% at 94dB SPL, outperforming most IEMs in its class. Expect a clean, transparent presentation, ideal for both critical listening and long immersive sessions.

Premium Build with Modular Cable System

Crafted using precision 3D printing by HeyGears, the Harmon features a compact, ergonomic shell that fits comfortably. It ships with a braided detachable cable and interchangeable 3.5mm single-ended and 4.4mm balanced plugs, making it ready for any audio source without extra adapters.

Key Features

• Triple 10mm dynamic drivers in coaxial configuration

• Four-cavity coaxial acoustic crossover system

• Glass-dome mid-treble driver with composite magnetic motor

• Horizontally opposed dual bass drivers with N52 magnets

• VDSF target tuning + real-ear adjustments

• Ultra-low distortion: THD ≤ 0.1% at 94dB SPL

• Phase-consistent across the full frequency range

• Measured with B&K 5128C HATS system

• Includes 3.5mm and 4.4mm plugs with premium braided cable