Moondrop Harmon XTM-3DD Coaxial IEM

The XTM Series: A New Chapter in Acoustic Design

MOONDROP's XTM series introduces a pioneering approach to IEM crossover design. Breaking away from traditional styles, it opens a new path with bold experimentation and precision tuning. At the heart of this series lies the Harmon — a compact IEM with three full-size 10mm dynamic drivers and a patented coaxial four-cavity structure.

Triple 10mm Dynamic Drivers

Unlike conventional IEMs, the Harmon integrates three 10mm dynamic drivers within a tiny shell. Each driver is paired with an independent acoustic cavity, enabling detailed crossover control and exceptional tuning accuracy. This innovative architecture allows Harmon to deliver big, full-bodied sound from a surprisingly small enclosure.

Precision-Tuned Mid-Treble Driver

The mid-treble driver uses an ultra-thin, molded glass dome diaphragm with a flexible suspension structure. It offers higher stiffness, lower distortion, and extended high-frequency response. Treble is rendered with remarkable clarity, while the mids remain clean and textured.

Dual 10mm Bass Drivers

Horizontally-Aligned, High-Efficiency Design

Bass is driven by MOONDROP’s signature horizontally-opposed dynamic driver layout, using dual 10mm units with N52 magnets, CCAW voice coils, and flexible paper-composite diaphragms. The result is deep, punchy, and distortion-free low-end performance.

TO-Level Acoustic Simulation & Design

Backed by advanced FEA acoustic modeling and a team of senior engineers, the Harmon delivers accurate frequency response and impressive phase consistency. The tuning closely follows MOONDROP’s VDSF Target Response, enhanced further by subjective fine-tuning for a natural, engaging sound with excellent imaging.

Advanced 3D Printing Collaboration

To realize its intricate internal structure, MOONDROP partnered with HeyGears, a leader in high-precision DLP 3D printing. This ensures manufacturing consistency for the Harmon’s complex shell while enabling mass production without sacrificing accuracy.

Cable & Connectivity

Harmon comes with a high-quality braided cable and swappable terminations for broad compatibility.

Product Specifications:

Model: MOONDROP Harmon

Driver Configuration: 1 × 10mm Glass Dome Mid-Treble Dynamic Driver + 2 × 10mm Paper Cone Bass Dynamic Drivers (H.O.D.D.D.U.S.)

Impedance: 19Ω ±15% @1kHz

Sensitivity: 114dB/Vrms @1kHz

Frequency Response: 10Hz–60kHz

Effective Frequency Response (IEC60318-4): 20Hz–20kHz (–3dB)

THD: ≤0.1% @1kHz, 94dB

Connectors: 0.78mm 2-pin

Terminations: 3.5mm & 4.4mm (interchangeable)

Package Includes:

Harmon In-Ear Monitors

Detachable Cable (with 3.5mm & 4.4mm plugs)

Carrying Pouch

Ear Tips (S / M / L)

User Manual

Certificate

Warranty Card