Moondrop Harmon | Dynamic Universal IEMs

Harmon Explores a New Approach to IEM Crossover Design, Diverging From the Moondrop's Established Style

• Triple 10mm Dynamic Driver IEM
  
• Coaxial Four-Cavity Frequency Crossover
  
• Dynamic and impactful sound
  
• Independent acoustic cavities for precise tuning
• Features ultra-thin glass dome diaphragm for clear treble
  

The XTM Series

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.

Mid-Treble Dynamic Driver

The driver employs a glass-dome composite flexible-suspension diaphragm, created using a specialized glass molding process. This diaphragm exhibits significantly higher rigidity and improved damping characteristics compared to metal diaphragms. As a result, it delivers a crystal-clear sound with exceptional treble extension and rich high-frequency detail.

The new compact internal and external composite magnetic circuit unit uses two N52 neodymium magnets and three magnetic conductors. It is equipped with a OFC lightweight voice coil to form a high-efficiency, low-distortion transducer system, taking advantage of the new diaphragm.

Dual 10mm Bass Dynamic Drivers

The bass is produced by dual 10mm dynamic drivers, following the classic horizontally-opposed double dynamic driver alignment. This design improves magnetic circuit efficiency, enhances dynamic range, and reduces nonlinear distortion. Each driver includes a N52 internal magnetic circuit, a CCAW lightweight voice coil, and flexible paper-composite diaphragms. This ensures deep, punch and low-distortion bass.

TO-Level Acoustic Simulation and 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.

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.

Specifications

• Driver: (2x) 10mm Paper Cone DD + (1x) 10mm Glass Dome Mid-Treble DD
• Impedance: 19Ω ±15% @ 1kHz
  
• Frequency Response: 10Hz–60kHz
• Effective Frequency Response: 20Hz–20kHz (–3dB, IEC60318-4)
• Sensitivity: 114dB/Vrms @ 1kHz
• THD: ≤0.1% @ 1kHz, 94dB
• Termination: SE 3.5mm + BAL 4.4mm
• Connector: 0.78 2-pin

In the Box

• Moondrop Harmon IEMs
• Detachable IEM Cable
  
• Carrying Pouch
• Ear tips (S/M/L)
• User Manual
• Certificate
• Warranty Card