Apos Audio
Sponsor: Apos Audio
Hi all,
We’re excited to share a brand-new launch from Moondrop — The Moondrop Harmon Hybrid Dynamic Driver IEMs (In-Ear Monitors) are built around a trio of full-sized 10mm drivers—two for bass, one for mid-treble—each housed in its own acoustically tuned chamber.
The secret sauce is a patented four-cavity acoustic crossover system that lets the drivers blend naturally—no harsh handoffs, no smearing.
Product highlights
Specs

We’re excited to share a brand-new launch from Moondrop — The Moondrop Harmon Hybrid Dynamic Driver IEMs (In-Ear Monitors) are built around a trio of full-sized 10mm drivers—two for bass, one for mid-treble—each housed in its own acoustically tuned chamber.
The secret sauce is a patented four-cavity acoustic crossover system that lets the drivers blend naturally—no harsh handoffs, no smearing.
Product highlights
- Triple 10mm dynamic drivers in coaxial formation
- Glass-dome mid-treble driver with composite magnetic circuit
- Dual horizontally-opposed bass drivers with N52 magnets
- Four-cavity coaxial acoustic crossover system
- VDSF target tuning with real-ear refinement
- THD ≤ 0.1% at 94dB SPL
- High phase consistency across full frequency band
- B&K 5128C HATS tuned and measured
- Precision DLP 3D printed shells from HeyGears
- 3.5mm and 4.4mm plugs included with braided cable
Specs
- Model: Harmon In-Ear Monitors (Coaxial Four-Cavity Frequency Crossover / Three Dynamic Drivers)
- Driver configuration:
- 1x 10mm Glass Dome Composite Diaphragm Mid-Treble Driver
- 2x 10mm Paper Cone Composite Diaphragm Bass Drivers (H.O.D.D.D.U.S.)
- Impedance: 19Ω ±15% (@1kHz)
- Sensitivity: 114dB/Vrms (@1kHz)
- Frequency response: 10Hz–60kHz
- Effective frequency range: 20Hz–20kHz (IEC60318-4, -3dB)
- THD: ≤0.1% (@1kHz, 94dB)
- Connectors: 0.78mm recessed 2-pin
- Cable plugs: 3.5mm single-ended and 4.4mm balanced

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