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The FiiO FH3 are hybrid in-ear monitors combining a 10mm dynamic driver with a beryllium-plated diaphragm and two Knowles balanced armature drivers. Their crossover distributes reproduction across the three drivers, while the S.TURBO architecture supports the dynamic driver in the bass.
Designed for portable listening, they feature an aluminum-magnesium alloy shell, an acoustic design aimed at preserving treble detail and a balanced pressure relief system. Their detachable cable with MMCX connectors and 3.5mm jack plug allows them to be used with various audio sources.
The FiiO FH3 combine a 10mm dynamic driver with a beryllium-plated diaphragm and two Knowles balanced armature drivers. A physical and electronic crossover distributes the signal between these drivers to cover the entire spectrum: the bass is handled by the dynamic driver, while the mids and highs are reproduced by the Knowles ED-30262 and RAD-33518 units. This architecture aims to combine a solid low end, full vocal reproduction and extended high frequencies.


The beryllium-plated diaphragm of the dynamic driver combines low mass and rigidity, two properties that favor a fast response to signal variations. FiiO complements this design with its S.TURBO acoustic architecture: turbine-inspired ducts filter out part of the unwanted high frequencies emitted by the dynamic driver, thus reinforcing bass presence.
The Knowles RAD-33518 driver, dedicated to high frequencies, is placed near the opening of the sound tube. This positioning reduces unwanted treble reflections before they reach the ear, in order to preserve more detail in this part of the spectrum. It complements the ED-30262 driver, which handles the mids and is designed to reproduce vocals with fullness.


Precision-machined from an aluminum-magnesium alloy, the FH3 shell features the wave-patterned faceplate characteristic of the range. Its curves were developed from morphological data and several rounds of testing to achieve a shape suited to extended wear. The patented balanced pressure relief technology complements it by maintaining pressure balance between the front and rear chambers, preserving signal dynamics and promoting comfortable listening.
The FH3 are supplied with a silver-plated monocrystalline copper cable made of four strands of 96 wires. Its MMCX connectors allow it to be detached from the earphones, while the gold-plated 3.5 mm jack plug connects to the source.

Technical specifications
| Specifications | |
|---|---|
| Product type | In-ear monitors |
| Frequency response | 10Hz-40kHz |
| Impedance | 24Ω |
| Sensitivity | 114dB |
| Drivers | 1x 10mm dynamic driver with beryllium-plated diaphragm 1x Knowles ED-30262 1x Knowles RAD-33518 |
| Cable termination | Jack 3.5mm |
| Earphone connectors | MMCX |
| Cable conductor material | Silver-plated copper |
| General | |
|---|---|
| Weight | 7.3g / earphone |
| Color | Black |
| Package | 1x FiiO FH3 1x Jack 3.5mm to MMCX cable 11x Pairs of ear tips |
| Color | Black |
| Impedance (Ω) | 24 |
| Efficiency / Sensitivity (dB) | 114.0 |
| Wireless | No |
| Cable termination | Jack 3.5mm |
| Headphone / Earphone connector | MMCX |
| Phone call feature | No |
| Noise reduction | No |