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FiiO FD3 Pro Single Dynamic Driver IEMs with Detachable Cable
Overview
The FiiO FD3 Pro is a single dynamic driver in-ear monitor built around a 12mm driver with a Diamond-Like Carbon (DLC) diaphragm. It's for listeners who want the natural, coherent sound of one well-tuned driver, and the Pro version adds a better silver-plated cable with swappable 2.5mm, 3.5mm, and 4.4mm plugs.
The DLC diaphragm is rigid yet light, which keeps distortion low and transients quick. A 1.5 Tesla magnet and an ultra-fine copper-clad aluminum Japanese Daikoku voice coil give the driver plenty of drive. The acoustic prism system, carried over from FiiO's flagship FD5, reduces high-frequency standing waves and helps sound diffuse evenly, while the semi-open design balances air pressure for a more natural, less fatiguing listen.
The shell pairs a light aluminum-magnesium alloy body with a celluloid panel under 2.5D film-coated glass. The FD3 Pro's exclusive cable uses 152 strands of high-purity monocrystalline silver-plated copper in a Litz braid, with blue and red left/right markings and expanded MMCX connectors. It's Hi-Res Audio certified, and each earpiece weighs about 7g.
Simcoe Audio Video Insight
The FD3 Pro is a smart pick if you want a single dynamic driver with a natural, open sound and a cable that works with almost any source. The semi-open design eases pressure on your ears for long sessions, though it lets in a bit more outside sound than a fully sealed IEM. At 32 ohms and 111dB/mW, it's easy to drive from a phone dongle or player. Use the 4.4mm or 2.5mm plug if your source has a balanced output.
More Info
Why the FiiO FD3 Pro Stands Out
12mm DLC Dynamic Driver
Rigid, light diaphragm for low distortion and quick transients.
Strong Motor
1.5 Tesla magnet and Japanese Daikoku voice coil.
Acoustic Prism System
Carried over from FiiO's flagship FD5.
Semi-Open Design
Balances air pressure for a more natural, relaxed sound.
Swappable 2.5/3.5/4.4mm Plugs
One cable for single-ended and balanced sources.
Silver-Plated Copper Cable
152 wires in a Litz braid with expanded MMCX.
Buyer's Guide
Who It's For
- The Single-Driver Fan: Wants the coherent sound of one dynamic driver.
- The Long-Session Listener: Wants a light, pressure-relieving fit.
- The Multi-Source User: Wants one cable for 2.5mm, 3.5mm, and 4.4mm sources.
How It Compares
Compared with the standard FD3, the FD3 Pro adds a 152-wire silver-plated copper cable with swappable 2.5mm, 3.5mm, and 4.4mm plugs. The standard FD3 uses a 120-wire copper cable with a fixed 3.5mm plug.
FiiO FD3 Pro Single Dynamic Driver IEMs with Detachable Cable Specifications
| General Information | |
|---|---|
| Model | FiiO FD3 Pro |
| Brand | FiiO |
| Product Type | Single dynamic driver in-ear monitor, wired |
| Audio | |
| Driver | 12mm dynamic, Diamond-Like Carbon (DLC) diaphragm |
| Magnet | 1.5 Tesla |
| Voice Coil | Copper-clad aluminum, Japanese Daikoku wire |
| Acoustic Design | Acoustic prism system; semi-open |
| Frequency Response | 10Hz to 40kHz |
| Impedance | 32 ohm @ 1kHz |
| Sensitivity | 111dB/mW @ 1kHz |
| Certification | Hi-Res Audio |
| Cable | |
| Cable | High-purity monocrystalline silver-plated copper, 8 strands x 19 wires (152), Litz braid |
| Connector | Expanded MMCX |
| Plugs | Swappable 2.5mm, 3.5mm, 4.4mm |
| Length | About 1.2m |
| Physical Specifications | |
| Shell | Aluminum-magnesium alloy body; celluloid panel with 2.5D film-coated glass |
| Weight | About 7g per earpiece (excluding cable) |
| Colours Available | Black |
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