Overview

The FiiO FP3 is an in-ear monitor built around a second-generation, self-developed 14.5mm planar driver with a 1µm ultra-thin dual-coated diaphragm and a 7x2 array of 14 N52 neodymium magnets. It covers a 10Hz–40kHz frequency range at 36Ω impedance and 105dB/mW sensitivity, and uses a patented Tesla valve acoustic structure to help shape bass response. The faceplate is finished in black walnut over a high-precision 3D-printed shell with a UV coating, weighing about 6.5g per earpiece. A 4-strand, 392-wire silver-plated copper cable connects via a 0.78mm 2-pin detachable connector to a gold-plated 3.5mm plug.

Simcoe Audio Video Insight

Planar drivers are more common in full-size headphones than in-ear monitors, since fitting one into an earpiece small enough to wear comfortably is a harder engineering problem. FiiO's approach here — a thin dual-coated diaphragm paired with a dense 14-magnet array — is built specifically to make a planar driver work at IEM scale.

• 14.5mm planar driver with 1µm dual-coated diaphragm
• Black walnut wood faceplate over a 3D-printed shell
• 0.78mm 2-pin detachable silver-plated copper cable

Best for the FiiO FP3: give the planar driver a source with enough current to properly control it, since planar drivers generally respond well to a dedicated amp even at a moderate 36-ohm impedance.

More Details

Why It Wins

• 14.5mm Planar Driver: A self-developed, second-generation design with a 1µm ultra-thin dual-coated diaphragm.
• 14-Magnet Array: 14 N52 neodymium magnets in a 7x2 pattern driving the diaphragm.
• Black Walnut Faceplate: A wood finish over a high-precision 3D-printed shell.

What Makes It Different

Most IEMs in this price range use dynamic or balanced armature drivers. The FP3's planar driver is a less common choice at this size and price, aiming for the fast, detailed transient response planar technology is known for in full-size headphones.

Technical Highlights

• Tesla Valve Design: A patented acoustic structure used to help shape bass response.
• Hi-Res Audio Certified: Certified by both JAS and CEA.
• 0.78mm 2-Pin Detachable Cable: Easy to replace or upgrade.

Buyers Guide

Who This Is For

• The Planar Curious Listener: Wants to try planar driver technology in an IEM form factor.
• The Detail-Focused Listener: Will appreciate the fast transient response planar drivers are known for.
• The Wood Finish Enthusiast: Drawn to the black walnut faceplate.

Ideal Use Case

• Desktop and Home Listening: Paired with a dedicated amp to properly drive the planar element.
• Critical Listening Sessions: Where fast, detailed transients matter most.
• Portable Use with an Amp: A DAP or portable amp helps the driver perform at its best.

What To Pair It With

• A Portable or Desktop Amp: To properly drive the planar driver.
• A High-Resolution DAP: For detailed, source-limited listening.
• Lossless or Hi-Res Source Material: To make full use of its Hi-Res Audio certification.

Alternative Options

The FP3 is a planar driver IEM with a fixed 3.5mm cable. If you'd like the same driver with built-in USB-C decoding instead, the FiiO FP3 TC adds a DSP decoding chip for plug-and-play playback from a phone or computer without a separate DAC/amp.