Sitting between dynamic moving coil and electrostatic headphones, planar magnetic headphones use a moving coil, like dynamics, but via a special, micron-level thin-film diaphragm, like electrostatic designs. Along with a 28 nm chip-scale process that yields a 6μm-thick diaphragm, the FT5 offers exceptionally detailed sound while also being much easier to drive, lowering power requirements.

When it comes to headphones, diaphragm design is everything. Too thin, and its likely to fall off the chassis. Too thick, and the sound quality will suffer.

After extensive testing, FiiO determined that a 6μm PAR diaphragm offers the best balance of efficiency, reliability, and resolution. This material ensures the FT5 sports excellent dynamics, a highly detailed sound, and rich bass not typically found in planar magnetic headphones.

The FiiO FT5 employs an extremely high-performance 90mm planar magnetic driver. Compared to a traditional dynamic driver, a planar magnetic drivers converts electrical signals to acoustic sound energy in a much more uniform manner, vibrating far more evenly across its diaphragm than a dynamic coil design.

Thanks to this even distribution of vibration and the lesser rigidity of the planar design over a dynamic one, there is little distortion and audio signals can be expressed in an accurate, faithful way. This technology is ideal for a truly lossless high-fidelity sound.

Since all the weight in a flat-diaphragm headphone design like planar magnetic is concentrated on the metal coils, selecting the ideal material is key to success. After extensive testing, FiiO chose a lightweight aluminum alloy as the ideal material. These coils are then coated in silver to enhance conductivity, making the driver easier to power without sacrificing high-frequency detail and the rich sound characteristic of planar magnetic headphones.

Partly to ensure greater wearing comfort, 11 magnets are placed inside the FT5’s planar driver and 9 magnets are placed on the outside, leading to 20 magnets per channel and 40 in total. This balanced placement of magnets allows the aluminum alloy coils to be evenly distributed in the magnetic field. 

It also allows the driver diaphragm to be well balanced between the forces of the inner and outer magnets, guaranteeing consistent movement of the driver and reduced distortion. The FT5 employs N52 neodymium magnets with magnetic density up to 1.5T, providing the strong forces needed to driver the large planar magnetic driver.

Traditionally, planar magnetic headphones are known for having low sensitivity, leading to many audiophiles using beefy desktop preamps to drive them to their full potential. Typically, this made them a poor choice for listening while on the go.

But the FT5 bucks this trend with its high-powered magnetic field, ultra-thin diaphragm, and nano-scale aluminum coating technology, allowing for a high sensitivity of 110 dB. This allows the FT5 to be easily driven by portable audio devices, allowing you to experience the golden hall of sound no matter where you are.

ヘッドフォン

Wearing Style	Dual Ear with Headband Foldable: Yes Earpiece Swivel: Yes
Earpiece Design	Over-Ear (Circumaural)
Open/Closed-Back	Open-Back
ドライバータイプ	Planar
ドライバーサイズ	3.5″ / 90 mm
インピーダンス	36 Ohms
Active Noise Cancellation	いいえ
Frequency Response	7 Hz to 40 kHz
感度	110 dB at 1 kHz / 110 Vrms 96 dB/mW at 1 kHz
Maximum Power Handling	2000 mW