800nm ultra-thin diaphragm | Diamond-coated diaphragm 

Proprietary planar technology | 101mm large planar driver

Patented uniform magnetic field design | 28nm chip-grade manufacturing process  95dB/mW high-sensitivity easy-to-drive design  Lightweight 425g construction Premium North American walnut wood ear cups | Liquid-nitrogen-treated 6N monocrystalline copper cable

Advanced engineering,

A generational leap in thinness.

800-nanometer ultra-thin diaphragm

FT15's diaphragm thickness drops from the previous generation's 6 microns to a breakthrough 800 nanometers—86.7% thinner than its predecessor. This nanometer-scale thinness approaches the physical limits of the material, representing the current state of the art in the industry. A thinner diaphragm means better sound, across the board:

A complete premium package,

Right out of the box

A comprehensive set of premium accessories

Two sets of ear pads included

Innovative diamond coating,

Next-level acoustic performance

The FT15 incorporates FIIO's self-developed patented multi-layer coating technology*. The voice coil features a silver-aluminum alloy coating to enhance its mechanical performance and conductivity, while the diaphragm employs an innovative full-surface diamond coating. Using a highly sophisticated manufacturing process, this design brings the unique physical properties of diamond into the acoustic field. The diamond material used in FT15's coating offers greater hardness and structural stability—the same properties that make it a common choice for tweeter diaphragms in high-end loudspeakers. Applied through a vapor deposition process, this coating forms a stable reinforcing layer on the diaphragm that reduces high-frequency breakup and improves response speed, extending frequency response up to 40kHz. Because the coating resists decomposition and fatigue even under prolonged vibration, it maintains consistent acoustic performance over the long term. A vacuum high-temperature treatment further tunes the substrate's natural frequency, lowering its resonance point for deep, powerful bass extension.

Evolved in every dimension, The planar legacy continues Proprietary planar technology

Building on the foundation established by the pioneering FT5, the FT15 brings a new evolution of planar design. It features a groundbreaking 800nm ultra-thin diaphragm and FIIO’s first diamond-coating process, capturing even the finest nuances in the music. A specially refined patented magnetic circuit applies force to the diaphragm more evenly and powerfully, reducing vibrational distortion. The result is deep, solid bass, refined and easy-to-listen mid-to-high frequencies, and an overall warm, natural sound. At the same time, the FT15 combines high sensitivity and easy drivability with a lightweight design, delivering not only outstanding sound but also a more relaxed, comfortable experience for long listening sessions.

The effective vibrating area of a diaphragm directly dictates bass energy density and soundstage scale. Equipped with a massive 101mm full-size driver, the FT15 boasts an effective vibrating area of 6,443.5mm²—an impressive 35% increase over the previous-generation FT5. This abundant energy reserve equips the FT15 with exceptional dynamic impact and sub-bass reach. When rendering grand dynamic pieces like full-scale symphonies, it presents a wider, more natural horizontal soundstage while effortlessly managing rapid dynamic swings.

Bigger surface area, A grander sense of scale 101mm large driver

Traditional rectangular magnet designs create uneven magnetic field distribution, which can often lead to diaphragm breakup vibration and distortion, compromising the sound. The FT15 features FIIO's specially developed patented uniform magnetic field technology*, combining custom-shaped high-strength magnets with precisely optimized magnetic circuit alignment to create a highly uniform magnetic field. By driving the diaphragm evenly and synchronously across its entire surface, the design helps suppress breakup vibration and distortion at the source, faithfully preserving the details of the original sound.

*Patent number:ZL202420884963.1

Synchronized response, Every last detail intact Patented uniform magnetic field design

Planar diaphragm manufacturing benchmark 28nm chip-grade manufacturing process

Conductive coils have long had a weakness: they fatigue and break down over time. FT15 solves it by borrowing a precision process straight from the semiconductor industry. Through vacuum electroplating, the voice coil is uniformly formed on the diaphragm, greatly strengthening the bond between the conductive layer and the diaphragm substrate. The structure remains firmly bonded and stable through prolonged vibration, improving the synchronization of diaphragm movement while maintaining greater consistency and stability in sound performance over time. Proven across multiple products, this process brings the likelihood of vibration-induced coil damage close to zero.

The FT15 incorporates a dual-sided heterogeneous magnet array, leveraging finite element analysis to optimize magnetic field distribution. This keeps the voice coil positioned within the strongest region of the magnetic field for ample driving force. The FT15 can be easily driven by portable players and dongle DACs, bringing you a full, solid sound wherever and whenever you listen.

Easy to drive, Ready for portable Hi-Fi 95dB/mW high-sensitivity, easy-to-drive design

Weight-reducing materials prove planar headphones can be light

425g lightweight design

Thoughtfully selected materials,

Celebrating the beauty of nature

Premium North American walnut wood ear cups

The FT15's center frame is crafted from North American FAS-grade black walnut*, a wood commonly used in luxury car interiors, fine furniture, and premium musical instruments. Each pair is meticulously finished and polished to preserve the wood's natural grain, resulting in a piece that's as much a collectible as it is a pair of headphones—where musical craftsmanship meets fine woodworking. *FAS (Firsts and Seconds) is a top-tier grading standard used in the North American hardwood industry, denoting timber that has passed rigorous quality screening. Compared to standard-grade wood, FAS-grade black walnut offers more consistent grain patterns, fewer natural imperfections, and greater workability.

Premium materials, Exceptional signal transmission down to the wire

Liquid-nitrogen-treated 6N monocrystalline copper cable

The FT15 uses 6N OCC single-crystal copper with a purity of up to 99.99998%, offering no grain boundaries, low resistance, and high electrical conductivity. These properties help reduce interference from oxygen and hydrogen impurities during signal transmission. Each conductor undergoes 100+ hours of -192°C liquid-nitrogen cryogenic treatment, releasing internal metal stress and optimizing its microscopic structure. This allows the signal to travel with effortless smoothness and revealing clearer, more distinct sound. The FPA insulation further applies a subtle tuning to the mid-low frequencies, adding just the right amount of coloration so the timbre comes through transparent yet open and relaxed.

4.4mm balanced headphone cable + versatile adapters

Included as standard are a 4.4mm balanced headphone cable, a 4.4mm-to-6.35mm adapter, and a 4.4mm-to-XLR-4 balanced adapter, giving you more ways to connect, upgrade, and enjoy the FT15.

Yaoli linen storage case

Industry certification,

High-standard audio experience

Hi-Res Audio certified

The FIIO FT15 is certified for high-quality audio by the Japan Audio Society (JAS), accurately reproducing high-fidelity sound to deliver an authentic, true-to-life listening experience.