FT15 | Open-back Planar Headphones

Fully Evolved, a Bold New Debut
Refined across every dimension, all for a remarkable transformation. Backed by serious engineering, a new chapter in planar audio begins.

Advanced Engineering, a Generational Leap in Thickness | 800-nanometer Ultra-thin Diaphragm
FT15's diaphragm thickness drops from the previous generations 6 microns to a breakthrough 800 nanometres - 86.7% thinner than its predecessor. This nanometre-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.

Resolution
With nanometre-level diaphragm precision, the FT15 achieves faster transient response. Even subtle signals in the high and ultra-high frequencies can be reproduced with greater precision and accuracy.

Fidelity
The diaphragm follows the signal closely and moves with precision, starting and stopping in sync with the signal and minimal residual ringing. The result us an exceptionally clean and refined sonic character.

Listening Comfort
The ultra-thin diaphragm delivers greater compliance and lower distortion, producing smooth, refined highs that remain comfortable even ever long listening sessions.

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-aluminium 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 makes 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 tuned the substrate's natural frequency, lowering its resonance point for deep, powerful bass extensions.

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 a deep, solid bass, refined and easy-to-listen mid-to-high frequencies, and an overall warm and 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.

Bigger Surface Area, a Grander Sense of Scale | 101mm Large Driver
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 horizonal soundstage while effortlessly managing rapid dynamic swings.

Synchronised Response, Every Last Detail Intact | Patented Uniform Magnetic Field Design
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 optimised magnetic circuit alignment to create a highly uniform magnetic field. By driving the diaphragm evenly and synchronously across its entire surface, the design helps supress backup vibrations and distortion at the source, faithfully preserving the details of the original sound.

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 synchronisation of a diaphragm movement while maintaining greater consistency and stability in sound performance over time. Proven across multiple products, this process brings like likelihood of vibration-included coil damage close to zero.

Easy to Drive, Ready for Portable Hi-Fi | 95dB/mW High-sensitivity, Easy to Drive Design
The FT15 incorporates a dual-sided heterogeneous magnet array, leveraging the finite element analysis to optimise magnetic field distribution. This keeps the voice coil positioned within the strongest region of the magnetic field for ample driving force. The FT15 can easily be driven by portable players and dongle DACs, bringing you a full, solid sound wherever and whenever you listen.

Weight-reducing Materials Prove Planar Headphones Can Be Light | 425g Lightweight Design
To overcome the traditionally heavy weight of planar headphones, the engineers carefully optimised the material selection, structured design, magnetic circuit, and other aspects of the FT15, bringing the total weight down to 425g - significantly lighter than comparable planar headphones. Less weight, without compromising quality.

50g+ Lighter Weight Compared to Conventional Planar Headphones
Carbon Fiber Headband
The FT15 uses premium carbon fibre, a material that is both costly and difficult to process, taking advantage of its low weight, high rigidity, and toughness. Combined with an optimised structural design, it helps solve the problems of excessive weight and unwanted twisting or deformation.

Optimised Magnetic Circuit
The dual-sided heterogeneous magnetic circuit reduces magnetic weight compared with conventional designs while maintaining ample magnetic driving force.

High-end Specialty Modified Plastic Magnet Bracket
It matches aluminium alloy for rigidity but weighs in at just two-thirds the density - delivering all the magnetic-circuit strength FT15 needs, at a fraction of the weight.

Thoughtfully Selected Materials | Celebrating the Beauty of Nature | Premium North American Walnut Wood Ear Cups
The FT15's centre frame is crafted from North American FAS-grade black walnut*, some 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 signal-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 optimising 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 colouration so the timbre comes though transparent yet open and relaxed.

A Complete Premium Package, Right Out the Box | A Comprehensive Set of Premium Accessories | Two Sets of Pads Included
Suede Ear Pads
Highly durable, these pads deepen the bass and add warmth to vocals, with a smooth, non-fatiguing top end - ideal for pop and vocal focused music.

Protein Leather Ear Pads
Enhances high-frequency resolution and vocal clarity - well suited to classical instrumental music and female vocal tracks.

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.

Industry Certification | High-standard Audio Experience | Hi-Res Audio Certified
The 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.