FiiO JT7 Open-Back Planar Magnetic Headphones

• Proprietary 95 × 86 mm planar driver
• 1 μm ultra-thin diaphragm
• Patented sapphire and aluminum dual-coating technology
• Patented uniform magnetic field design
• 28 nm-grade manufacturing process
• High sensitivity of 95 dB/mW, easy to drive
• Lightweight, foldable design weighing just 365 g
• Custom-tuned cable for planar drivers
• Includes both 3.5 mm and 4.4 mm headphone cables
• Hi-Res Audio certification

Proprietary Engineering with a Deep Commitment to Sound Quality

95 × 86 mm Proprietary Planar Driver

The JT9 is built around a large 95 × 86 mm diaphragm, giving it a natural advantage in soundstage, bass extension, and dynamic range.

It is powered by planar driver technology developed in-house by FiiO's acoustic engineering team. Developed using the latest manufacturing techniques and continuously refined through real-world listening feedback from previous-generation products, every aspect—from production processes to key acoustic parameters—has been carefully optimized to deliver an even higher level of performance.

The improved manufacturing process lowers the driver's resonant frequency, allowing for deeper bass, a fuller and warmer sound signature, and greater overall refinement.

Complementing the driver is a newly designed earcup structure that reduces the in-head vocal effect and expands the vertical soundstage, creating a more spacious and natural presentation that remains comfortable to enjoy for hours.

Joseph, Chief Engineer of FiiO's IEM R&D Center, explains:

"One of the key advantages of a planar driver is its exceptionally light, ultra-thin diaphragm. With virtually no inertial mass to overcome, it can respond quickly even to the finest details in an audio signal. With the JT9, our goal was to create a planar headphone that is easy to enjoy for hours, with a spacious and well-organized soundstage. To achieve this, we drew inspiration from both the JT7 and the FT1 PRO, incorporating a secondary sapphire coating process. The result is an extended frequency response at both ends of the spectrum, more effortless bass, clearer treble, and improved reproduction of string instruments."

Ultra-Light, Ultra-Thin, Ultra-Responsive

1 μm Ultra-Thin Diaphragm

The large diaphragm delivers excellent bass extension and dynamic range, while its ultra-thin construction enables exceptionally fast driver response.

Featuring a 1 μm ultra-thin diaphragm, the JT9 embodies the defining qualities sought after in planar driver design: extremely low weight and exceptional thinness, allowing it to achieve remarkable performance within its class.

Its exceptionally fast transient response faithfully reproduces even the finest musical details, from the delicate harmonics of a violin to the lingering shimmer of a triangle.

With outstanding dynamic range and excellent frequency response, the JT9 captures every nuance with remarkable precision.

Two Advanced Materials, One Synergistic Design

Patented Sapphire and Aluminum Dual-Coating Technology

The JT9 is built around one of FiiO's signature acoustic patents: dual-coating technology, patent number ZL2024205488218.

Starting with a high-performance PET diaphragm substrate, natural sapphire and metallic aluminum were carefully selected for a precision dual-layer coating, comprehensively optimizing frequency response across the entire range.

The result is a dramatic leap in resolution, allowing listeners to experience the refined, nuanced sound quality and captivating tonal character unique to planar drivers.

Aluminum: Lightweight aluminum improves voice-coil conductivity, lowers impedance, and makes the headphones easier to drive while delivering a wider dynamic range.

Sapphire: Sapphire's exceptional hardness increases diaphragm rigidity, enhancing high-frequency resolution and clarity while contributing to the headphones' distinctive tonal character.

Masterful Craftsmanship, Semiconductor-Grade Precision

28 nm-Grade Manufacturing Process

The JT9 incorporates a 28 nm chip-level fabrication process derived from semiconductor manufacturing.

The conductive voice coil is processed in a high-vacuum environment of 6.6 × 10⁻³ Pa, completely isolated from air.

The chamber is then heated to 120°C, transforming the required metal target material into ionized particles. Through electrostatic attraction, these ions are deposited evenly and securely onto the diaphragm surface, forming the precise coating thickness required by the acoustic design.

This highly controlled manufacturing process delivers exceptional production precision while enhancing the durability and long-term reliability of the conductive voice coil.

Balanced Magnetic Field for Lower Distortion

Patented Uniform Magnetic Field Design

Traditional rectangular magnet arrays often produce an uneven magnetic field distribution, resulting in inconsistent force acting on different areas of the voice coil. This can induce diaphragm break-up and increase distortion.

To address this, the JT9 incorporates FiiO's proprietary uniform magnetic field technology, patent number ZL202420884963.1.

By optimizing the magnetic circuit and using custom-shaped, high-strength magnets, the JT9 creates an exceptionally uniform magnetic field across the entire driver.

This allows the entire diaphragm to move with more consistent excursion and driving force, effectively suppressing diaphragm break-up at its source.

The result is significantly reduced distortion, while preserving fine musical details with exceptional clarity.

Easy to Drive, Great Sound Anywhere

95 dB/mW High Sensitivity for Effortless Driving

With a sensitivity of 95 dB/mW at 1 kHz, the JT9 requires significantly less driving power than conventional planar headphones.

Whether connected to a smartphone with a portable DAC/amp dongle or to other everyday source devices, the JT9 is easy to drive while delivering rich, full-bodied sound, keeping outstanding planar performance within reach wherever you listen.

Welcome to a Lighter Era for Planar Headphones

365 g Lightweight, Foldable Design

The JT9 breaks free from the age-old problem of heavy, uncomfortable planar headphones. Wear them for hours and barely notice they are there.

Just 365 g: About 40 g lighter than typical full-size planar headphones, which usually weigh over 400 g and can cause greater head pressure and neck discomfort during extended listening sessions. The JT9's lighter weight reduces this burden, allowing listeners to immerse themselves fully in music for hours on end.

Foldable design: The rotating, foldable earcups collapse into a compact form that is easy to store and even easier to take with you, whether at home or on the move.

3D ergonomic design: Shaped to mirror the natural contours of the human face, the streamlined 3D design hugs the cheeks comfortably. Combined with a three-axis rotation structure, it provides a superior seal, a closer fit, and even, balanced clamping force for all-day comfort.

Ergonomic headband: The headband supports multi-axis rotational adjustment, while the earcups and connectors rotate and extend smoothly and freely. Regardless of head shape or ear contours, it provides a tailored fit.

The Right Cable for the Right Driver

Custom-Tuned Cable for Planar Drivers

A great driver deserves an equally great cable. That is why a specially tuned cable was developed around the acoustic characteristics of the JT9's planar driver.

Made from high-purity oxygen-free copper, it combines 0.06 mm, 0.08 mm, and 0.12 mm copper strands into a substantial 22 AWG conductor.

Carefully tuned to complement the driver's performance, it enhances the weight and body of the midrange and bass, delivers a more spacious and natural presentation, and enhances bass impact and ambience, bringing every note to life with rich, effortless energy.

Ready for a Wide Variety of Sources

Includes Both 3.5 mm and 4.4 mm Headphone Cables

The JT9 includes the following as standard:

• 3.5 mm to dual 3.5 mm single-ended cable
• 4.4 mm to dual 3.5 mm balanced cable
• 6.35 mm to 3.5 mm adapter

Whether connecting to different source devices or tailoring the setup to personal listening preferences, listeners can choose the cable that best suits their needs, providing more ways to experience their music.

Officially Designed, Thoughtfully Complete

Water-Resistant Storage Case Included

The JT9 comes with an official storage case, making storage and transport simple and worry-free.

Made from water-resistant, moisture-resistant woven fabric, the case is precisely sized to fit the JT9, providing dependable protection wherever it goes.

Hi-Res Audio Certified

Industry-Recognized Sound Quality

An authoritative stamp of approval for exquisite planar sound.

The JT9 has earned official Hi-Res Audio certification from the prestigious Japan Audio Society (JAS).

With benchmark-setting audio performance, it masterfully recreates the purity, nuance, and detail of a live musical performance.

Understated Elegance

Two Color Options

Available in classic black and retro deep brown.

These refined tones add a premium touch to the JT9's sleek contours. Whichever color you choose, the JT9 becomes a true audio work of art that expresses personal style.

Note: The deep brown edition is expected to officially launch in September 2026. Stay tuned.

Specifications

Headphone type: Open-back planar magnetic headphones

Frequency response: 7 Hz–40 kHz

Driver: 95 × 86 mm planar magnetic driver

Impedance: 20 Ω @ 1 kHz

Sensitivity: 95 dB/mW @ 1 kHz, 112 dB/Vrms @ 1 kHz

Weight: Approximately 365 g (excluding cable)

Cable material: 22 AWG high-purity oxygen-free copper

Cable length: Approximately 1.5 m

Headphone connectors: Dual 3.5 mm TS

Audio plugs: 3.5 mm and 4.4 mm

Color: Black or deep brown

Package Contents

• Headphones × 1
• Storage case × 1
• 3.5 mm single-ended headphone cable × 1
• 4.4 mm balanced headphone cable × 1
• 6.3 mm (male) to 3.5 mm (female) adapter × 1
• Quick Start Guide × 1