FiiO JT9 — Open-Back Planar Magnetic Headphones

The FiiO JT9 (Jade Audio JT9) is a high-performance open-back planar magnetic headphone that brings audiophile-grade planar technology to an accessible price point. Featuring a custom 95×86mm planar driver with an ultra-thin 1μm PET diaphragm and sapphire-aluminum dual coating, the JT9 delivers exceptional resolution, wide soundstage, and natural timbre. With a low 20Ω impedance and 95dB sensitivity, it is easily driven by portable devices while still scaling with higher-end desktop amplification.

Custom 95×86mm Planar Driver

At the heart of the JT9 is a custom 95×86mm planar magnetic driver — significantly larger than typical portable-oriented planar drivers. The large diaphragm area delivers powerful, authoritative bass and a wide, immersive soundstage. The uniform-field magnetic system ensures consistent magnetic flux across the entire diaphragm, minimizing distortion and ensuring accurate, linear response.

1μm Ultra-Thin Diaphragm with Sapphire-Aluminum Coating

The JT9 features an exceptionally thin 1μm PET diaphragm — significantly thinner than the 3μm+ diaphragms found in most conventional planar headphones. This ultra-thin diaphragm enables fast, precise transient response and reproduces subtle high-frequency and ultra-high-frequency signals with exceptional detail. The sapphire + aluminum dual-layer coating combines excellent electrical conductivity with high rigidity, ensuring the diaphragm moves with precision and control.

Low Impedance, High Sensitivity — Easy to Drive

Historically, planar magnetic headphones have required powerful, dedicated desktop amplifiers to sound their best. The JT9 breaks this mold with a highly efficient design featuring 20Ω impedance and 95dB/mW sensitivity. With just 300mW of output power, the JT9 comes alive with dynamic, effortless sound. This makes it an ideal match for portable DAC/AMPs, smartphones, and laptops, while still benefiting from higher-end desktop amplification for maximum performance.

Balanced, Neutral Sound Signature

The JT9 features a neutral, balanced sound signature with refined tuning:

• Bass: Reduced quantity compared to its predecessor, with deeper, tighter extension and excellent control
• Mids: Vocals are slightly recessed for a more natural, spacious presentation with excellent instrument separation
• Treble: Enhanced detail and harmonic overtone reproduction, with smooth, non-fatiguing extension
• Soundstage: Wide, open, and airy with excellent depth and imaging precision

Premium Build & Comfort

The JT9 features a foldable multi-axis ergonomic design for easy storage and transport. The aluminum alloy mesh grille provides enhanced rigidity and premium feel compared to standard steel mesh. At just 365g (without cable), the JT9 is remarkably lightweight for a full-size planar headphone, ensuring comfortable long listening sessions — even for glasses wearers. The open-back design provides a natural, spacious listening experience.

Premium Cable & Accessories

The JT9 comes complete with premium cables and accessories:

• 3.5mm single-ended cable — 22AWG high-purity oxygen-free copper
• 4.4mm balanced cable — 22AWG high-purity oxygen-free copper for balanced amplification
• 6.35mm adapter — for connecting to desktop amplifiers and audio interfaces
• Carrying case — water-resistant storage pouch for transport and protection

Specifications

What's in the Box

• 1× FiiO JT9 Open-Back Planar Headphones
• 1× 3.5mm Single-Ended Cable (22AWG OFC)
• 1× 4.4mm Balanced Cable (22AWG OFC)
• 1× 6.35mm Adapter
• 1× Carrying Case
• 1× Quick Start Guide
• 1× Warranty Card

Warranty & Support

Eligible returns may be requested within 30 days after receipt, with no restocking fee. See our Return Policy for eligibility, return shipping responsibilities, and exclusions. 1-year warranty. FiiO official after-sales support. Our team is available for technical assistance and setup guidance.