FiiO JadeAudio JT9 Open-Back Planar Magnetic Headphones

The FiiO JadeAudio JT9 is a foldable open-back planar magnetic headphone built around a large proprietary 3.74 x 3.39 in (95 x 86 mm) planar driver. Its ultra-thin 0.000039 in (1 μm) diaphragm, sapphire and aluminum dual-coating technology and uniform magnetic field design are engineered to deliver fast transient response, fine detail and a spacious presentation.

The planar diaphragm combines a lightweight aluminum conductive layer with a rigid sapphire coating on a high-performance PET substrate. FiiO's optimized magnetic circuit distributes magnetic force evenly across the driver, helping maintain controlled diaphragm movement while reducing unwanted break-up and distortion.

With a 20-ohm impedance and sensitivity of 95dB/mW at 1kHz, the JT9 is designed to be easier to drive than many conventional planar magnetic headphones. FiiO recommends 300mW or more of amplifier output to fully drive the headphones.

The JT9 weighs approximately 12.9 oz (365 g) without its cable and features rotating, folding ear cups and a multi-axis headband for a comfortable, adaptable fit. Separate 3.5 mm single-ended and 4.4 mm balanced cables are included, along with a fitted water-resistant storage case.

Features:

• Large proprietary 3.74 x 3.39 in (95 x 86 mm) planar magnetic driver
• Ultra-thin 0.000039 in (1 μm) diaphragm
• Sapphire and aluminum dual-coated diaphragm
• Patented uniform magnetic field design
• 28nm-grade conductive voice-coil manufacturing process
• Open-back acoustic design
• 20Ω impedance for easier driving
• 95dB/mW sensitivity at 1kHz
• Foldable and rotating ear cup design
• Multi-axis headband and three-axis ear cup structure
• 22AWG high-purity oxygen-free copper cable
• Separate 3.5 mm single-ended and 4.4 mm balanced cables included
• Dual 3.5 mm TS headphone-side connectors
• Water-resistant woven-fabric storage case included
• Hi-Res Audio certified

Specifications:

• Model: JT9
• Headphone Type: Open-Back Planar Magnetic Headphones
• Driver: 3.74 x 3.39 in / 95 x 86 mm Planar Magnetic Driver
• Diaphragm Thickness: 0.000039 in / 1 μm
• Frequency Response: 7Hz–40kHz
• Impedance: 20Ω @ 1kHz
• Sensitivity: 95dB/mW @ 1kHz
• Sensitivity: 112dB/Vrms @ 1kHz
• Recommended Amplifier Output: 300mW or greater
• Cable Material: 22AWG High-Purity Oxygen-Free Copper
• Cable Length: Approximately 4.9 ft / 1.5 m
• Headphone Connectors: Dual 3.5 mm TS
• Audio Plugs: 3.5 mm Single-Ended and 4.4 mm Balanced
• Weight: Approximately 12.9 oz / 365 g excluding cable

What's in the Box:

• FiiO JadeAudio JT9 Headphones
• Storage Case
• 3.5 mm Single-Ended Headphone Cable
• 4.4 mm Balanced Headphone Cable
• 6.35 mm Male to 3.5 mm Female Adapter
• Quick Start Guide