FiiO JT9 Open-Back Planar Magnetic Headphones
The FiiO JT9 Open-Back Planar Magnetic Headphones deliver audiophile-grade acoustic transparency, expansive spatial imaging, and remarkably natural musical timbre. Built around a proprietary 95mm by 86mm large-format planar magnetic driver with an ultra-thin 1-micron nanoscale diaphragm, the JT9 achieves lightning-fast transient response and deep, distortion-free low-end extension. The open-back acoustic architecture allows sound waves to breathe naturally, eliminating internal cup resonance and creating a wide, three-dimensional soundstage ideal for critical listening, studio monitoring, and high-fidelity home audio sessions.
Engineered for enduring listening comfort and modern aesthetics, the JT9 is available in sleek Matte Black or rich Deep Brown textured finishes, complemented by an ergonomic suspension headband and breathable contoured ear cushions. Dual detachable cable entry provides maximum flexibility for both standard single-ended and balanced amplifier configurations, ensuring seamless pairing with desktop DAC/amps, digital audio players, and portable listening stations.


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The FiiO JT9 Open-Back Planar Magnetic Headphones deliver audiophile-grade acoustic transparency, expansive spatial imaging, and remarkably natural musical timbre. Built around a proprietary 95mm by 86mm large-format planar magnetic driver with an ultra-thin 1-micron nanoscale diaphragm, the JT9 achieves lightning-fast transient response and deep, distortion-free low-end extension. The open-back acoustic architecture allows sound waves to breathe naturally, eliminating internal cup resonance and creating a wide, three-dimensional soundstage ideal for critical listening, studio monitoring, and high-fidelity home audio sessions.
Engineered for enduring listening comfort and modern aesthetics, the JT9 is available in sleek Matte Black or rich Deep Brown textured finishes, complemented by an ergonomic suspension headband and breathable contoured ear cushions. Dual detachable cable entry provides maximum flexibility for both standard single-ended and balanced amplifier configurations, ensuring seamless pairing with desktop DAC/amps, digital audio players, and portable listening stations.
Features:
- Proprietary 95 x 86mm Planar Driver: Large-format planar magnetic diaphragm delivers expansive dynamics, rich bass texture, and effortless detail across the entire frequency spectrum.
- Ultra-Thin 1-Micron Diaphragm: Advanced nanoscale diaphragm coating ensures ultra-fast transient speed, resolving subtle musical nuances and intricate instrumental layers.
- Natural Open-Back Acoustic Architecture: Eliminates internal reflections and ear cup pressure, providing a lifelike, three-dimensional acoustic soundstage.
- Ergonomic Suspension Headband: Lightweight pressure-distributing suspension system ensures hours of fatigue-free listening comfort.
- Dual Detachable Balanced Cabling: Includes both 3.5mm single-ended and 4.4mm balanced audio cables with gold-plated connectors for broad source compatibility.
- Contoured Memory Foam Ear Cushions: Breathable hybrid fabric and plush memory foam deliver gentle acoustic sealing and long-term wearing comfort.
- High Sensitivity and Easy Drivability: Efficient acoustic motor system pairs effortlessly with portable digital audio players as well as dedicated high-power desktop amplifiers.
Specifications:
- Acoustic and Driver Benchmarks:
- Driver Type: Planar Magnetic (Proprietary 95 x 86 mm)
- Diaphragm Thickness: 1 μm ultra-thin PET with sapphire and aluminum coating
- Acoustic Design: Open-Back, Over-Ear (Circumaural)
- Frequency Response: 7 Hz – 40,000 Hz
- Impedance: 20 Ohms @ 1 kHz
- Sensitivity: 95 dB/mW (108 dB/Vrms) @ 1 kHz
- Total Harmonic Distortion: Less than 0.2% @ 1 kHz, 94 dB
- Connectivity and Build:
- Cable Connectors: Dual 3.5 mm earcup jacks, detachable
- Source Plugs: 3.5 mm single-ended plug, 4.4 mm balanced plug, 6.35 mm (1/4") adapter
- Headband Construction: Lightweight aluminum alloy with adaptive suspension strap
- Ear Cushion Material: Breathable hybrid memory foam
- Available Finishes: Matte Black, Deep Brown
- Net Weight: Approximately 365 g (excluding cable)
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