Experience the pinnacle of open-back headphone engineering. The Fostex TH909 builds upon the acclaimed TH900mk2, offering audiophiles and professionals a truly premium listening experience with open-back dynamics, enhanced driver design, and handcrafted Japanese aesthetics.

At its heart is a custom-developed 50mm biodynamic diaphragm powered by a 1.5-tesla magnetic circuit, delivering expansive dynamics, low distortion, and pristine frequency reproduction. The signature Bordeaux lacquered housings—crafted using the traditional Japanese Urushi technique—underscore its refined look and feel.

Comfort is matched with performance thanks to redesigned low-resilience earpads. Detachable rhodium-plated connectors support both unbalanced and optional balanced cables for versatile setups. Whether in critical mastering sessions or luxurious personal listening, the TH909 stands apart.

Key Features

• 1.5-tesla (15,000 gauss) magnetic circuit with repulsion magnet for wide dynamic range

• 50mm proprietary biodynamic diaphragm (biocellulose + inorganic fiber) for exceptional clarity

• Open-back double-layer etched metal grille for spacious soundstage

• Lacquered Japanese cherry birch housings in Bordeaux finish by Sakamoto Urushi Factory

• Detachable cable with rhodium-plated 2-pin connectors; supports optional balanced cables

• Includes premium OFC unbalanced cable (7N-grade, 3 m with gold-plated 1/4” TRS plug)

• Updated low-resilience earpads for improved comfort and acoustic seal

• Includes headphone stand and carrying pouch

Technical Specifications

Wearing Style: Dual ear with headband
Earpiece Design: Over-ear (circumaural), open-back
Driver: Dynamic, 50mm
Impedance: 25 Ohms
Sensitivity: 100 dB/mW at 1 kHz
Frequency Response: 5 Hz – 45 kHz
Maximum Input Power: 1800 mW
Cable: 3.0 m, 7N-grade OFC, detachable, straight
Connector: 1x 1/4" TRS, gold-plated
Weight: 390 g (without cable)
Color: Black / Bordeaux Red
Included Accessories: Headphone stand, carrying bag

Applications

• Audiophile-grade music listening

• Professional mastering and mixing

• Critical listening and audio evaluation

• High-end home audio setups

• Studio reference monitoring (open-back use)