Fostex TH-900mk2 Ultra-Premium 1.5 Tesla Stereo Headphones

Premium closed-back headphones built for critical listening
The Fostex TH-900mk2 is a high-end set of closed-back stereo headphones engineered for professional monitoring and high-fidelity listening. Featuring Fostex’s proprietary 1.5 Tesla magnetic flux driver system, these headphones are capable of delivering stunning sonic detail across a wide frequency spectrum. With rich tonal balance, tight bass, and extended highs, the TH-900mk2 is designed to meet the expectations of audiophiles, engineers, and discerning listeners alike.

Precision-crafted Japanese design using luxury materials
Each ear cup is constructed from betula grossa—also known as Japanese cherry birch—a wood prized for its density and tonal character. The housing is finished in traditional Urushi lacquer, a hand-applied process that enhances both visual beauty and surface durability. The deep Bordeaux red coloring and high-gloss finish make these headphones a visual standout in any studio or personal listening environment.

High-resolution audio powered by 1.5 Tesla magnetic circuitry
At the heart of the TH-900mk2 is Fostex’s powerful magnetic circuit, capable of generating a 1.5 Tesla magnetic flux density. This system drives a biodynamic 50mm diaphragm made from bio-cellulose fiber, enabling fast transient response, low distortion, and wide frequency extension. Whether you’re mastering music or enjoying high-resolution tracks, the soundstage remains detailed, open, and immersive.

Comfort-focused construction for extended use sessions
The TH-900mk2 offers a lightweight form factor at only 390 grams, and its ear pads and headband are made from protein leather derived from eggshell membrane. The material provides a soft, skin-like texture and reduces long-term fatigue. The ear cups swivel for added flexibility, while the moderate clamping force provides a secure yet comfortable fit. Though the dual-strip headband padding could be thicker, overall ergonomics are suited for hours of uninterrupted listening.

Versatile connectivity and premium cable system
These headphones ship with a detachable 3-meter unbalanced cable with a gold-plated 6.3mm stereo plug. An optional balanced cable (sold separately) allows audiophiles and engineers to pair the TH-900mk2 with balanced headphone amps and DACs. This dual connectivity ensures optimal compatibility with both home audio setups and professional gear.

Built for mastering, audiophile playback, and reference listening
Ideal for studio professionals and high-end consumers, the TH-900mk2 performs equally well in critical listening environments and luxury audio systems. Its superior transient response, clarity, and imaging make it a tool trusted by mastering engineers, while its premium build quality and refined design appeal to collectors and personal audio enthusiasts.

Craftsmanship that reflects 70 years of Fostex engineering
Fostex, a division of Foster Electric, brings decades of transducer development and professional audio experience to the TH-900mk2. From the precise acoustic tuning to the artisanal finishing techniques, every element of these headphones reflects the brand’s legacy of quality and innovation.