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Features
•Uniquely designed Neodymium magnetic circuit adopting the magnetic repulsion system with 1.5 tesla (15,000 gauss) magnetic flux density to achieve wider dynamic range •Detachable unbalanced cable is made of 7N grade (99.99999%) OFC and highly durable duralumin plug case
•Proprietary "Biodyna" diaphragm for fine and high resolution sound reproduction .
• The housings are finished by Japanese traditional "Urushi" lacquer by a 110 years old artisan group on Japanese Cherry Birch.
•The ear pads are made of protein leather made from eggshell membrane for maximum comfort.
•Custom made Onyx Black colored Uruish lacquer, which requires very special treatments and process in its production
•Unlike the regular TH900mk2, the groove on the housings is removed for smooth and flat surface.
•The finish offers the beautiful grain of the wood showing through.
•Gold Fostex logo on the housings
•Anniversary audio tuning featuring smooth and straight lows
What's In The Box?
•Headphones
•Leatherette carrying pouch
•3.5 mm jack plug to 6.3 mm adapter
•Fostex ET-H30N7UB premium unbalanced cable
•Quick Guide
•Fostex logo sticker
•No headphone stand included.
The Fostex TH-900mk2 Limited Edition Onyx Black stands out for its premium lambskin earpads, expansive soundstage, and that signature bass punch— a cult favorite among planar magnetic fans chasing studio-grade detail without the hype.
At USD1,300, this B-Stock listing feels ambitious; recent comparables peg the median used price at USD428, with 25th-75th percentiles spanning USD250 to USD1,143. You're paying a premium for the limited black finish and presumed better-than-average condition, but shop around for similar units nearer USD800-1,000 to gauge if it's worth it. Before biting, verify the original box, dual cables (balanced and unbalanced), and 6.3mm adapter are included, as they're often missing on resale. Also, inspect the headband adjustment mechanism and driver flex—common wear points on these after 5+ years that can loosen the magic.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Fostex emerged in 1973 as the branded consumer and professional division of Foster Electric Co., Ltd., a Japanese loudspeaker manufacturer founded in 1949. Established to bring Foster's high-quality speaker components directly to dealers and customers, Fostex quickly gained international recognition through innovative products like the T20RP headphones and 6301 studio monitors. The brand's foundation rests on Foster's position as one of the world's largest OEM loudspeaker developers, employing tens of thousands across multiple countries and manufacturing millions of speaker units monthly.
The company built its reputation across three interconnected product categories: professional studio equipment, consumer headphones, and powered monitor speakers. Fostex became particularly renowned for pioneering RP (Regular Phase) technology, which delivers clear sound with high sensitivity and wide dynamic range—a signature that defines their headphones, microphones, and speaker designs. Beginning in 1978, the brand expanded into professional speaker development, eventually introducing the PM series of powered monitors and establishing itself as a trusted choice for recording studios, broadcast facilities, and serious home listeners.
Fostex occupies a distinctive middle ground in the audio market: neither ultra-premium boutique nor mass-market consumer, but rather a respected specialist brand with deep professional credentials. Their products appeal to recording engineers, studio owners, and discerning hi-fi enthusiasts who prioritize accuracy and reliability over luxury positioning. The 6301B monitor remains an industry standard after decades in production, while the T20RP headphones maintain popularity among studio professionals—testament to Fostex's enduring reputation for sonic integrity and engineering excellence.
See all Fostex listings on RADAR.
