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Premium Japanese-made closed-back headphones renowned for their detailed, dynamic and engaging sound. Features Fostex’s 50mm Biodyna drivers, Urushi lacquered Japanese Cherry Birch housings and detachable 7N-OFC cable. 25Ω impedance makes them easy to drive, while the closed-back desi...
This is a seller’s market at A$950: against your AUD comps, it sits well above the A$730 75th percentile and nearly double the A$509 median, so it reads ambitious rather than a bargain. It’s not absurd for a TH900, but it’s priced for a clean, desirable example with little room for negotiation.
The TH900 is still a standout closed-back for impact, speed, and big, vivid soundstage, with the biodyna driver giving it that punchy, lively presentation collectors like. At this level, though, buyers should want strong cosmetics, original pads/cable, and proof it hasn’t been abused; if it’s pristine and complete, it’s a nice headphone, but the price leaves little upside unless the condition is exceptional.
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.
