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€800 is an ambitious ask: it sits well above the €370 75th-percentile comparable and more than triples the €260 median.
The FS21RP is a distinctive, highly regarded planar/isodynamic midrange driver, valued for speed, transparency, and unusually low coloration when properly integrated. That makes a clean, complete pair interesting to DIY builders or collectors, especially if the diaphragms, magnets, frames, and terminals are untouched. At this price, though, rarity alone is not enough: confirm that it is a matched, working pair and establish exactly what is included. Unless these are exceptionally well-preserved or part of a documented, finished design, €800 looks more like collector pricing than a compelling used-market buy.
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.
eBay Australia
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DE
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Fair
audio-markt.de
Good
DE
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Good
DE
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Excellent
