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About this gear
The Fostex HPA4 is a dedicated headphone amplifier released in 2017, designed to pair with external DACs and optimize the performance of high-impedance and planar magnetic headphones. Priced at $399, it targets headphone enthusiasts and Fostex's own T50RP modding community seeking clean amplification without integrated conversion.
About Fostex
Japanese professional audio company, a division of Foster Electric, manufacturing transducers since 1949. Fostex produces acclaimed planar magnetic headphones (T50RP series — the most modded headphone in history) alongside studio monitors and professional audio equipment. The TH900 with its urushi-l...
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