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US$849 is a genuine bargain, sitting well below the 25th percentile of US$401 in the used market. Based on 50 recent comparable USD listings, the median asking price is US$900, with the 75th percentile at US$1,628, meaning this unit is priced nearly US$100 under the median and significantly cheaper than typical high-end resale values.
The SRM-500T is Stax’s entry-level hybrid tube driver, combining FET input with 6FQ7/6CG7 vacuum tube output to deliver warm yet precise electrostatic headphone amplification. It excels in midrange richness and smooth highs, making it a top pick for SR-L500MK2 or SR-009S owners seeking tube character without the cost of the SRM-700T. At US$849, this is a clear buying opportunity for anyone entering the Stax ecosystem or upgrading from solid-state drivers.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Stax traces its origins to 1938 in Tokyo, Japan, when Naotake Hayashi founded Showa Kouon Co., Ltd. in Chiyoda-ku. Initially focused on wax disc recording, metal master production, and audio equipment for film soundtracks, the company evolved through the postwar era. In 1950, it launched its first high-frequency condenser microphone, adopted by NHK, and renamed itself STAX Co., Ltd. in 1963, honoring its pioneering Stax-1 mic. A brief suspension in 1995 due to economic pressures gave way to revival, preserving its legacy under family leadership.
The brand specializes in electrostatic headphones, known as "EARSPEAKERS," debuting with the world-first SR-1 in 1960. This innovation spawned enduring lines like the SR series, produced for decades with incremental refinements for superior resolution and staging. Stax complements these with dedicated electrostatic amplifiers and select accessories, eschewing conventional speakers, turntables, DACs, or cables to hone its transducer expertise.
Stax commands a niche high-end position among audiophiles and professionals, revered for unmatched transparency and fidelity that rivals cost-no-object loudspeakers. Its 85-year heritage cements it as a boutique icon in electrostatic technology, far from mass-market fare, appealing to discerning buyers seeking pinnacle sonic transduction.
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