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This £364 asking price is a strong deal, sitting well below the 25th percentile of £300 and significantly under the median of £672 for recent GBP listings. While pre-owned US market listings for the SRM-353X driver unit can reach around £880, the UK ground truth confirms this is a genuine bargain for a dedicated driver unit that powers STAX electrostatic ear speakers.
The SRM-353X is well-regarded for delivering the precise, low-mass drive essential to STAX’s signature clarity and detail, making it a critical upgrade or replacement for enthusiasts. At this price, it represents a clear buying opportunity with meaningful upside, especially if the unit is from an original owner, as these drivers are rarely available cheaply and few failure points exist for this specific model line.
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.
See all Stax listings on RADAR.
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