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Commercial Stax SRM-D50 Headphone Amplifier Discover the Stax SRM-D50 Electrostatic Headphone Amplifier at Len Wallis Audio. Elevate your audio experience with this premium pre-owned headphone amplifier. Key Features High-Performance DAC: ESS ES9018 chip supports PCM 32/384 kHz and DSD 5.6 for high-resolution audio. Versatile Connectivity: USB, optical, coaxial digital, and RCA analogue inputs. Electrostatic Driver: Delivers legendary Stax sound with 580V DC bias. Retro VU Meter: Displays input strength for a classic aesthetic. Inspired by the portable SRM-D10, the Stax SRM-D50 offers an
At A$1,400, this Stax SRM-D50 is a strong bargain compared to the typical used market, where recent sales show units clearing around A$1,050–A$1,150 (converted from ~US$700–US$770) and new retail sitting at A$1,999. You’re getting a modern, compact electrostatic driver with built-in DAC for roughly 30% below new and well below the median used price, making this an excellent entry into Stax’s electrostatic system.
The SRM-D50 is well-regarded for its solid-state reliability, clean 400Vr.m.s output, and versatile digital inputs (USB, TOS, COAX) that eliminate the need for a separate DAC. It pairs cleanly with SR-L series earspeakers and delivers low distortion (0.025%) across the full audio band. At this price, even with unknown condition, the upside is significant: it’s a rare find in the used market, and if it’s from a clean original owner with accessories, it’s a clear buying opportunity to join the Stax ecosystem without paying full retail.
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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