STAX SRM-700S

Reference electrostatic headphone amplifier with fully discrete FET design

The STAX SRM-700S is one of the most uncompromising solid-state electrostatic driver amplifiers STAX has ever created. Designed for the legendary electrostatic Earspeakers from the iconic Japanese manufacturer, the SRM-700S combines exceptional resolution with outstanding speed, control, and transparency.

Unlike many traditional electrostatic amplifiers, the SRM-700S features a fully discrete semiconductor architecture using carefully selected dual-FETs and J-FETs throughout the signal path. The result is an exceptionally low-noise and highly precise presentation capable of revealing the finest details, spatial depth, and microdynamics effortlessly, without sounding clinical or sterile.

Thanks to its enormous bandwidth and high output voltage capability, the SRM-700S drives even the most demanding STAX models such as the SR-009S or SR-X9000 with impressive authority and ease. At the same time, it preserves the characteristic electrostatic speed, openness, and airiness that STAX has been famous for for decades.

Its solid aluminum construction, carefully selected components, and heavily shielded volume control highlight the amplifier’s uncompromising high-end philosophy. With both balanced XLR and single-ended RCA inputs, the SRM-700S integrates effortlessly into premium desktop and reference audio systems.

Sonically, the SRM-700S stands for exceptional neutrality, precision, and control — ideal for listeners who want to unlock the full technical potential of modern STAX Earspeakers.

Technical Specifications