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STAX SRM-270S Electrostatic Driver Unit

Just announced! Pre-order now for immediate shipping on release, arriving end of May.

Updated May 8, 2024

The STAX SRM-270S is the newest earspeaker driver unit from the leader in electrostatic earpeakers and the easiest way for audiophiles to experience pure and immersive sound.

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Enhanced Heat Dissipation

A 3mm-thick front aluminum panel and a larger aluminium extrusion case for effective heat management.

High-Grade Connectivity

RCA pin jacks and a 3mm-thick front aluminum panel ensure a pristine connection.

Low Noise FET

Selected for the First Stage amplifier, paired with a refined emitter follower circuit in the Output Stage for unparalleled clarity.

Compact Chassis

Easy for placement, transportability and aesthetic appeal.


● Frequency Response: DC to 35,000Hz/+0, -3dB
● Harmonic Distortion: 0.01% or less/1kHz 100V r.m.s.
● Amplification: 58dB (800 times)
● Maximum Output Voltage: 280V r.m.s./1kHz
● Input Impedance: 25kΩ
● Input Terminals: RCA x 1
● Output Terminals: Parallel Out x 1
● Bias voltage: 580V, DC
● Power Supply: AC adaptor included
● External Dimensions:132(W)×38(H)×153(D)mm (excluding protruding parts)
● Weight: 540g

About STAX

STAX produce exclusively electrostatic headphones, or “earspeakers” as they call them, in Japan, since 1938. STAX chose the electrostatic technology for its ability to produce transparent sound, and low weight for comfort/ergonomics, both due to the driver design not employing fixed magnets and moving coils, as opposed to other common headphone driver designs. The minimal weight of the driver ensures a very quick response to the signal, creating a more faithful sound reproduction.