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STAX SRM-D50 Electrostatic Headphone Amplifier / DAC

The SRM-D50 offers a complete electrostatic experience to plug-and-play on any desktop or audio rack. All you need is a USB or Coax digital audio connection, and you are good to go, for the first time ever from STAX! The amplifier section is quite powerful, and we think it performs a bit better than the SRM-353X.

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SRM-D50 drives STAX ‘s electrostatic earspeaker in an ideal form.
With the installation of a high-performance DAC, it supports various audio sources such as audio player and PC.

Supports various audio sources such as USB / optical / coaxial digital input, RCA analog input etc.
ESS DAC chip supports files with audio signal maximum DSD 5.6 MHz, PCM 384 KHz.
Adopt R core power transformer with less leakage flux.
Displays the strength of input signal with VU meter.
Adopted 4 mm thick nonmagnetic aluminum cover.


Frequency Response DC-40KHz
Input Impedance (RCA) 20kOhm
Maximum Output Voltage 400Vrms
Power Supply Voltage 14VDC
Power Consumption 35W
Dimensions 268mm x 192mm x 67mm
Weight 4.5 kg

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.