Stax SRM-353X

Driver Unit for Earspeakers

In stock

Incl. 19% Tax, excl. Shipping Cost

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The SRM-353X is the exclusive driver unit (amplifier) produced in order to drive STAX electrostatic type Earspeakers much more ideally.

Carefully selected high-quality parts of an audio grade further improved the tone quality, and re-examination of circuit details realized much wider frequency response. XLR input terminal provided enables to connect to the balanced output of audio equipment taking advantage of its superior performance.



  • Original low-noise dual FET at first stage as well as all-stage direct coupling class-A DC amplifier configuration with no coupling capacitor has realized natural tone quality with much amount of information.
  • Further improved emitter follower at output stage has enabled wide-range reproduction resulting in both the extended dynamic range at high frequency and the improved tone quality.
  • In addition to RCA input terminal, XLR balanced input terminal is provided to connect to wide range of audio equipment.
  • Custom-made 2-axis 4-gang volume controller is employed.
  • Extravagant non-magnetic aluminium alloy chassis of STAX tradition is adopted.
  • Components with little aging characteristics are selected carefully in consideration of tone quality and performance.


Daniel Dimitrov
Daniel Dimitrov

We have a comprehensive selection of Stax devices available for demonstration in our Headphone studios in Berlin-Kreuzberg. We look forward to your visit!

Frequency Response: DC - 90kHz (when used with one SR-L series Earspeaker)

Rated Input Level: 100mV (at 100V Output)

Gain: 60dB

Harmonic Distortion: Max 0.01% (with one SR-L500 at 100V r.m.s./1kHz output)

Input Impedance: 50KΩ (RCA) / 50KΩ x 2 (XLR)

Input Terminal: RCA x 1 or XLR x 1 (alternative)

Max. Output Voltage: 400V r.m.s. (1kHz)

Standard Bias Voltage: DC580V

Mains Voltage: Different depending on the area

Power Consumption: 30W

Operating temperature & humidity: 0 to 35ºC / 90% max. without condensation

Dimensions: 150 (W) x 100 (H) x 360 (D) mm (protruding portion included)

Weight: 3,0 kg

Others: input-bypassing parallel output (RCA)

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