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SRM-353X Driver unit for Earspeakers
SRM-353X Driver unit for Earspeakers
SRM-353X Driver unit for Earspeakers
SRM-353X Driver unit for Earspeakers

SRM-353X Driver unit for Earspeakers

Regular price $925.00 Sale

The STAX SRM-353X is an exclusive driver unit (amplifier) from STAX. This driver unit reproduces sound over a wide range of frequencies and gives you audio that sounds natural thanks to the FET and improved emitter.

The STAX SRM-353X also looks good. Each component is handpicked to ensure that it does not age. At the same time, the non-magnetic aluminium alloy chassis lets you show off this driver unit to everyone.

Please note that this device can only drive STAX’s electrostatic earspeakers.


  • 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 aluminum alloy chassis of STAX tradition is adopted.
    ●Components with little aging characteristics are selected carefully in consideration of tone quality and performance.


  • Type: All-stage semiconductors, Low-noise dual FET input Class A operation, Pure balance DC amplifier configuration Earspeaker driver unit
  • Frequency Response: DC to 90,000Hz (with 1 SR-L series Earspeaker) High Harmonic Distortion: Max 0.01% (1kHz at 100V r.m.s. with SR-L500)
  • Gain: 60dB (x1000) 
  • Input Terminal: 1 RCA with 1 RCA parallel out and XLR 
  • Rated Input Level: 100mV / 100V Outputs 
  • Max. Input Level: 30V (at minimum volume level) 
  • Input Impedance: 50KΩ(RCA) 50KΩx2(XLR) 
  • Max. Output Voltage: 400V r.m.s. (1kHz) 
  • Standard Bias Voltage: PRO 580V x 2 
  • Power Voltage Frequency: 117V (50Hz / 60Hz) 
  • Power Consumption: 30W 
  • Temperature & Humidity: 0 to 35ºC / 90% max. without condensation 
  • Dimensions: 5.9 (W) x 3.9 (H) x 14.2 (D) in 
  • Weight: 3kg
  • Colour: Silver