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STAX SRM-700S Driver Unit for Electrostatic Earspeakers

All semiconductor driver unit that has adopted custom-made low-noise dual FET at the first stage, and for the first time in STAX driver unit history J-FET has been employed at the second stage. The output of J-FET excellent in low-noise amplification, as well as large current emitter follower circuit, brings out the full performance of earspeakers. Even the music source with many high-frequency ingredients can easily be driven. The driver unit pursues an exact reproduction of musical details.


  • TypeAll-stage FET configuration DC amplification driver unit
  • Frequency responseDC - 100kHz (with one SR-009S)
  • Gain60dB
  • Harmonic distortion0.01% or less (1kHz/100Vrms output)
  • Input impedance50kΩ (RCA), 50kΩx 2 (XLR)
  • Maximum output voltage450Vrms (1kHz)
  • Bias voltagePRO 580V
  • Operating temperature / humidity0 to 35 degrees C / less than 90% (non condensing)
  • Input terminalRCA x 1, XLR x 1
  • OutputRCA parallel output terminal
  • Power consumption46W
  • Dimension240W x 103H x 393D mm (maximum protruding portion included) 
  • Weight6.3kg

Backed with a 1-year STAX warranty

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Delivery Information

As a company our primary goal is to provide a seamless service that results in customer satisfaction. We aim to deliver within 3 working days. Unfortunately, there may be occasions where this time frame may not be met due to unforeseen circumstances; in this instance, we deliver product/s as soon as we can. All delivery charges are included within the prices quoted, unless otherwise specified.

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