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 much high-frequency ingredients can easily be driven.

The driver unit pursues an exact reproduction of musical details.



  • Type: All-stage FET configuration DC amplification driver unit
  • Frequency response: DC - 100kHz (with one SR-009S)
  • Gain: 60dB
  • Harmonic distortion: 0.01% or less (1kHz/100Vrms output)
  • Input impedance: 50kohm (RCA), 50k x 2 (XLR)
  • Maximum output voltage: 450Vrms (1kHz)
  • Bias voltage: PRO 580V
  • Operating temperature / humidity: 0 to 35 degrees C / less than 90% (non condensing)
  • Input terminal: RCA x 1, XLR x 1
  • Output: RCA parallel output terminal
  • Power consumption: 46W
  • Dimension: 240 (W) x 103 (H) x 393 (D) mm (maximum protruding portion included)
  • Weight: 6.3kg

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