STAX SRM-700S Semiconductor Type High-End Electrostatic Driver

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Released October 2020, the newly designed SRM-700S is an electrostatic headphone driver from STAX Audio, which utilises fully discrete dual FET circuitry.

The output of the J-FET and the large current emitter follower circuit are low noise, meaning that accurate music reproduction is delivered without missing any of the fine details. The amplification stage has a new semiconductor driver with J-FET, whilst the custom-made, dual FET is also incredibly low-noise.

Perfect for STAX electrostatic earspeakers, allowing the precise detail of your music to shine through.


  • Power transistor array features effective heat dissipation via large-sized heat sink
  • High-definition film capacitors
  • Hand-selected matching FET
  • EMI shielded volume control
  • Volume control bypass switching
  • Switchable RCA and XLR inputs. RCA parallel out.
  • Features newly developed large-sized aluminium insulators, combined with new vibration-proof material plus high frictional coefficient.
More Information
Free warranty 3 years
Delivery Charge Free
Delivery Time Normally 1 - 5 Working Days (Covid-19 and Brexit Delays Possible, contact us for more information)
Card Surcharge No
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  • Type: All-stage FET configuration DC amplification driver unit
  • Frequency response: DC – 100 kHz (with SR-009S)
  • Gain: 60dB
  • Harmonic distortion: 0.01% or less (1 kHz / 100 V rms output)
  • Input impedance: 50 kΩ (RCA), 50 kΩx 2 (XLR)
  • Maximum output voltage: 450 V rms (1 kHz)
  • Bias voltage: PRO 580 V
  • 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: 46 W
  • Dimension: 240 W x 103 H x 393 D mm (maximum protruding portion included)
  • Weight: 6.3 kg