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

£2,895.00 inc. VAT

Trade-in available.

The SRM-700S by STAX Audio is an electrostatic headphone driver utilizing a fully discrete dual FET.

The output of the J-FET and the large current emitter follower circuit are low noise. Accurate music reproduction is realized without missing any fine details.

Available in Silver or Black finish.



* Usually ships within 1-3 business days. See exceptions

SKU: USV-STAX-SRM700S Categories: , , Tag:



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.

Update, March 2022: The STAX SRM-700S is now also available in Black finish. We are awaiting images of this new casing.


  • 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.


  • Type: All-stage FET configuration DC amplification driver unit
  • Frequency response: DC – 100 kHz (with SR-009S)
  • Gain: 60 dB
  • 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

Full STAX Range Available

Unilet Sound & Vision are official retail partners for STAX Audio, providing sales, advice and assistance on their entire range of high-quality products. Please do get in touch if you would like a demonstration or wish to purchase.

More Information

Additional information

Weight 6.3 kg
Dimensions 39.3 × 24.0 × 10.3 cm

Black, Silver

Purchase Options

Home Delivery, Click & Collect, Trade-In Available



Founded in 1938, STAX brought the world's first electrostatic headphone to market in 1960. Today they continue their long tradition by offering the finest audio products for both professional and audiophile applications.

All STAX headphones are referred to as "earspeakers" - the company states that such ultra-high fidelity devices can only be compared with the best cost-no-object loudspeakers, not other headphones. Their unique amplifiers, earspeakers and drivers are highly sought-after products, and extremely well considered by aficionados in the audio industry.

Unilet Sound & Vision are one of the oldest STAX dealers in the UK, and one of the very few official outlets stocking their products. Do get in touch with us if you would like to audition the range, or need advice or assistance with choosing the right system for your needs.

STAX | Unilet Sound & Vision


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