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STAX SRM-700S Electrostatic Headphone Amplifier

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● New semiconductor driver with J-FET in the amplification stage
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.

● The power transistor array with effective heat dissipation through large-sized heat sink

● Strictly selected pair-matched special FET.

● High-definition film capacitor made by German WIMA is used.

● Level control switch that can bypass the volume of the unit.

● As with SRM-T8000, a shield case is used for the volume device.

● RCA and XLR inputs are switchable. RCA input supports parallel out.

● The newly developed large-sized aluminum insulator combined with new vibration-proof material and high frictional coefficient (grip power) has been employed. The friction power is so high that you almost need not hold the unit when inserting the plug of your earspeaker.


● 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: 50kΩ (RCA), 50kΩx 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: 240W x 103 H x 393 D mm (maximum protruding portion included)
● Weight: 6.3kg

About STAX

STAX produce exclusively electrostatic headphones, or “earspeakers” as they call them, in Japan, since 1938. STAX chose the electrostatic technology for its ability to produce transparent sound, and low weight for comfort/ergonomics, both due to the driver design not employing fixed magnets and moving coils, as opposed to other common headphone driver designs. The minimal weight of the driver ensures a very quick response to the signal, creating a more faithful sound reproduction.