• Free 1 or 2 Day shipping for most US orders >$299


STAX SRM-700S Electrostatic Headphone Amplifier

The SRM-700S 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.

1 item left

Authorized Retailer

Free 1 or 2 Day

60-Day Returns

Ships in
North America

A STAX First

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.


• All-stage FET Configuration DC amplification

• Custom-Made Low Noise Dual FETs

• RCA input terminals

• XLR 3-pin input terminals

• RCA parallel output terminals

• 46W Power Consumption

Technical Specs

Frequency Response :DC – 100kHz (with one SR-009S)

Harmonic Distortion :0.01% or less (1kHz/100Vrms output)

Imput Impedence:50kΩ (RCA), 50kΩx 2 (XLR)


Maximum output voltage :450Vrms (1kHz)

Bias Voltage :PRO 580V

Operating Conditions :32 to 95 degrees fahrenheit @<90% humidity

Dimensions :240W x 103 H x 393 D mm

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.