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.

"Stax SRM-700S driver unit is all JFET, and it is so transparent I swear that in the quiet passages I could hear its JFETs flowing current. Which suggests the 700S is a simple, naturally clean design with minimal feedback.

Listening to Serge Gainsbourg's Histoire de Melody Nelson, my attention kept focusing on how Serge and Jane Birkin pronounced their words. With the 700S powering the 007S, each word had its own shape and internal structure.” - Herb Reichert

SPECIFICATIONS SRM-700S

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 103H x 393D mm (maximum protruding portion included)

Weight : 6.3 kg

Origin : Made in Japan