Stax T700S Energizer
Stax T700S Energizer
Stax T700S Energizer
Stax T700S Energizer

SRM-T700S Solid State Energizer

The newly designed SRM-700S is a solid state electrostatic headphone driver. Inspired by the flagship model SRM-T8000.

2 Years




The 700S is an 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 T700S has new semiconductor driver with J-FET in the amplification stage. The custom-made, low-noise dual FET is low-noise and features switchable RCA and XLR inputs. RCA parallel out and bypass volume control switching.

The newly developed large-sized aluminium insulator combined with new vibration-proof material and high frictional coefficient (grip power) have been employed.

Like the successful T8000 energizer, the T700 features a new updated look which brings Stax into the modern world in terms of styling.

Please note that this device can only drive STAX’s electrostatic earspeakers

All-stage FET configuration DC amplification driver unit

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


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

RCA parallel output terminal

Power consumption

240W x 103 H x 393 D mm (maximum protruding portion included)