Stax SRM-700S Electrostatic Headphone Amplifier

New semiconductor driver with J-FET in the amplification stageAll 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. 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 termin